root / fpu / softfloat-specialize.h @ 19bf7c87
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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 | 789ec7ce | Paolo Bonzini | /*----------------------------------------------------------------------------
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45 | 789ec7ce | Paolo Bonzini | | The pattern for a default generated half-precision NaN.
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46 | 789ec7ce | Paolo Bonzini | *----------------------------------------------------------------------------*/
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47 | 789ec7ce | Paolo Bonzini | #if defined(TARGET_ARM)
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48 | 789ec7ce | Paolo Bonzini | const float16 float16_default_nan = const_float16(0x7E00); |
49 | 789ec7ce | Paolo Bonzini | #elif SNAN_BIT_IS_ONE
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50 | 789ec7ce | Paolo Bonzini | const float16 float16_default_nan = const_float16(0x7DFF); |
51 | 789ec7ce | Paolo Bonzini | #else
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52 | 789ec7ce | Paolo Bonzini | const float16 float16_default_nan = const_float16(0xFE00); |
53 | 789ec7ce | Paolo Bonzini | #endif
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54 | 789ec7ce | Paolo Bonzini | |
55 | 789ec7ce | Paolo Bonzini | /*----------------------------------------------------------------------------
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56 | 789ec7ce | Paolo Bonzini | | The pattern for a default generated single-precision NaN.
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57 | 789ec7ce | Paolo Bonzini | *----------------------------------------------------------------------------*/
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58 | 789ec7ce | Paolo Bonzini | #if defined(TARGET_SPARC)
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59 | 789ec7ce | Paolo Bonzini | const float32 float32_default_nan = const_float32(0x7FFFFFFF); |
60 | 789ec7ce | Paolo Bonzini | #elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA)
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61 | 789ec7ce | Paolo Bonzini | const float32 float32_default_nan = const_float32(0x7FC00000); |
62 | 789ec7ce | Paolo Bonzini | #elif SNAN_BIT_IS_ONE
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63 | 789ec7ce | Paolo Bonzini | const float32 float32_default_nan = const_float32(0x7FBFFFFF); |
64 | 789ec7ce | Paolo Bonzini | #else
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65 | 789ec7ce | Paolo Bonzini | const float32 float32_default_nan = const_float32(0xFFC00000); |
66 | 789ec7ce | Paolo Bonzini | #endif
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67 | 789ec7ce | Paolo Bonzini | |
68 | 789ec7ce | Paolo Bonzini | /*----------------------------------------------------------------------------
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69 | 789ec7ce | Paolo Bonzini | | The pattern for a default generated double-precision NaN.
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70 | 789ec7ce | Paolo Bonzini | *----------------------------------------------------------------------------*/
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71 | 789ec7ce | Paolo Bonzini | #if defined(TARGET_SPARC)
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72 | 789ec7ce | Paolo Bonzini | const float64 float64_default_nan = const_float64(LIT64( 0x7FFFFFFFFFFFFFFF )); |
73 | 789ec7ce | Paolo Bonzini | #elif defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_ALPHA)
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74 | 789ec7ce | Paolo Bonzini | const float64 float64_default_nan = const_float64(LIT64( 0x7FF8000000000000 )); |
75 | 789ec7ce | Paolo Bonzini | #elif SNAN_BIT_IS_ONE
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76 | 789ec7ce | Paolo Bonzini | const float64 float64_default_nan = const_float64(LIT64( 0x7FF7FFFFFFFFFFFF )); |
77 | 789ec7ce | Paolo Bonzini | #else
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78 | 789ec7ce | Paolo Bonzini | const float64 float64_default_nan = const_float64(LIT64( 0xFFF8000000000000 )); |
79 | 789ec7ce | Paolo Bonzini | #endif
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80 | 789ec7ce | Paolo Bonzini | |
81 | 789ec7ce | Paolo Bonzini | /*----------------------------------------------------------------------------
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82 | 789ec7ce | Paolo Bonzini | | The pattern for a default generated extended double-precision NaN.
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83 | 789ec7ce | Paolo Bonzini | *----------------------------------------------------------------------------*/
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84 | 789ec7ce | Paolo Bonzini | #if SNAN_BIT_IS_ONE
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85 | 789ec7ce | Paolo Bonzini | #define floatx80_default_nan_high 0x7FFF |
86 | 789ec7ce | Paolo Bonzini | #define floatx80_default_nan_low LIT64( 0xBFFFFFFFFFFFFFFF ) |
87 | 789ec7ce | Paolo Bonzini | #else
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88 | 789ec7ce | Paolo Bonzini | #define floatx80_default_nan_high 0xFFFF |
89 | 789ec7ce | Paolo Bonzini | #define floatx80_default_nan_low LIT64( 0xC000000000000000 ) |
90 | 789ec7ce | Paolo Bonzini | #endif
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91 | 789ec7ce | Paolo Bonzini | |
92 | 789ec7ce | Paolo Bonzini | