root / fpu / softfloat-specialize.h @ 067404be
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1 | 8d725fac | Andreas Färber | /*
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2 | 8d725fac | Andreas Färber | * QEMU float support
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3 | 8d725fac | Andreas Färber | *
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4 | 8d725fac | Andreas Färber | * Derived from SoftFloat.
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5 | 8d725fac | Andreas Färber | */
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6 | 158142c2 | bellard | |
7 | 158142c2 | bellard | /*============================================================================
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8 | 158142c2 | bellard | |
9 | 158142c2 | bellard | This C source fragment is part of the SoftFloat IEC/IEEE Floating-point
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10 | 158142c2 | bellard | Arithmetic Package, Release 2b.
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11 | 158142c2 | bellard | |
12 | 158142c2 | bellard | Written by John R. Hauser. This work was made possible in part by the
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13 | 158142c2 | bellard | International Computer Science Institute, located at Suite 600, 1947 Center
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14 | 158142c2 | bellard | Street, Berkeley, California 94704. Funding was partially provided by the
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15 | 158142c2 | bellard | National Science Foundation under grant MIP-9311980. The original version
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16 | 158142c2 | bellard | of this code was written as part of a project to build a fixed-point vector
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17 | 158142c2 | bellard | processor in collaboration with the University of California at Berkeley,
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18 | 158142c2 | bellard | overseen by Profs. Nelson Morgan and John Wawrzynek. More information
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19 | 158142c2 | bellard | is available through the Web page `http://www.cs.berkeley.edu/~jhauser/
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20 | 158142c2 | bellard | arithmetic/SoftFloat.html'.
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21 | 158142c2 | bellard | |
22 | 158142c2 | bellard | THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort has
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23 | 158142c2 | bellard | been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES
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24 | 158142c2 | bellard | RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS
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25 | 158142c2 | bellard | AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ALL LOSSES,
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26 | 158142c2 | bellard | COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
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27 | 158142c2 | bellard | EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
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28 | 158142c2 | bellard | INSTITUTE (possibly via similar legal warning) AGAINST ALL LOSSES, COSTS, OR
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29 | 158142c2 | bellard | OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.
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30 | 158142c2 | bellard | |
31 | 158142c2 | bellard | Derivative works are acceptable, even for commercial purposes, so long as
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32 | 158142c2 | bellard | (1) the source code for the derivative work includes prominent notice that
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33 | 158142c2 | bellard | the work is derivative, and (2) the source code includes prominent notice with
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34 | 158142c2 | bellard | these four paragraphs for those parts of this code that are retained.
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35 | 158142c2 | bellard | |
36 | 158142c2 | bellard | =============================================================================*/
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37 | 158142c2 | bellard | |
38 | 789ec7ce | Paolo Bonzini | #if defined(TARGET_MIPS) || defined(TARGET_SH4) || defined(TARGET_UNICORE32)
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39 | 789ec7ce | Paolo Bonzini | #define SNAN_BIT_IS_ONE 1 |
40 | 789ec7ce | Paolo Bonzini | #else
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41 | 789ec7ce | Paolo Bonzini | #define SNAN_BIT_IS_ONE 0 |
42 | 789ec7ce | Paolo Bonzini | #endif
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43 | 789ec7ce | Paolo Bonzini | |
44 | 213ff4e6 | Max Filippov | #if defined(TARGET_XTENSA)
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45 | 213ff4e6 | Max Filippov | /* Define for architectures which deviate from IEEE in not supporting
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46 | 213ff4e6 | Max Filippov | * signaling NaNs (so all NaNs are treated as quiet).
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47 | 213ff4e6 | Max Filippov | */
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48 | 213ff4e6 | Max Filippov | #define NO_SIGNALING_NANS 1 |
49 | 213ff4e6 | Max Filippov | #endif
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50 | 213ff4e6 | Max Filippov | |
51 | 789ec7ce | Paolo Bonzini | /*----------------------------------------------------------------------------
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52 | 789ec7ce | Paolo Bonzini | | The pattern for a default generated half-precision NaN.
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53 | 789ec7ce | Paolo Bonzini | *----------------------------------------------------------------------------*/
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54 | 789ec7ce | Paolo Bonzini | #if defined(TARGET_ARM)
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55 | 789ec7ce | Paolo Bonzini | const float16 float16_default_nan = const_float16(0x7E00); |
56 | 789ec7ce | Paolo Bonzini | #elif SNAN_BIT_IS_ONE
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57 | 789ec7ce | Paolo Bonzini | const float16 float16_default_nan = const_float16(0x7DFF); |
58 | 789ec7ce | Paolo Bonzini | #else
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59 | 789ec7ce | Paolo Bonzini | const float16 float16_default_nan = const_float16(0xFE00); |
60 | 789ec7ce | Paolo Bonzini | #endif
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61 | 789ec7ce | Paolo Bonzini | |
62 | 789ec7ce | Paolo Bonzini | /*----------------------------------------------------------------------------
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63 | 789ec7ce | Paolo Bonzini | | The pattern for a default generated single-precision NaN.
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64 | 789ec7ce | Paolo Bonzini | *----------------------------------------------------------------------------*/
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65 | 789ec7ce | Paolo Bonzini | #if defined(TARGET_SPARC)
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66 | 789ec7ce | Paolo Bonzini | const float32 float32_default_nan = const_float32(0x7FFFFFFF); |
67 | b81fe822 | Max Filippov | #elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA) || \
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68 | b81fe822 | Max Filippov | defined(TARGET_XTENSA) |
69 | 789ec7ce | Paolo Bonzini | const float32 float32_default_nan = const_float32(0x7FC00000); |
70 | 789ec7ce | Paolo Bonzini | #elif SNAN_BIT_IS_ONE
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71 | 789ec7ce | Paolo Bonzini | const float32 float32_default_nan = const_float32(0x7FBFFFFF); |
72 | 789ec7ce | Paolo Bonzini | #else
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73 | 789ec7ce | Paolo Bonzini | const float32 float32_default_nan = const_float32(0xFFC00000); |
74 | 789ec7ce | Paolo Bonzini | #endif
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75 | 789ec7ce | Paolo Bonzini | |
76 | 789ec7ce | Paolo Bonzini | /*----------------------------------------------------------------------------
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77 | 789ec7ce | Paolo Bonzini | | The pattern for a default generated double-precision NaN.
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78 | 789ec7ce | Paolo Bonzini | *----------------------------------------------------------------------------*/
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79 | 789ec7ce | Paolo Bonzini | #if defined(TARGET_SPARC)
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80 | 789ec7ce | Paolo Bonzini | const float64 float64_default_nan = const_float64(LIT64( 0x7FFFFFFFFFFFFFFF )); |
81 | 789ec7ce | Paolo Bonzini | #elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA)
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82 | 789ec7ce | Paolo Bonzini | const float64 float64_default_nan = const_float64(LIT64( 0x7FF8000000000000 )); |
83 | 789ec7ce | Paolo Bonzini | #elif SNAN_BIT_IS_ONE
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84 | 789ec7ce | Paolo Bonzini | const float64 float64_default_nan = const_float64(LIT64( 0x7FF7FFFFFFFFFFFF )); |
85 | 789ec7ce | Paolo Bonzini | #else
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86 | 789ec7ce | Paolo Bonzini | const float64 float64_default_nan = const_float64(LIT64( 0xFFF8000000000000 )); |
87 | 789ec7ce | Paolo Bonzini | #endif
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88 | 789ec7ce | Paolo Bonzini | |
89 | 789ec7ce | Paolo Bonzini | /*----------------------------------------------------------------------------
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90 | 789ec7ce | Paolo Bonzini | | The pattern for a default generated extended double-precision NaN.
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91 | 789ec7ce | Paolo Bonzini | *----------------------------------------------------------------------------*/
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92 | 789ec7ce | Paolo Bonzini | #if SNAN_BIT_IS_ONE
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93 | 789ec7ce | Paolo Bonzini | #define floatx80_default_nan_high 0x7FFF |
94 | 789ec7ce | Paolo Bonzini | #define floatx80_default_nan_low LIT64( 0xBFFFFFFFFFFFFFFF ) |
95 | 789ec7ce | Paolo Bonzini | #else
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96 | 789ec7ce | Paolo Bonzini | #define floatx80_default_nan_high 0xFFFF |
97 | 789ec7ce | Paolo Bonzini | #define floatx80_default_nan_low LIT64( 0xC000000000000000 ) |
98 | 789ec7ce | Paolo Bonzini | #endif
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99 | 789ec7ce | Paolo Bonzini | |
100 | 3bf7e40a | Avi Kivity | const floatx80 floatx80_default_nan
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101 | 3bf7e40a | Avi Kivity | = make_floatx80_init(floatx80_default_nan_high, floatx80_default_nan_low); |
102 | 789ec7ce | Paolo Bonzini | |
103 | 789ec7ce | Paolo Bonzini | /*----------------------------------------------------------------------------
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104 | 789ec7ce | Paolo Bonzini | | The pattern for a default generated quadruple-precision NaN. The `high' and
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105 | 789ec7ce | Paolo Bonzini | | `low' values hold the most- and least-significant bits, respectively.
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106 | 789ec7ce | Paolo Bonzini | *----------------------------------------------------------------------------*/
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107 | 789ec7ce | Paolo Bonzini | #if SNAN_BIT_IS_ONE
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108 | 789ec7ce | Paolo Bonzini | #define float128_default_nan_high LIT64( 0x7FFF7FFFFFFFFFFF ) |
109 | 789ec7ce | Paolo Bonzini | #define float128_default_nan_low LIT64( 0xFFFFFFFFFFFFFFFF ) |
110 | 789ec7ce | Paolo Bonzini | #else
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111 | 789ec7ce | Paolo Bonzini | #define float128_default_nan_high LIT64( 0xFFFF800000000000 ) |
112 | 789ec7ce | Paolo Bonzini | #define float128_default_nan_low LIT64( 0x0000000000000000 ) |
113 | 789ec7ce | Paolo Bonzini | #endif
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114 | 789ec7ce | Paolo Bonzini | |
115 | 3bf7e40a | Avi Kivity | const float128 float128_default_nan
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116 | 3bf7e40a | Avi Kivity | = make_float128_init(float128_default_nan_high, float128_default_nan_low); |
117 | 789ec7ce | Paolo Bonzini | |
118 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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119 | 158142c2 | bellard | | Raises the exceptions specified by `flags'. Floating-point traps can be
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120 | 158142c2 | bellard | | defined here if desired. It is currently not possible for such a trap
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121 | 158142c2 | bellard | | to substitute a result value. If traps are not implemented, this routine
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122 | 158142c2 | bellard | | should be simply `float_exception_flags |= flags;'.
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123 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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124 | 158142c2 | bellard | |
125 | 158142c2 | bellard | void float_raise( int8 flags STATUS_PARAM )
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126 | 158142c2 | bellard | { |
127 | 158142c2 | bellard | STATUS(float_exception_flags) |= flags; |
128 | 158142c2 | bellard | } |
129 | 158142c2 | bellard | |
130 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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131 | 158142c2 | bellard | | Internal canonical NaN format.
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132 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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133 | 158142c2 | bellard | typedef struct { |
134 | 158142c2 | bellard | flag sign; |
135 | bb98fe42 | Andreas Färber | uint64_t high, low; |
136 | 158142c2 | bellard | } commonNaNT; |
137 | 158142c2 | bellard | |
138 | 213ff4e6 | Max Filippov | #ifdef NO_SIGNALING_NANS
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139 | 213ff4e6 | Max Filippov | int float16_is_quiet_nan(float16 a_)
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140 | 213ff4e6 | Max Filippov | { |
141 | 213ff4e6 | Max Filippov | return float16_is_any_nan(a_);
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142 | 213ff4e6 | Max Filippov | } |
143 | 213ff4e6 | Max Filippov | |
144 | 213ff4e6 | Max Filippov | int float16_is_signaling_nan(float16 a_)
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145 | 213ff4e6 | Max Filippov | { |
146 | 213ff4e6 | Max Filippov | return 0; |
147 | 213ff4e6 | Max Filippov | } |
148 | 213ff4e6 | Max Filippov | #else
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149 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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150 | bb4d4bb3 | Peter Maydell | | Returns 1 if the half-precision floating-point value `a' is a quiet
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151 | bb4d4bb3 | Peter Maydell | | NaN; otherwise returns 0.
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152 | bb4d4bb3 | Peter Maydell | *----------------------------------------------------------------------------*/
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153 | bb4d4bb3 | Peter Maydell | |
154 | bb4d4bb3 | Peter Maydell | int float16_is_quiet_nan(float16 a_)
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155 | bb4d4bb3 | Peter Maydell | { |
156 | bb4d4bb3 | Peter Maydell | uint16_t a = float16_val(a_); |
157 | bb4d4bb3 | Peter Maydell | #if SNAN_BIT_IS_ONE
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158 | bb4d4bb3 | Peter Maydell | return (((a >> 9) & 0x3F) == 0x3E) && (a & 0x1FF); |
159 | bb4d4bb3 | Peter Maydell | #else
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160 | bb4d4bb3 | Peter Maydell | return ((a & ~0x8000) >= 0x7c80); |
161 | bb4d4bb3 | Peter Maydell | #endif
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162 | bb4d4bb3 | Peter Maydell | } |
163 | bb4d4bb3 | Peter Maydell | |
164 | bb4d4bb3 | Peter Maydell | /*----------------------------------------------------------------------------
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165 | bb4d4bb3 | Peter Maydell | | Returns 1 if the half-precision floating-point value `a' is a signaling
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166 | bb4d4bb3 | Peter Maydell | | NaN; otherwise returns 0.
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167 | bb4d4bb3 | Peter Maydell | *----------------------------------------------------------------------------*/
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168 | bb4d4bb3 | Peter Maydell | |
169 | bb4d4bb3 | Peter Maydell | int float16_is_signaling_nan(float16 a_)
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170 | bb4d4bb3 | Peter Maydell | { |
171 | bb4d4bb3 | Peter Maydell | uint16_t a = float16_val(a_); |
172 | bb4d4bb3 | Peter Maydell | #if SNAN_BIT_IS_ONE
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173 | bb4d4bb3 | Peter Maydell | return ((a & ~0x8000) >= 0x7c80); |
174 | bb4d4bb3 | Peter Maydell | #else
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175 | bb4d4bb3 | Peter Maydell | return (((a >> 9) & 0x3F) == 0x3E) && (a & 0x1FF); |
176 | bb4d4bb3 | Peter Maydell | #endif
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177 | bb4d4bb3 | Peter Maydell | } |
178 | 213ff4e6 | Max Filippov | #endif
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179 | bb4d4bb3 | Peter Maydell | |
180 | bb4d4bb3 | Peter Maydell | /*----------------------------------------------------------------------------
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181 | bb4d4bb3 | Peter Maydell | | Returns a quiet NaN if the half-precision floating point value `a' is a
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182 | bb4d4bb3 | Peter Maydell | | signaling NaN; otherwise returns `a'.
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183 | bb4d4bb3 | Peter Maydell | *----------------------------------------------------------------------------*/
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184 | bb4d4bb3 | Peter Maydell | float16 float16_maybe_silence_nan(float16 a_) |
185 | bb4d4bb3 | Peter Maydell | { |
186 | bb4d4bb3 | Peter Maydell | if (float16_is_signaling_nan(a_)) {
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187 | bb4d4bb3 | Peter Maydell | #if SNAN_BIT_IS_ONE
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188 | d2fbca94 | Guan Xuetao | # if defined(TARGET_MIPS) || defined(TARGET_SH4) || defined(TARGET_UNICORE32)
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189 | bb4d4bb3 | Peter Maydell | return float16_default_nan;
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190 | bb4d4bb3 | Peter Maydell | # else
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191 | bb4d4bb3 | Peter Maydell | # error Rules for silencing a signaling NaN are target-specific |
192 | bb4d4bb3 | Peter Maydell | # endif
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193 | bb4d4bb3 | Peter Maydell | #else
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194 | bb4d4bb3 | Peter Maydell | uint16_t a = float16_val(a_); |
195 | bb4d4bb3 | Peter Maydell | a |= (1 << 9); |
196 | bb4d4bb3 | Peter Maydell | return make_float16(a);
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197 | bb4d4bb3 | Peter Maydell | #endif
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198 | bb4d4bb3 | Peter Maydell | } |
199 | bb4d4bb3 | Peter Maydell | return a_;
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200 | bb4d4bb3 | Peter Maydell | } |
201 | bb4d4bb3 | Peter Maydell | |
202 | bb4d4bb3 | Peter Maydell | /*----------------------------------------------------------------------------
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203 | f591e1be | Peter Maydell | | Returns the result of converting the half-precision floating-point NaN
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204 | f591e1be | Peter Maydell | | `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid
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205 | f591e1be | Peter Maydell | | exception is raised.
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206 | f591e1be | Peter Maydell | *----------------------------------------------------------------------------*/
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207 | f591e1be | Peter Maydell | |
208 | f591e1be | Peter Maydell | static commonNaNT float16ToCommonNaN( float16 a STATUS_PARAM )
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209 | f591e1be | Peter Maydell | { |
210 | f591e1be | Peter Maydell | commonNaNT z; |
211 | f591e1be | Peter Maydell | |
212 | f591e1be | Peter Maydell | if ( float16_is_signaling_nan( a ) ) float_raise( float_flag_invalid STATUS_VAR );
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213 | f591e1be | Peter Maydell | z.sign = float16_val(a) >> 15;
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214 | f591e1be | Peter Maydell | z.low = 0;
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215 | bb98fe42 | Andreas Färber | z.high = ((uint64_t) float16_val(a))<<54;
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216 | f591e1be | Peter Maydell | return z;
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217 | f591e1be | Peter Maydell | } |
218 | f591e1be | Peter Maydell | |
219 | f591e1be | Peter Maydell | /*----------------------------------------------------------------------------
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220 | 600e30d2 | Peter Maydell | | Returns the result of converting the canonical NaN `a' to the half-
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221 | 600e30d2 | Peter Maydell | | precision floating-point format.
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222 | 600e30d2 | Peter Maydell | *----------------------------------------------------------------------------*/
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223 | 600e30d2 | Peter Maydell | |
224 | 600e30d2 | Peter Maydell | static float16 commonNaNToFloat16(commonNaNT a STATUS_PARAM)
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225 | 600e30d2 | Peter Maydell | { |
226 | 600e30d2 | Peter Maydell | uint16_t mantissa = a.high>>54;
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227 | 600e30d2 | Peter Maydell | |
228 | 600e30d2 | Peter Maydell | if (STATUS(default_nan_mode)) {
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229 | 600e30d2 | Peter Maydell | return float16_default_nan;
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230 | 600e30d2 | Peter Maydell | } |
231 | 600e30d2 | Peter Maydell | |
232 | 600e30d2 | Peter Maydell | if (mantissa) {
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233 | 600e30d2 | Peter Maydell | return make_float16(((((uint16_t) a.sign) << 15) |
234 | 600e30d2 | Peter Maydell | | (0x1F << 10) | mantissa)); |
235 | 600e30d2 | Peter Maydell | } else {
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236 | 600e30d2 | Peter Maydell | return float16_default_nan;
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237 | 600e30d2 | Peter Maydell | } |
238 | 600e30d2 | Peter Maydell | } |
239 | 600e30d2 | Peter Maydell | |
240 | 213ff4e6 | Max Filippov | #ifdef NO_SIGNALING_NANS
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241 | 213ff4e6 | Max Filippov | int float32_is_quiet_nan(float32 a_)
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242 | 213ff4e6 | Max Filippov | { |
243 | 213ff4e6 | Max Filippov | return float32_is_any_nan(a_);
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244 | 213ff4e6 | Max Filippov | } |
245 | 213ff4e6 | Max Filippov | |
246 | 213ff4e6 | Max Filippov | int float32_is_signaling_nan(float32 a_)
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247 | 213ff4e6 | Max Filippov | { |
248 | 213ff4e6 | Max Filippov | return 0; |
249 | 213ff4e6 | Max Filippov | } |
250 | 213ff4e6 | Max Filippov | #else
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251 | 600e30d2 | Peter Maydell | /*----------------------------------------------------------------------------
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252 | 5a6932d5 | ths | | Returns 1 if the single-precision floating-point value `a' is a quiet
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253 | 5a6932d5 | ths | | NaN; otherwise returns 0.
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254 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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255 | 158142c2 | bellard | |
256 | 18569871 | Peter Maydell | int float32_is_quiet_nan( float32 a_ )
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257 | 158142c2 | bellard | { |
258 | f090c9d4 | pbrook | uint32_t a = float32_val(a_); |
259 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
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260 | b645bb48 | ths | return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF ); |
261 | b645bb48 | ths | #else
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262 | bb98fe42 | Andreas Färber | return ( 0xFF800000 <= (uint32_t) ( a<<1 ) ); |
263 | b645bb48 | ths | #endif
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264 | 158142c2 | bellard | } |
265 | 158142c2 | bellard | |
266 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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267 | 158142c2 | bellard | | Returns 1 if the single-precision floating-point value `a' is a signaling
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268 | 158142c2 | bellard | | NaN; otherwise returns 0.
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269 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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270 | 158142c2 | bellard | |
271 | f090c9d4 | pbrook | int float32_is_signaling_nan( float32 a_ )
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272 | 158142c2 | bellard | { |
273 | f090c9d4 | pbrook | uint32_t a = float32_val(a_); |
274 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
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275 | bb98fe42 | Andreas Färber | return ( 0xFF800000 <= (uint32_t) ( a<<1 ) ); |
276 | b645bb48 | ths | #else
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277 | 158142c2 | bellard | return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF ); |
278 | b645bb48 | ths | #endif
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279 | 158142c2 | bellard | } |
280 | 213ff4e6 | Max Filippov | #endif
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281 | 158142c2 | bellard | |
282 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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283 | b408dbde | Peter Maydell | | Returns a quiet NaN if the single-precision floating point value `a' is a
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284 | b408dbde | Peter Maydell | | signaling NaN; otherwise returns `a'.
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285 | b408dbde | Peter Maydell | *----------------------------------------------------------------------------*/
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286 | b408dbde | Peter Maydell | |
287 | b408dbde | Peter Maydell | float32 float32_maybe_silence_nan( float32 a_ ) |
288 | b408dbde | Peter Maydell | { |
289 | b408dbde | Peter Maydell | if (float32_is_signaling_nan(a_)) {
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290 | b408dbde | Peter Maydell | #if SNAN_BIT_IS_ONE
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291 | d2fbca94 | Guan Xuetao | # if defined(TARGET_MIPS) || defined(TARGET_SH4) || defined(TARGET_UNICORE32)
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292 | 93ae1c6f | Aurelien Jarno | return float32_default_nan;
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293 | 93ae1c6f | Aurelien Jarno | # else
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294 | 93ae1c6f | Aurelien Jarno | # error Rules for silencing a signaling NaN are target-specific |
295 | 93ae1c6f | Aurelien Jarno | # endif
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296 | b408dbde | Peter Maydell | #else
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297 | bb98fe42 | Andreas Färber | uint32_t a = float32_val(a_); |
298 | b408dbde | Peter Maydell | a |= (1 << 22); |
299 | b408dbde | Peter Maydell | return make_float32(a);
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300 | 93ae1c6f | Aurelien Jarno | #endif
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301 | b408dbde | Peter Maydell | } |
302 | b408dbde | Peter Maydell | return a_;
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303 | b408dbde | Peter Maydell | } |
304 | b408dbde | Peter Maydell | |
305 | b408dbde | Peter Maydell | /*----------------------------------------------------------------------------
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306 | 158142c2 | bellard | | Returns the result of converting the single-precision floating-point NaN
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307 | 158142c2 | bellard | | `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid
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308 | 158142c2 | bellard | | exception is raised.
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309 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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310 | 158142c2 | bellard | |
311 | 158142c2 | bellard | static commonNaNT float32ToCommonNaN( float32 a STATUS_PARAM )
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312 | 158142c2 | bellard | { |
313 | 158142c2 | bellard | commonNaNT z; |
314 | 158142c2 | bellard | |
315 | 158142c2 | bellard | if ( float32_is_signaling_nan( a ) ) float_raise( float_flag_invalid STATUS_VAR );
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316 | f090c9d4 | pbrook | z.sign = float32_val(a)>>31;
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317 | 158142c2 | bellard | z.low = 0;
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318 | bb98fe42 | Andreas Färber | z.high = ( (uint64_t) float32_val(a) )<<41;
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319 | 158142c2 | bellard | return z;
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320 | 158142c2 | bellard | } |
321 | 158142c2 | bellard | |
322 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
323 | 158142c2 | bellard | | Returns the result of converting the canonical NaN `a' to the single-
|
324 | 158142c2 | bellard | | precision floating-point format.
|
325 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
326 | 158142c2 | bellard | |
327 | bcd4d9af | Christophe Lyon | static float32 commonNaNToFloat32( commonNaNT a STATUS_PARAM)
|
328 | 158142c2 | bellard | { |
329 | bb98fe42 | Andreas Färber | uint32_t mantissa = a.high>>41;
|
330 | bcd4d9af | Christophe Lyon | |
331 | bcd4d9af | Christophe Lyon | if ( STATUS(default_nan_mode) ) {
|
332 | bcd4d9af | Christophe Lyon | return float32_default_nan;
|
333 | bcd4d9af | Christophe Lyon | } |
334 | bcd4d9af | Christophe Lyon | |
335 | 85016c98 | ths | if ( mantissa )
|
336 | 85016c98 | ths | return make_float32(
|
337 | bb98fe42 | Andreas Färber | ( ( (uint32_t) a.sign )<<31 ) | 0x7F800000 | ( a.high>>41 ) ); |
338 | 85016c98 | ths | else
|
339 | 85016c98 | ths | return float32_default_nan;
|
340 | 158142c2 | bellard | } |
341 | 158142c2 | bellard | |
342 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
343 | 354f211b | Peter Maydell | | Select which NaN to propagate for a two-input operation.
|
344 | 354f211b | Peter Maydell | | IEEE754 doesn't specify all the details of this, so the
|
345 | 354f211b | Peter Maydell | | algorithm is target-specific.
|
346 | 354f211b | Peter Maydell | | The routine is passed various bits of information about the
|
347 | 354f211b | Peter Maydell | | two NaNs and should return 0 to select NaN a and 1 for NaN b.
|
348 | 354f211b | Peter Maydell | | Note that signalling NaNs are always squashed to quiet NaNs
|
349 | 1f398e08 | Aurelien Jarno | | by the caller, by calling floatXX_maybe_silence_nan() before
|
350 | 1f398e08 | Aurelien Jarno | | returning them.
|
351 | 354f211b | Peter Maydell | |
|
352 | 354f211b | Peter Maydell | | aIsLargerSignificand is only valid if both a and b are NaNs
|
353 | 354f211b | Peter Maydell | | of some kind, and is true if a has the larger significand,
|
354 | 354f211b | Peter Maydell | | or if both a and b have the same significand but a is
|
355 | 354f211b | Peter Maydell | | positive but b is negative. It is only needed for the x87
|
356 | 354f211b | Peter Maydell | | tie-break rule.
|
357 | 354f211b | Peter Maydell | *----------------------------------------------------------------------------*/
|
358 | 354f211b | Peter Maydell | |
359 | 011da610 | Peter Maydell | #if defined(TARGET_ARM)
|
360 | 011da610 | Peter Maydell | static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
361 | 011da610 | Peter Maydell | flag aIsLargerSignificand) |
362 | 011da610 | Peter Maydell | { |
363 | 011da610 | Peter Maydell | /* ARM mandated NaN propagation rules: take the first of:
|
364 | 011da610 | Peter Maydell | * 1. A if it is signaling
|
365 | 011da610 | Peter Maydell | * 2. B if it is signaling
|
366 | 011da610 | Peter Maydell | * 3. A (quiet)
|
367 | 011da610 | Peter Maydell | * 4. B (quiet)
|
368 | 011da610 | Peter Maydell | * A signaling NaN is always quietened before returning it.
|
369 | 011da610 | Peter Maydell | */
|
370 | 011da610 | Peter Maydell | if (aIsSNaN) {
|
371 | 011da610 | Peter Maydell | return 0; |
372 | 011da610 | Peter Maydell | } else if (bIsSNaN) { |
373 | 011da610 | Peter Maydell | return 1; |
374 | 011da610 | Peter Maydell | } else if (aIsQNaN) { |
375 | 011da610 | Peter Maydell | return 0; |
376 | 011da610 | Peter Maydell | } else {
|
377 | 011da610 | Peter Maydell | return 1; |
378 | 011da610 | Peter Maydell | } |
379 | 011da610 | Peter Maydell | } |
380 | 084d19ba | Aurelien Jarno | #elif defined(TARGET_MIPS)
|
381 | 084d19ba | Aurelien Jarno | static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
382 | 084d19ba | Aurelien Jarno | flag aIsLargerSignificand) |
383 | 084d19ba | Aurelien Jarno | { |
384 | 084d19ba | Aurelien Jarno | /* According to MIPS specifications, if one of the two operands is
|
385 | 084d19ba | Aurelien Jarno | * a sNaN, a new qNaN has to be generated. This is done in
|
386 | 084d19ba | Aurelien Jarno | * floatXX_maybe_silence_nan(). For qNaN inputs the specifications
|
387 | 084d19ba | Aurelien Jarno | * says: "When possible, this QNaN result is one of the operand QNaN
|
388 | 084d19ba | Aurelien Jarno | * values." In practice it seems that most implementations choose
|
389 | 084d19ba | Aurelien Jarno | * the first operand if both operands are qNaN. In short this gives
|
390 | 084d19ba | Aurelien Jarno | * the following rules:
|
391 | 084d19ba | Aurelien Jarno | * 1. A if it is signaling
|
392 | 084d19ba | Aurelien Jarno | * 2. B if it is signaling
|
393 | 084d19ba | Aurelien Jarno | * 3. A (quiet)
|
394 | 084d19ba | Aurelien Jarno | * 4. B (quiet)
|
395 | 084d19ba | Aurelien Jarno | * A signaling NaN is always silenced before returning it.
|
396 | 084d19ba | Aurelien Jarno | */
|
397 | 084d19ba | Aurelien Jarno | if (aIsSNaN) {
|
398 | 084d19ba | Aurelien Jarno | return 0; |
399 | 084d19ba | Aurelien Jarno | } else if (bIsSNaN) { |
400 | 084d19ba | Aurelien Jarno | return 1; |
401 | 084d19ba | Aurelien Jarno | } else if (aIsQNaN) { |
402 | 084d19ba | Aurelien Jarno | return 0; |
403 | 084d19ba | Aurelien Jarno | } else {
|
404 | 084d19ba | Aurelien Jarno | return 1; |
405 | 084d19ba | Aurelien Jarno | } |
406 | 084d19ba | Aurelien Jarno | } |
407 | b81fe822 | Max Filippov | #elif defined(TARGET_PPC) || defined(TARGET_XTENSA)
|
408 | e024e881 | Aurelien Jarno | static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
409 | e024e881 | Aurelien Jarno | flag aIsLargerSignificand) |
410 | e024e881 | Aurelien Jarno | { |
411 | e024e881 | Aurelien Jarno | /* PowerPC propagation rules:
|
412 | e024e881 | Aurelien Jarno | * 1. A if it sNaN or qNaN
|
413 | e024e881 | Aurelien Jarno | * 2. B if it sNaN or qNaN
|
414 | e024e881 | Aurelien Jarno | * A signaling NaN is always silenced before returning it.
|
415 | e024e881 | Aurelien Jarno | */
|
416 | e024e881 | Aurelien Jarno | if (aIsSNaN || aIsQNaN) {
|
417 | e024e881 | Aurelien Jarno | return 0; |
418 | e024e881 | Aurelien Jarno | } else {
|
419 | e024e881 | Aurelien Jarno | return 1; |
420 | e024e881 | Aurelien Jarno | } |
421 | e024e881 | Aurelien Jarno | } |
422 | 011da610 | Peter Maydell | #else
|
423 | 354f211b | Peter Maydell | static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
424 | 354f211b | Peter Maydell | flag aIsLargerSignificand) |
425 | 354f211b | Peter Maydell | { |
426 | 354f211b | Peter Maydell | /* This implements x87 NaN propagation rules:
|
427 | 354f211b | Peter Maydell | * SNaN + QNaN => return the QNaN
|
428 | 354f211b | Peter Maydell | * two SNaNs => return the one with the larger significand, silenced
|
429 | 354f211b | Peter Maydell | * two QNaNs => return the one with the larger significand
|
430 | 354f211b | Peter Maydell | * SNaN and a non-NaN => return the SNaN, silenced
|
431 | 354f211b | Peter Maydell | * QNaN and a non-NaN => return the QNaN
|
432 | 354f211b | Peter Maydell | *
|
433 | 354f211b | Peter Maydell | * If we get down to comparing significands and they are the same,
|
434 | 354f211b | Peter Maydell | * return the NaN with the positive sign bit (if any).
|
435 | 354f211b | Peter Maydell | */
|
436 | 354f211b | Peter Maydell | if (aIsSNaN) {
|
437 | 354f211b | Peter Maydell | if (bIsSNaN) {
|
438 | 354f211b | Peter Maydell | return aIsLargerSignificand ? 0 : 1; |
439 | 354f211b | Peter Maydell | } |
440 | 354f211b | Peter Maydell | return bIsQNaN ? 1 : 0; |
441 | 354f211b | Peter Maydell | } |
442 | 354f211b | Peter Maydell | else if (aIsQNaN) { |
443 | 354f211b | Peter Maydell | if (bIsSNaN || !bIsQNaN)
|
444 | 354f211b | Peter Maydell | return 0; |
445 | 354f211b | Peter Maydell | else {
|
446 | 354f211b | Peter Maydell | return aIsLargerSignificand ? 0 : 1; |
447 | 354f211b | Peter Maydell | } |
448 | 354f211b | Peter Maydell | } else {
|
449 | 354f211b | Peter Maydell | return 1; |
450 | 354f211b | Peter Maydell | } |
451 | 354f211b | Peter Maydell | } |
452 | 011da610 | Peter Maydell | #endif
|
453 | 354f211b | Peter Maydell | |
454 | 354f211b | Peter Maydell | /*----------------------------------------------------------------------------
|
455 | 369be8f6 | Peter Maydell | | Select which NaN to propagate for a three-input operation.
|
456 | 369be8f6 | Peter Maydell | | For the moment we assume that no CPU needs the 'larger significand'
|
457 | 369be8f6 | Peter Maydell | | information.
|
458 | 369be8f6 | Peter Maydell | | Return values : 0 : a; 1 : b; 2 : c; 3 : default-NaN
|
459 | 369be8f6 | Peter Maydell | *----------------------------------------------------------------------------*/
|
460 | 369be8f6 | Peter Maydell | #if defined(TARGET_ARM)
|
461 | 369be8f6 | Peter Maydell | static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
462 | 369be8f6 | Peter Maydell | flag cIsQNaN, flag cIsSNaN, flag infzero STATUS_PARAM) |
463 | 369be8f6 | Peter Maydell | { |
464 | 369be8f6 | Peter Maydell | /* For ARM, the (inf,zero,qnan) case sets InvalidOp and returns
|
465 | 369be8f6 | Peter Maydell | * the default NaN
|
466 | 369be8f6 | Peter Maydell | */
|
467 | 369be8f6 | Peter Maydell | if (infzero && cIsQNaN) {
|
468 | 369be8f6 | Peter Maydell | float_raise(float_flag_invalid STATUS_VAR); |
469 | 369be8f6 | Peter Maydell | return 3; |
470 | 369be8f6 | Peter Maydell | } |
471 | 369be8f6 | Peter Maydell | |
472 | 369be8f6 | Peter Maydell | /* This looks different from the ARM ARM pseudocode, because the ARM ARM
|
473 | 369be8f6 | Peter Maydell | * puts the operands to a fused mac operation (a*b)+c in the order c,a,b.
|
474 | 369be8f6 | Peter Maydell | */
|
475 | 369be8f6 | Peter Maydell | if (cIsSNaN) {
|
476 | 369be8f6 | Peter Maydell | return 2; |
477 | 369be8f6 | Peter Maydell | } else if (aIsSNaN) { |
478 | 369be8f6 | Peter Maydell | return 0; |
479 | 369be8f6 | Peter Maydell | } else if (bIsSNaN) { |
480 | 369be8f6 | Peter Maydell | return 1; |
481 | 369be8f6 | Peter Maydell | } else if (cIsQNaN) { |
482 | 369be8f6 | Peter Maydell | return 2; |
483 | 369be8f6 | Peter Maydell | } else if (aIsQNaN) { |
484 | 369be8f6 | Peter Maydell | return 0; |
485 | 369be8f6 | Peter Maydell | } else {
|
486 | 369be8f6 | Peter Maydell | return 1; |
487 | 369be8f6 | Peter Maydell | } |
488 | 369be8f6 | Peter Maydell | } |
489 | bbc1dede | Aurelien Jarno | #elif defined(TARGET_MIPS)
|
490 | bbc1dede | Aurelien Jarno | static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
491 | bbc1dede | Aurelien Jarno | flag cIsQNaN, flag cIsSNaN, flag infzero STATUS_PARAM) |
492 | bbc1dede | Aurelien Jarno | { |
493 | bbc1dede | Aurelien Jarno | /* For MIPS, the (inf,zero,qnan) case sets InvalidOp and returns
|
494 | bbc1dede | Aurelien Jarno | * the default NaN
|
495 | bbc1dede | Aurelien Jarno | */
|
496 | bbc1dede | Aurelien Jarno | if (infzero) {
|
497 | bbc1dede | Aurelien Jarno | float_raise(float_flag_invalid STATUS_VAR); |
498 | bbc1dede | Aurelien Jarno | return 3; |
499 | bbc1dede | Aurelien Jarno | } |
500 | bbc1dede | Aurelien Jarno | |
501 | bbc1dede | Aurelien Jarno | /* Prefer sNaN over qNaN, in the a, b, c order. */
|
502 | bbc1dede | Aurelien Jarno | if (aIsSNaN) {
|
503 | bbc1dede | Aurelien Jarno | return 0; |
504 | bbc1dede | Aurelien Jarno | } else if (bIsSNaN) { |
505 | bbc1dede | Aurelien Jarno | return 1; |
506 | bbc1dede | Aurelien Jarno | } else if (cIsSNaN) { |
507 | bbc1dede | Aurelien Jarno | return 2; |
508 | bbc1dede | Aurelien Jarno | } else if (aIsQNaN) { |
509 | bbc1dede | Aurelien Jarno | return 0; |
510 | bbc1dede | Aurelien Jarno | } else if (bIsQNaN) { |
511 | bbc1dede | Aurelien Jarno | return 1; |
512 | bbc1dede | Aurelien Jarno | } else {
|
513 | bbc1dede | Aurelien Jarno | return 2; |
514 | bbc1dede | Aurelien Jarno | } |
515 | bbc1dede | Aurelien Jarno | } |
516 | 369be8f6 | Peter Maydell | #elif defined(TARGET_PPC)
|
517 | 369be8f6 | Peter Maydell | static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
518 | 369be8f6 | Peter Maydell | flag cIsQNaN, flag cIsSNaN, flag infzero STATUS_PARAM) |
519 | 369be8f6 | Peter Maydell | { |
520 | 369be8f6 | Peter Maydell | /* For PPC, the (inf,zero,qnan) case sets InvalidOp, but we prefer
|
521 | 369be8f6 | Peter Maydell | * to return an input NaN if we have one (ie c) rather than generating
|
522 | 369be8f6 | Peter Maydell | * a default NaN
|
523 | 369be8f6 | Peter Maydell | */
|
524 | 369be8f6 | Peter Maydell | if (infzero) {
|
525 | 369be8f6 | Peter Maydell | float_raise(float_flag_invalid STATUS_VAR); |
526 | 369be8f6 | Peter Maydell | return 2; |
527 | 369be8f6 | Peter Maydell | } |
528 | 369be8f6 | Peter Maydell | |
529 | 369be8f6 | Peter Maydell | /* If fRA is a NaN return it; otherwise if fRB is a NaN return it;
|
530 | 369be8f6 | Peter Maydell | * otherwise return fRC. Note that muladd on PPC is (fRA * fRC) + frB
|
531 | 369be8f6 | Peter Maydell | */
|
532 | 369be8f6 | Peter Maydell | if (aIsSNaN || aIsQNaN) {
|
533 | 369be8f6 | Peter Maydell | return 0; |
534 | 369be8f6 | Peter Maydell | } else if (cIsSNaN || cIsQNaN) { |
535 | 369be8f6 | Peter Maydell | return 2; |
536 | 369be8f6 | Peter Maydell | } else {
|
537 | 369be8f6 | Peter Maydell | return 1; |
538 | 369be8f6 | Peter Maydell | } |
539 | 369be8f6 | Peter Maydell | } |
540 | 369be8f6 | Peter Maydell | #else
|
541 | 369be8f6 | Peter Maydell | /* A default implementation: prefer a to b to c.
|
542 | 369be8f6 | Peter Maydell | * This is unlikely to actually match any real implementation.
|
543 | 369be8f6 | Peter Maydell | */
|
544 | 369be8f6 | Peter Maydell | static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
545 | 369be8f6 | Peter Maydell | flag cIsQNaN, flag cIsSNaN, flag infzero STATUS_PARAM) |
546 | 369be8f6 | Peter Maydell | { |
547 | 369be8f6 | Peter Maydell | if (aIsSNaN || aIsQNaN) {
|
548 | 369be8f6 | Peter Maydell | return 0; |
549 | 369be8f6 | Peter Maydell | } else if (bIsSNaN || bIsQNaN) { |
550 | 369be8f6 | Peter Maydell | return 1; |
551 | 369be8f6 | Peter Maydell | } else {
|
552 | 369be8f6 | Peter Maydell | return 2; |
553 | 369be8f6 | Peter Maydell | } |
554 | 369be8f6 | Peter Maydell | } |
555 | 369be8f6 | Peter Maydell | #endif
|
556 | 369be8f6 | Peter Maydell | |
557 | 369be8f6 | Peter Maydell | /*----------------------------------------------------------------------------
|
558 | 158142c2 | bellard | | Takes two single-precision floating-point values `a' and `b', one of which
|
559 | 158142c2 | bellard | | is a NaN, and returns the appropriate NaN result. If either `a' or `b' is a
|
560 | 158142c2 | bellard | | signaling NaN, the invalid exception is raised.
|
561 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
562 | 158142c2 | bellard | |
563 | 158142c2 | bellard | static float32 propagateFloat32NaN( float32 a, float32 b STATUS_PARAM)
|
564 | 158142c2 | bellard | { |
565 | d735d695 | Aurelien Jarno | flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN; |
566 | d735d695 | Aurelien Jarno | flag aIsLargerSignificand; |
567 | bb98fe42 | Andreas Färber | uint32_t av, bv; |
568 | 158142c2 | bellard | |
569 | d735d695 | Aurelien Jarno | aIsQuietNaN = float32_is_quiet_nan( a ); |
570 | 158142c2 | bellard | aIsSignalingNaN = float32_is_signaling_nan( a ); |
571 | d735d695 | Aurelien Jarno | bIsQuietNaN = float32_is_quiet_nan( b ); |
572 | 158142c2 | bellard | bIsSignalingNaN = float32_is_signaling_nan( b ); |
573 | f090c9d4 | pbrook | av = float32_val(a); |
574 | f090c9d4 | pbrook | bv = float32_val(b); |
575 | 1f398e08 | Aurelien Jarno | |
576 | 158142c2 | bellard | if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid STATUS_VAR);
|
577 | 354f211b | Peter Maydell | |
578 | 10201602 | Aurelien Jarno | if ( STATUS(default_nan_mode) )
|
579 | 10201602 | Aurelien Jarno | return float32_default_nan;
|
580 | 10201602 | Aurelien Jarno | |
581 | bb98fe42 | Andreas Färber | if ((uint32_t)(av<<1) < (uint32_t)(bv<<1)) { |
582 | 354f211b | Peter Maydell | aIsLargerSignificand = 0;
|
583 | bb98fe42 | Andreas Färber | } else if ((uint32_t)(bv<<1) < (uint32_t)(av<<1)) { |
584 | 354f211b | Peter Maydell | aIsLargerSignificand = 1;
|
585 | 354f211b | Peter Maydell | } else {
|
586 | 354f211b | Peter Maydell | aIsLargerSignificand = (av < bv) ? 1 : 0; |
587 | 158142c2 | bellard | } |
588 | 354f211b | Peter Maydell | |
589 | d735d695 | Aurelien Jarno | if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
|
590 | 354f211b | Peter Maydell | aIsLargerSignificand)) { |
591 | 1f398e08 | Aurelien Jarno | return float32_maybe_silence_nan(b);
|
592 | 354f211b | Peter Maydell | } else {
|
593 | 1f398e08 | Aurelien Jarno | return float32_maybe_silence_nan(a);
|
594 | 158142c2 | bellard | } |
595 | 158142c2 | bellard | } |
596 | 158142c2 | bellard | |
597 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
598 | 369be8f6 | Peter Maydell | | Takes three single-precision floating-point values `a', `b' and `c', one of
|
599 | 369be8f6 | Peter Maydell | | which is a NaN, and returns the appropriate NaN result. If any of `a',
|
600 | 369be8f6 | Peter Maydell | | `b' or `c' is a signaling NaN, the invalid exception is raised.
|
601 | 369be8f6 | Peter Maydell | | The input infzero indicates whether a*b was 0*inf or inf*0 (in which case
|
602 | 369be8f6 | Peter Maydell | | obviously c is a NaN, and whether to propagate c or some other NaN is
|
603 | 369be8f6 | Peter Maydell | | implementation defined).
|
604 | 369be8f6 | Peter Maydell | *----------------------------------------------------------------------------*/
|
605 | 369be8f6 | Peter Maydell | |
606 | 369be8f6 | Peter Maydell | static float32 propagateFloat32MulAddNaN(float32 a, float32 b,
|
607 | 369be8f6 | Peter Maydell | float32 c, flag infzero STATUS_PARAM) |
608 | 369be8f6 | Peter Maydell | { |
609 | 369be8f6 | Peter Maydell | flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN, |
610 | 369be8f6 | Peter Maydell | cIsQuietNaN, cIsSignalingNaN; |
611 | 369be8f6 | Peter Maydell | int which;
|
612 | 369be8f6 | Peter Maydell | |
613 | 369be8f6 | Peter Maydell | aIsQuietNaN = float32_is_quiet_nan(a); |
614 | 369be8f6 | Peter Maydell | aIsSignalingNaN = float32_is_signaling_nan(a); |
615 | 369be8f6 | Peter Maydell | bIsQuietNaN = float32_is_quiet_nan(b); |
616 | 369be8f6 | Peter Maydell | bIsSignalingNaN = float32_is_signaling_nan(b); |
617 | 369be8f6 | Peter Maydell | cIsQuietNaN = float32_is_quiet_nan(c); |
618 | 369be8f6 | Peter Maydell | cIsSignalingNaN = float32_is_signaling_nan(c); |
619 | 369be8f6 | Peter Maydell | |
620 | 369be8f6 | Peter Maydell | if (aIsSignalingNaN | bIsSignalingNaN | cIsSignalingNaN) {
|
621 | 369be8f6 | Peter Maydell | float_raise(float_flag_invalid STATUS_VAR); |
622 | 369be8f6 | Peter Maydell | } |
623 | 369be8f6 | Peter Maydell | |
624 | 369be8f6 | Peter Maydell | which = pickNaNMulAdd(aIsQuietNaN, aIsSignalingNaN, |
625 | 369be8f6 | Peter Maydell | bIsQuietNaN, bIsSignalingNaN, |
626 | 369be8f6 | Peter Maydell | cIsQuietNaN, cIsSignalingNaN, infzero STATUS_VAR); |
627 | 369be8f6 | Peter Maydell | |
628 | 369be8f6 | Peter Maydell | if (STATUS(default_nan_mode)) {
|
629 | 369be8f6 | Peter Maydell | /* Note that this check is after pickNaNMulAdd so that function
|
630 | 369be8f6 | Peter Maydell | * has an opportunity to set the Invalid flag.
|
631 | 369be8f6 | Peter Maydell | */
|
632 | 369be8f6 | Peter Maydell | return float32_default_nan;
|
633 | 369be8f6 | Peter Maydell | } |
634 | 369be8f6 | Peter Maydell | |
635 | 369be8f6 | Peter Maydell | switch (which) {
|
636 | 369be8f6 | Peter Maydell | case 0: |
637 | 369be8f6 | Peter Maydell | return float32_maybe_silence_nan(a);
|
638 | 369be8f6 | Peter Maydell | case 1: |
639 | 369be8f6 | Peter Maydell | return float32_maybe_silence_nan(b);
|
640 | 369be8f6 | Peter Maydell | case 2: |
641 | 369be8f6 | Peter Maydell | return float32_maybe_silence_nan(c);
|
642 | 369be8f6 | Peter Maydell | case 3: |
643 | 369be8f6 | Peter Maydell | default:
|
644 | 369be8f6 | Peter Maydell | return float32_default_nan;
|
645 | 369be8f6 | Peter Maydell | } |
646 | 369be8f6 | Peter Maydell | } |
647 | 369be8f6 | Peter Maydell | |
648 | 213ff4e6 | Max Filippov | #ifdef NO_SIGNALING_NANS
|
649 | 213ff4e6 | Max Filippov | int float64_is_quiet_nan(float64 a_)
|
650 | 213ff4e6 | Max Filippov | { |
651 | 213ff4e6 | Max Filippov | return float64_is_any_nan(a_);
|
652 | 213ff4e6 | Max Filippov | } |
653 | 213ff4e6 | Max Filippov | |
654 | 213ff4e6 | Max Filippov | int float64_is_signaling_nan(float64 a_)
|
655 | 213ff4e6 | Max Filippov | { |
656 | 213ff4e6 | Max Filippov | return 0; |
657 | 213ff4e6 | Max Filippov | } |
658 | 213ff4e6 | Max Filippov | #else
|
659 | 369be8f6 | Peter Maydell | /*----------------------------------------------------------------------------
|
660 | 5a6932d5 | ths | | Returns 1 if the double-precision floating-point value `a' is a quiet
|
661 | 5a6932d5 | ths | | NaN; otherwise returns 0.
|
662 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
663 | 158142c2 | bellard | |
664 | 18569871 | Peter Maydell | int float64_is_quiet_nan( float64 a_ )
|
665 | 158142c2 | bellard | { |
666 | bb98fe42 | Andreas Färber | uint64_t a = float64_val(a_); |
667 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
|
668 | b645bb48 | ths | return
|
669 | b645bb48 | ths | ( ( ( a>>51 ) & 0xFFF ) == 0xFFE ) |
670 | b645bb48 | ths | && ( a & LIT64( 0x0007FFFFFFFFFFFF ) );
|
671 | b645bb48 | ths | #else
|
672 | bb98fe42 | Andreas Färber | return ( LIT64( 0xFFF0000000000000 ) <= (uint64_t) ( a<<1 ) ); |
673 | b645bb48 | ths | #endif
|
674 | 158142c2 | bellard | } |
675 | 158142c2 | bellard | |
676 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
677 | 158142c2 | bellard | | Returns 1 if the double-precision floating-point value `a' is a signaling
|
678 | 158142c2 | bellard | | NaN; otherwise returns 0.
|
679 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
680 | 158142c2 | bellard | |
681 | f090c9d4 | pbrook | int float64_is_signaling_nan( float64 a_ )
|
682 | 158142c2 | bellard | { |
683 | bb98fe42 | Andreas Färber | uint64_t a = float64_val(a_); |
684 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
|
685 | bb98fe42 | Andreas Färber | return ( LIT64( 0xFFF0000000000000 ) <= (uint64_t) ( a<<1 ) ); |
686 | b645bb48 | ths | #else
|
687 | 158142c2 | bellard | return
|
688 | 158142c2 | bellard | ( ( ( a>>51 ) & 0xFFF ) == 0xFFE ) |
689 | 158142c2 | bellard | && ( a & LIT64( 0x0007FFFFFFFFFFFF ) );
|
690 | b645bb48 | ths | #endif
|
691 | 158142c2 | bellard | } |
692 | 213ff4e6 | Max Filippov | #endif
|
693 | 158142c2 | bellard | |
694 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
695 | b408dbde | Peter Maydell | | Returns a quiet NaN if the double-precision floating point value `a' is a
|
696 | b408dbde | Peter Maydell | | signaling NaN; otherwise returns `a'.
|
697 | b408dbde | Peter Maydell | *----------------------------------------------------------------------------*/
|
698 | b408dbde | Peter Maydell | |
699 | b408dbde | Peter Maydell | float64 float64_maybe_silence_nan( float64 a_ ) |
700 | b408dbde | Peter Maydell | { |
701 | b408dbde | Peter Maydell | if (float64_is_signaling_nan(a_)) {
|
702 | b408dbde | Peter Maydell | #if SNAN_BIT_IS_ONE
|
703 | d2fbca94 | Guan Xuetao | # if defined(TARGET_MIPS) || defined(TARGET_SH4) || defined(TARGET_UNICORE32)
|
704 | 93ae1c6f | Aurelien Jarno | return float64_default_nan;
|
705 | 93ae1c6f | Aurelien Jarno | # else
|
706 | 93ae1c6f | Aurelien Jarno | # error Rules for silencing a signaling NaN are target-specific |
707 | 93ae1c6f | Aurelien Jarno | # endif
|
708 | b408dbde | Peter Maydell | #else
|
709 | bb98fe42 | Andreas Färber | uint64_t a = float64_val(a_); |
710 | b408dbde | Peter Maydell | a |= LIT64( 0x0008000000000000 );
|
711 | b408dbde | Peter Maydell | return make_float64(a);
|
712 | 93ae1c6f | Aurelien Jarno | #endif
|
713 | b408dbde | Peter Maydell | } |
714 | b408dbde | Peter Maydell | return a_;
|
715 | b408dbde | Peter Maydell | } |
716 | b408dbde | Peter Maydell | |
717 | b408dbde | Peter Maydell | /*----------------------------------------------------------------------------
|
718 | 158142c2 | bellard | | Returns the result of converting the double-precision floating-point NaN
|
719 | 158142c2 | bellard | | `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid
|
720 | 158142c2 | bellard | | exception is raised.
|
721 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
722 | 158142c2 | bellard | |
723 | 158142c2 | bellard | static commonNaNT float64ToCommonNaN( float64 a STATUS_PARAM)
|
724 | 158142c2 | bellard | { |
725 | 158142c2 | bellard | commonNaNT z; |
726 | 158142c2 | bellard | |
727 | 158142c2 | bellard | if ( float64_is_signaling_nan( a ) ) float_raise( float_flag_invalid STATUS_VAR);
|
728 | f090c9d4 | pbrook | z.sign = float64_val(a)>>63;
|
729 | 158142c2 | bellard | z.low = 0;
|
730 | f090c9d4 | pbrook | z.high = float64_val(a)<<12;
|
731 | 158142c2 | bellard | return z;
|
732 | 158142c2 | bellard | } |
733 | 158142c2 | bellard | |
734 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
735 | 158142c2 | bellard | | Returns the result of converting the canonical NaN `a' to the double-
|
736 | 158142c2 | bellard | | precision floating-point format.
|
737 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
738 | 158142c2 | bellard | |
739 | bcd4d9af | Christophe Lyon | static float64 commonNaNToFloat64( commonNaNT a STATUS_PARAM)
|
740 | 158142c2 | bellard | { |
741 | bb98fe42 | Andreas Färber | uint64_t mantissa = a.high>>12;
|
742 | 85016c98 | ths | |
743 | bcd4d9af | Christophe Lyon | if ( STATUS(default_nan_mode) ) {
|
744 | bcd4d9af | Christophe Lyon | return float64_default_nan;
|
745 | bcd4d9af | Christophe Lyon | } |
746 | bcd4d9af | Christophe Lyon | |
747 | 85016c98 | ths | if ( mantissa )
|
748 | 85016c98 | ths | return make_float64(
|
749 | bb98fe42 | Andreas Färber | ( ( (uint64_t) a.sign )<<63 )
|
750 | 85016c98 | ths | | LIT64( 0x7FF0000000000000 )
|
751 | 85016c98 | ths | | ( a.high>>12 ));
|
752 | 85016c98 | ths | else
|
753 | 85016c98 | ths | return float64_default_nan;
|
754 | 158142c2 | bellard | } |
755 | 158142c2 | bellard | |
756 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
757 | 158142c2 | bellard | | Takes two double-precision floating-point values `a' and `b', one of which
|
758 | 158142c2 | bellard | | is a NaN, and returns the appropriate NaN result. If either `a' or `b' is a
|
759 | 158142c2 | bellard | | signaling NaN, the invalid exception is raised.
|
760 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
761 | 158142c2 | bellard | |
762 | 158142c2 | bellard | static float64 propagateFloat64NaN( float64 a, float64 b STATUS_PARAM)
|
763 | 158142c2 | bellard | { |
764 | d735d695 | Aurelien Jarno | flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN; |
765 | d735d695 | Aurelien Jarno | flag aIsLargerSignificand; |
766 | bb98fe42 | Andreas Färber | uint64_t av, bv; |
767 | 158142c2 | bellard | |
768 | d735d695 | Aurelien Jarno | aIsQuietNaN = float64_is_quiet_nan( a ); |
769 | 158142c2 | bellard | aIsSignalingNaN = float64_is_signaling_nan( a ); |
770 | d735d695 | Aurelien Jarno | bIsQuietNaN = float64_is_quiet_nan( b ); |
771 | 158142c2 | bellard | bIsSignalingNaN = float64_is_signaling_nan( b ); |
772 | f090c9d4 | pbrook | av = float64_val(a); |
773 | f090c9d4 | pbrook | bv = float64_val(b); |
774 | 1f398e08 | Aurelien Jarno | |
775 | 158142c2 | bellard | if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid STATUS_VAR);
|
776 | 354f211b | Peter Maydell | |
777 | 10201602 | Aurelien Jarno | if ( STATUS(default_nan_mode) )
|
778 | 10201602 | Aurelien Jarno | return float64_default_nan;
|
779 | 10201602 | Aurelien Jarno | |
780 | bb98fe42 | Andreas Färber | if ((uint64_t)(av<<1) < (uint64_t)(bv<<1)) { |
781 | 354f211b | Peter Maydell | aIsLargerSignificand = 0;
|
782 | bb98fe42 | Andreas Färber | } else if ((uint64_t)(bv<<1) < (uint64_t)(av<<1)) { |
783 | 354f211b | Peter Maydell | aIsLargerSignificand = 1;
|
784 | 354f211b | Peter Maydell | } else {
|
785 | 354f211b | Peter Maydell | aIsLargerSignificand = (av < bv) ? 1 : 0; |
786 | 158142c2 | bellard | } |
787 | 354f211b | Peter Maydell | |
788 | d735d695 | Aurelien Jarno | if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
|
789 | 354f211b | Peter Maydell | aIsLargerSignificand)) { |
790 | 1f398e08 | Aurelien Jarno | return float64_maybe_silence_nan(b);
|
791 | 354f211b | Peter Maydell | } else {
|
792 | 1f398e08 | Aurelien Jarno | return float64_maybe_silence_nan(a);
|
793 | 158142c2 | bellard | } |
794 | 158142c2 | bellard | } |
795 | 158142c2 | bellard | |
796 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
797 | 369be8f6 | Peter Maydell | | Takes three double-precision floating-point values `a', `b' and `c', one of
|
798 | 369be8f6 | Peter Maydell | | which is a NaN, and returns the appropriate NaN result. If any of `a',
|
799 | 369be8f6 | Peter Maydell | | `b' or `c' is a signaling NaN, the invalid exception is raised.
|
800 | 369be8f6 | Peter Maydell | | The input infzero indicates whether a*b was 0*inf or inf*0 (in which case
|
801 | 369be8f6 | Peter Maydell | | obviously c is a NaN, and whether to propagate c or some other NaN is
|
802 | 369be8f6 | Peter Maydell | | implementation defined).
|
803 | 369be8f6 | Peter Maydell | *----------------------------------------------------------------------------*/
|
804 | 369be8f6 | Peter Maydell | |
805 | 369be8f6 | Peter Maydell | static float64 propagateFloat64MulAddNaN(float64 a, float64 b,
|
806 | 369be8f6 | Peter Maydell | float64 c, flag infzero STATUS_PARAM) |
807 | 369be8f6 | Peter Maydell | { |
808 | 369be8f6 | Peter Maydell | flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN, |
809 | 369be8f6 | Peter Maydell | cIsQuietNaN, cIsSignalingNaN; |
810 | 369be8f6 | Peter Maydell | int which;
|
811 | 369be8f6 | Peter Maydell | |
812 | 369be8f6 | Peter Maydell | aIsQuietNaN = float64_is_quiet_nan(a); |
813 | 369be8f6 | Peter Maydell | aIsSignalingNaN = float64_is_signaling_nan(a); |
814 | 369be8f6 | Peter Maydell | bIsQuietNaN = float64_is_quiet_nan(b); |
815 | 369be8f6 | Peter Maydell | bIsSignalingNaN = float64_is_signaling_nan(b); |
816 | 369be8f6 | Peter Maydell | cIsQuietNaN = float64_is_quiet_nan(c); |
817 | 369be8f6 | Peter Maydell | cIsSignalingNaN = float64_is_signaling_nan(c); |
818 | 369be8f6 | Peter Maydell | |
819 | 369be8f6 | Peter Maydell | if (aIsSignalingNaN | bIsSignalingNaN | cIsSignalingNaN) {
|
820 | 369be8f6 | Peter Maydell | float_raise(float_flag_invalid STATUS_VAR); |
821 | 369be8f6 | Peter Maydell | } |
822 | 369be8f6 | Peter Maydell | |
823 | 369be8f6 | Peter Maydell | which = pickNaNMulAdd(aIsQuietNaN, aIsSignalingNaN, |
824 | 369be8f6 | Peter Maydell | bIsQuietNaN, bIsSignalingNaN, |
825 | 369be8f6 | Peter Maydell | cIsQuietNaN, cIsSignalingNaN, infzero STATUS_VAR); |
826 | 369be8f6 | Peter Maydell | |
827 | 369be8f6 | Peter Maydell | if (STATUS(default_nan_mode)) {
|
828 | 369be8f6 | Peter Maydell | /* Note that this check is after pickNaNMulAdd so that function
|
829 | 369be8f6 | Peter Maydell | * has an opportunity to set the Invalid flag.
|
830 | 369be8f6 | Peter Maydell | */
|
831 | 369be8f6 | Peter Maydell | return float64_default_nan;
|
832 | 369be8f6 | Peter Maydell | } |
833 | 369be8f6 | Peter Maydell | |
834 | 369be8f6 | Peter Maydell | switch (which) {
|
835 | 369be8f6 | Peter Maydell | case 0: |
836 | 369be8f6 | Peter Maydell | return float64_maybe_silence_nan(a);
|
837 | 369be8f6 | Peter Maydell | case 1: |
838 | 369be8f6 | Peter Maydell | return float64_maybe_silence_nan(b);
|
839 | 369be8f6 | Peter Maydell | case 2: |
840 | 369be8f6 | Peter Maydell | return float64_maybe_silence_nan(c);
|
841 | 369be8f6 | Peter Maydell | case 3: |
842 | 369be8f6 | Peter Maydell | default:
|
843 | 369be8f6 | Peter Maydell | return float64_default_nan;
|
844 | 369be8f6 | Peter Maydell | } |
845 | 369be8f6 | Peter Maydell | } |
846 | 369be8f6 | Peter Maydell | |
847 | 213ff4e6 | Max Filippov | #ifdef NO_SIGNALING_NANS
|
848 | 213ff4e6 | Max Filippov | int floatx80_is_quiet_nan(floatx80 a_)
|
849 | 213ff4e6 | Max Filippov | { |
850 | 213ff4e6 | Max Filippov | return floatx80_is_any_nan(a_);
|
851 | 213ff4e6 | Max Filippov | } |
852 | 213ff4e6 | Max Filippov | |
853 | 213ff4e6 | Max Filippov | int floatx80_is_signaling_nan(floatx80 a_)
|
854 | 213ff4e6 | Max Filippov | { |
855 | 213ff4e6 | Max Filippov | return 0; |
856 | 213ff4e6 | Max Filippov | } |
857 | 213ff4e6 | Max Filippov | #else
|
858 | 369be8f6 | Peter Maydell | /*----------------------------------------------------------------------------
|
859 | 158142c2 | bellard | | Returns 1 if the extended double-precision floating-point value `a' is a
|
860 | de4af5f7 | Aurelien Jarno | | quiet NaN; otherwise returns 0. This slightly differs from the same
|
861 | de4af5f7 | Aurelien Jarno | | function for other types as floatx80 has an explicit bit.
|
862 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
863 | 158142c2 | bellard | |
864 | 18569871 | Peter Maydell | int floatx80_is_quiet_nan( floatx80 a )
|
865 | 158142c2 | bellard | { |
866 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
|
867 | bb98fe42 | Andreas Färber | uint64_t aLow; |
868 | 158142c2 | bellard | |
869 | 5a6932d5 | ths | aLow = a.low & ~ LIT64( 0x4000000000000000 );
|
870 | 5a6932d5 | ths | return
|
871 | 5a6932d5 | ths | ( ( a.high & 0x7FFF ) == 0x7FFF ) |
872 | bb98fe42 | Andreas Färber | && (uint64_t) ( aLow<<1 )
|
873 | 5a6932d5 | ths | && ( a.low == aLow ); |
874 | 5a6932d5 | ths | #else
|
875 | de4af5f7 | Aurelien Jarno | return ( ( a.high & 0x7FFF ) == 0x7FFF ) |
876 | bb98fe42 | Andreas Färber | && (LIT64( 0x8000000000000000 ) <= ((uint64_t) ( a.low<<1 ))); |
877 | 5a6932d5 | ths | #endif
|
878 | 158142c2 | bellard | } |
879 | 158142c2 | bellard | |
880 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
881 | 158142c2 | bellard | | Returns 1 if the extended double-precision floating-point value `a' is a
|
882 | de4af5f7 | Aurelien Jarno | | signaling NaN; otherwise returns 0. This slightly differs from the same
|
883 | de4af5f7 | Aurelien Jarno | | function for other types as floatx80 has an explicit bit.
|
884 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
885 | 158142c2 | bellard | |
886 | 750afe93 | bellard | int floatx80_is_signaling_nan( floatx80 a )
|
887 | 158142c2 | bellard | { |
888 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
|
889 | de4af5f7 | Aurelien Jarno | return ( ( a.high & 0x7FFF ) == 0x7FFF ) |
890 | bb98fe42 | Andreas Färber | && (LIT64( 0x8000000000000000 ) <= ((uint64_t) ( a.low<<1 ))); |
891 | 5a6932d5 | ths | #else
|
892 | bb98fe42 | Andreas Färber | uint64_t aLow; |
893 | 158142c2 | bellard | |
894 | 158142c2 | bellard | aLow = a.low & ~ LIT64( 0x4000000000000000 );
|
895 | 158142c2 | bellard | return
|
896 | 158142c2 | bellard | ( ( a.high & 0x7FFF ) == 0x7FFF ) |
897 | bb98fe42 | Andreas Färber | && (uint64_t) ( aLow<<1 )
|
898 | 158142c2 | bellard | && ( a.low == aLow ); |
899 | 5a6932d5 | ths | #endif
|
900 | 158142c2 | bellard | } |
901 | 213ff4e6 | Max Filippov | #endif
|
902 | 158142c2 | bellard | |
903 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
904 | f6a7d92a | Aurelien Jarno | | Returns a quiet NaN if the extended double-precision floating point value
|
905 | f6a7d92a | Aurelien Jarno | | `a' is a signaling NaN; otherwise returns `a'.
|
906 | f6a7d92a | Aurelien Jarno | *----------------------------------------------------------------------------*/
|
907 | f6a7d92a | Aurelien Jarno | |
908 | f6a7d92a | Aurelien Jarno | floatx80 floatx80_maybe_silence_nan( floatx80 a ) |
909 | f6a7d92a | Aurelien Jarno | { |
910 | f6a7d92a | Aurelien Jarno | if (floatx80_is_signaling_nan(a)) {
|
911 | f6a7d92a | Aurelien Jarno | #if SNAN_BIT_IS_ONE
|
912 | d2fbca94 | Guan Xuetao | # if defined(TARGET_MIPS) || defined(TARGET_SH4) || defined(TARGET_UNICORE32)
|
913 | f6a7d92a | Aurelien Jarno | a.low = floatx80_default_nan_low; |
914 | f6a7d92a | Aurelien Jarno | a.high = floatx80_default_nan_high; |
915 | f6a7d92a | Aurelien Jarno | # else
|
916 | f6a7d92a | Aurelien Jarno | # error Rules for silencing a signaling NaN are target-specific |
917 | f6a7d92a | Aurelien Jarno | # endif
|
918 | f6a7d92a | Aurelien Jarno | #else
|
919 | f6a7d92a | Aurelien Jarno | a.low |= LIT64( 0xC000000000000000 );
|
920 | f6a7d92a | Aurelien Jarno | return a;
|
921 | f6a7d92a | Aurelien Jarno | #endif
|
922 | f6a7d92a | Aurelien Jarno | } |
923 | f6a7d92a | Aurelien Jarno | return a;
|
924 | f6a7d92a | Aurelien Jarno | } |
925 | f6a7d92a | Aurelien Jarno | |
926 | f6a7d92a | Aurelien Jarno | /*----------------------------------------------------------------------------
|
927 | 158142c2 | bellard | | Returns the result of converting the extended double-precision floating-
|
928 | 158142c2 | bellard | | point NaN `a' to the canonical NaN format. If `a' is a signaling NaN, the
|
929 | 158142c2 | bellard | | invalid exception is raised.
|
930 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
931 | 158142c2 | bellard | |
932 | 158142c2 | bellard | static commonNaNT floatx80ToCommonNaN( floatx80 a STATUS_PARAM)
|
933 | 158142c2 | bellard | { |
934 | 158142c2 | bellard | commonNaNT z; |
935 | 158142c2 | bellard | |
936 | 158142c2 | bellard | if ( floatx80_is_signaling_nan( a ) ) float_raise( float_flag_invalid STATUS_VAR);
|
937 | e2f42204 | Aurelien Jarno | if ( a.low >> 63 ) { |
938 | e2f42204 | Aurelien Jarno | z.sign = a.high >> 15;
|
939 | e2f42204 | Aurelien Jarno | z.low = 0;
|
940 | e2f42204 | Aurelien Jarno | z.high = a.low << 1;
|
941 | e2f42204 | Aurelien Jarno | } else {
|
942 | e2f42204 | Aurelien Jarno | z.sign = floatx80_default_nan_high >> 15;
|
943 | e2f42204 | Aurelien Jarno | z.low = 0;
|
944 | e2f42204 | Aurelien Jarno | z.high = floatx80_default_nan_low << 1;
|
945 | e2f42204 | Aurelien Jarno | } |
946 | 158142c2 | bellard | return z;
|
947 | 158142c2 | bellard | } |
948 | 158142c2 | bellard | |
949 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
950 | 158142c2 | bellard | | Returns the result of converting the canonical NaN `a' to the extended
|
951 | 158142c2 | bellard | | double-precision floating-point format.
|
952 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
953 | 158142c2 | bellard | |
954 | bcd4d9af | Christophe Lyon | static floatx80 commonNaNToFloatx80( commonNaNT a STATUS_PARAM)
|
955 | 158142c2 | bellard | { |
956 | 158142c2 | bellard | floatx80 z; |
957 | 158142c2 | bellard | |
958 | bcd4d9af | Christophe Lyon | if ( STATUS(default_nan_mode) ) {
|
959 | bcd4d9af | Christophe Lyon | z.low = floatx80_default_nan_low; |
960 | bcd4d9af | Christophe Lyon | z.high = floatx80_default_nan_high; |
961 | bcd4d9af | Christophe Lyon | return z;
|
962 | bcd4d9af | Christophe Lyon | } |
963 | bcd4d9af | Christophe Lyon | |
964 | e2f42204 | Aurelien Jarno | if (a.high >> 1) { |
965 | e2f42204 | Aurelien Jarno | z.low = LIT64( 0x8000000000000000 ) | a.high >> 1; |
966 | e2f42204 | Aurelien Jarno | z.high = ( ( (uint16_t) a.sign )<<15 ) | 0x7FFF; |
967 | e2f42204 | Aurelien Jarno | } else {
|
968 | 85016c98 | ths | z.low = floatx80_default_nan_low; |
969 | e2f42204 | Aurelien Jarno | z.high = floatx80_default_nan_high; |
970 | e2f42204 | Aurelien Jarno | } |
971 | e2f42204 | Aurelien Jarno | |
972 | 158142c2 | bellard | return z;
|
973 | 158142c2 | bellard | } |
974 | 158142c2 | bellard | |
975 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
976 | 158142c2 | bellard | | Takes two extended double-precision floating-point values `a' and `b', one
|
977 | 158142c2 | bellard | | of which is a NaN, and returns the appropriate NaN result. If either `a' or
|
978 | 158142c2 | bellard | | `b' is a signaling NaN, the invalid exception is raised.
|
979 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
980 | 158142c2 | bellard | |
981 | 158142c2 | bellard | static floatx80 propagateFloatx80NaN( floatx80 a, floatx80 b STATUS_PARAM)
|
982 | 158142c2 | bellard | { |
983 | d735d695 | Aurelien Jarno | flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN; |
984 | d735d695 | Aurelien Jarno | flag aIsLargerSignificand; |
985 | 158142c2 | bellard | |
986 | d735d695 | Aurelien Jarno | aIsQuietNaN = floatx80_is_quiet_nan( a ); |
987 | 158142c2 | bellard | aIsSignalingNaN = floatx80_is_signaling_nan( a ); |
988 | d735d695 | Aurelien Jarno | bIsQuietNaN = floatx80_is_quiet_nan( b ); |
989 | 158142c2 | bellard | bIsSignalingNaN = floatx80_is_signaling_nan( b ); |
990 | 1f398e08 | Aurelien Jarno | |
991 | 158142c2 | bellard | if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid STATUS_VAR);
|
992 | 354f211b | Peter Maydell | |
993 | 10201602 | Aurelien Jarno | if ( STATUS(default_nan_mode) ) {
|
994 | 10201602 | Aurelien Jarno | a.low = floatx80_default_nan_low; |
995 | 10201602 | Aurelien Jarno | a.high = floatx80_default_nan_high; |
996 | 10201602 | Aurelien Jarno | return a;
|
997 | 10201602 | Aurelien Jarno | } |
998 | 10201602 | Aurelien Jarno | |
999 | 354f211b | Peter Maydell | if (a.low < b.low) {
|
1000 | 354f211b | Peter Maydell | aIsLargerSignificand = 0;
|
1001 | 354f211b | Peter Maydell | } else if (b.low < a.low) { |
1002 | 354f211b | Peter Maydell | aIsLargerSignificand = 1;
|
1003 | 354f211b | Peter Maydell | } else {
|
1004 | 354f211b | Peter Maydell | aIsLargerSignificand = (a.high < b.high) ? 1 : 0; |
1005 | 158142c2 | bellard | } |
1006 | 354f211b | Peter Maydell | |
1007 | d735d695 | Aurelien Jarno | if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
|
1008 | 354f211b | Peter Maydell | aIsLargerSignificand)) { |
1009 | 1f398e08 | Aurelien Jarno | return floatx80_maybe_silence_nan(b);
|
1010 | 354f211b | Peter Maydell | } else {
|
1011 | 1f398e08 | Aurelien Jarno | return floatx80_maybe_silence_nan(a);
|
1012 | 158142c2 | bellard | } |
1013 | 158142c2 | bellard | } |
1014 | 158142c2 | bellard | |
1015 | 213ff4e6 | Max Filippov | #ifdef NO_SIGNALING_NANS
|
1016 | 213ff4e6 | Max Filippov | int float128_is_quiet_nan(float128 a_)
|
1017 | 213ff4e6 | Max Filippov | { |
1018 | 213ff4e6 | Max Filippov | return float128_is_any_nan(a_);
|
1019 | 213ff4e6 | Max Filippov | } |
1020 | 213ff4e6 | Max Filippov | |
1021 | 213ff4e6 | Max Filippov | int float128_is_signaling_nan(float128 a_)
|
1022 | 213ff4e6 | Max Filippov | { |
1023 | 213ff4e6 | Max Filippov | return 0; |
1024 | 213ff4e6 | Max Filippov | } |
1025 | 213ff4e6 | Max Filippov | #else
|
1026 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
1027 | 5a6932d5 | ths | | Returns 1 if the quadruple-precision floating-point value `a' is a quiet
|
1028 | 5a6932d5 | ths | | NaN; otherwise returns 0.
|
1029 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
1030 | 158142c2 | bellard | |
1031 | 18569871 | Peter Maydell | int float128_is_quiet_nan( float128 a )
|
1032 | 158142c2 | bellard | { |
1033 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
|
1034 | 5a6932d5 | ths | return
|
1035 | 5a6932d5 | ths | ( ( ( a.high>>47 ) & 0xFFFF ) == 0xFFFE ) |
1036 | 5a6932d5 | ths | && ( a.low || ( a.high & LIT64( 0x00007FFFFFFFFFFF ) ) );
|
1037 | 5a6932d5 | ths | #else
|
1038 | 158142c2 | bellard | return
|
1039 | bb98fe42 | Andreas Färber | ( LIT64( 0xFFFE000000000000 ) <= (uint64_t) ( a.high<<1 ) ) |
1040 | 158142c2 | bellard | && ( a.low || ( a.high & LIT64( 0x0000FFFFFFFFFFFF ) ) );
|
1041 | 5a6932d5 | ths | #endif
|
1042 | 158142c2 | bellard | } |
1043 | 158142c2 | bellard | |
1044 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
1045 | 158142c2 | bellard | | Returns 1 if the quadruple-precision floating-point value `a' is a
|
1046 | 158142c2 | bellard | | signaling NaN; otherwise returns 0.
|
1047 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
1048 | 158142c2 | bellard | |
1049 | 750afe93 | bellard | int float128_is_signaling_nan( float128 a )
|
1050 | 158142c2 | bellard | { |
1051 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
|
1052 | 5a6932d5 | ths | return
|
1053 | bb98fe42 | Andreas Färber | ( LIT64( 0xFFFE000000000000 ) <= (uint64_t) ( a.high<<1 ) ) |
1054 | 5a6932d5 | ths | && ( a.low || ( a.high & LIT64( 0x0000FFFFFFFFFFFF ) ) );
|
1055 | 5a6932d5 | ths | #else
|
1056 | 158142c2 | bellard | return
|
1057 | 158142c2 | bellard | ( ( ( a.high>>47 ) & 0xFFFF ) == 0xFFFE ) |
1058 | 158142c2 | bellard | && ( a.low || ( a.high & LIT64( 0x00007FFFFFFFFFFF ) ) );
|
1059 | 5a6932d5 | ths | #endif
|
1060 | 158142c2 | bellard | } |
1061 | 213ff4e6 | Max Filippov | #endif
|
1062 | 158142c2 | bellard | |
1063 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
1064 | f6a7d92a | Aurelien Jarno | | Returns a quiet NaN if the quadruple-precision floating point value `a' is
|
1065 | f6a7d92a | Aurelien Jarno | | a signaling NaN; otherwise returns `a'.
|
1066 | f6a7d92a | Aurelien Jarno | *----------------------------------------------------------------------------*/
|
1067 | f6a7d92a | Aurelien Jarno | |
1068 | f6a7d92a | Aurelien Jarno | float128 float128_maybe_silence_nan( float128 a ) |
1069 | f6a7d92a | Aurelien Jarno | { |
1070 | f6a7d92a | Aurelien Jarno | if (float128_is_signaling_nan(a)) {
|
1071 | f6a7d92a | Aurelien Jarno | #if SNAN_BIT_IS_ONE
|
1072 | d2fbca94 | Guan Xuetao | # if defined(TARGET_MIPS) || defined(TARGET_SH4) || defined(TARGET_UNICORE32)
|
1073 | f6a7d92a | Aurelien Jarno | a.low = float128_default_nan_low; |
1074 | f6a7d92a | Aurelien Jarno | a.high = float128_default_nan_high; |
1075 | f6a7d92a | Aurelien Jarno | # else
|
1076 | f6a7d92a | Aurelien Jarno | # error Rules for silencing a signaling NaN are target-specific |
1077 | f6a7d92a | Aurelien Jarno | # endif
|
1078 | f6a7d92a | Aurelien Jarno | #else
|
1079 | f6a7d92a | Aurelien Jarno | a.high |= LIT64( 0x0000800000000000 );
|
1080 | f6a7d92a | Aurelien Jarno | return a;
|
1081 | f6a7d92a | Aurelien Jarno | #endif
|
1082 | f6a7d92a | Aurelien Jarno | } |
1083 | f6a7d92a | Aurelien Jarno | return a;
|
1084 | f6a7d92a | Aurelien Jarno | } |
1085 | f6a7d92a | Aurelien Jarno | |
1086 | f6a7d92a | Aurelien Jarno | /*----------------------------------------------------------------------------
|
1087 | 158142c2 | bellard | | Returns the result of converting the quadruple-precision floating-point NaN
|
1088 | 158142c2 | bellard | | `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid
|
1089 | 158142c2 | bellard | | exception is raised.
|
1090 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
1091 | 158142c2 | bellard | |
1092 | 158142c2 | bellard | static commonNaNT float128ToCommonNaN( float128 a STATUS_PARAM)
|
1093 | 158142c2 | bellard | { |
1094 | 158142c2 | bellard | commonNaNT z; |
1095 | 158142c2 | bellard | |
1096 | 158142c2 | bellard | if ( float128_is_signaling_nan( a ) ) float_raise( float_flag_invalid STATUS_VAR);
|
1097 | 158142c2 | bellard | z.sign = a.high>>63;
|
1098 | 158142c2 | bellard | shortShift128Left( a.high, a.low, 16, &z.high, &z.low );
|
1099 | 158142c2 | bellard | return z;
|
1100 | 158142c2 | bellard | } |
1101 | 158142c2 | bellard | |
1102 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
1103 | 158142c2 | bellard | | Returns the result of converting the canonical NaN `a' to the quadruple-
|
1104 | 158142c2 | bellard | | precision floating-point format.
|
1105 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
1106 | 158142c2 | bellard | |
1107 | bcd4d9af | Christophe Lyon | static float128 commonNaNToFloat128( commonNaNT a STATUS_PARAM)
|
1108 | 158142c2 | bellard | { |
1109 | 158142c2 | bellard | float128 z; |
1110 | 158142c2 | bellard | |
1111 | bcd4d9af | Christophe Lyon | if ( STATUS(default_nan_mode) ) {
|
1112 | bcd4d9af | Christophe Lyon | z.low = float128_default_nan_low; |
1113 | bcd4d9af | Christophe Lyon | z.high = float128_default_nan_high; |
1114 | bcd4d9af | Christophe Lyon | return z;
|
1115 | bcd4d9af | Christophe Lyon | } |
1116 | bcd4d9af | Christophe Lyon | |
1117 | 158142c2 | bellard | shift128Right( a.high, a.low, 16, &z.high, &z.low );
|
1118 | bb98fe42 | Andreas Färber | z.high |= ( ( (uint64_t) a.sign )<<63 ) | LIT64( 0x7FFF000000000000 ); |
1119 | 158142c2 | bellard | return z;
|
1120 | 158142c2 | bellard | } |
1121 | 158142c2 | bellard | |
1122 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
1123 | 158142c2 | bellard | | Takes two quadruple-precision floating-point values `a' and `b', one of
|
1124 | 158142c2 | bellard | | which is a NaN, and returns the appropriate NaN result. If either `a' or
|
1125 | 158142c2 | bellard | | `b' is a signaling NaN, the invalid exception is raised.
|
1126 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
1127 | 158142c2 | bellard | |
1128 | 158142c2 | bellard | static float128 propagateFloat128NaN( float128 a, float128 b STATUS_PARAM)
|
1129 | 158142c2 | bellard | { |
1130 | d735d695 | Aurelien Jarno | flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN; |
1131 | d735d695 | Aurelien Jarno | flag aIsLargerSignificand; |
1132 | 158142c2 | bellard | |
1133 | d735d695 | Aurelien Jarno | aIsQuietNaN = float128_is_quiet_nan( a ); |
1134 | 158142c2 | bellard | aIsSignalingNaN = float128_is_signaling_nan( a ); |
1135 | d735d695 | Aurelien Jarno | bIsQuietNaN = float128_is_quiet_nan( b ); |
1136 | 158142c2 | bellard | bIsSignalingNaN = float128_is_signaling_nan( b ); |
1137 | 1f398e08 | Aurelien Jarno | |
1138 | 158142c2 | bellard | if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid STATUS_VAR);
|
1139 | 354f211b | Peter Maydell | |
1140 | 10201602 | Aurelien Jarno | if ( STATUS(default_nan_mode) ) {
|
1141 | 10201602 | Aurelien Jarno | a.low = float128_default_nan_low; |
1142 | 10201602 | Aurelien Jarno | a.high = float128_default_nan_high; |
1143 | 10201602 | Aurelien Jarno | return a;
|
1144 | 10201602 | Aurelien Jarno | } |
1145 | 10201602 | Aurelien Jarno | |
1146 | 354f211b | Peter Maydell | if (lt128(a.high<<1, a.low, b.high<<1, b.low)) { |
1147 | 354f211b | Peter Maydell | aIsLargerSignificand = 0;
|
1148 | 354f211b | Peter Maydell | } else if (lt128(b.high<<1, b.low, a.high<<1, a.low)) { |
1149 | 354f211b | Peter Maydell | aIsLargerSignificand = 1;
|
1150 | 354f211b | Peter Maydell | } else {
|
1151 | 354f211b | Peter Maydell | aIsLargerSignificand = (a.high < b.high) ? 1 : 0; |
1152 | 158142c2 | bellard | } |
1153 | 354f211b | Peter Maydell | |
1154 | d735d695 | Aurelien Jarno | if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
|
1155 | 354f211b | Peter Maydell | aIsLargerSignificand)) { |
1156 | 1f398e08 | Aurelien Jarno | return float128_maybe_silence_nan(b);
|
1157 | 354f211b | Peter Maydell | } else {
|
1158 | 1f398e08 | Aurelien Jarno | return float128_maybe_silence_nan(a);
|
1159 | 158142c2 | bellard | } |
1160 | 158142c2 | bellard | } |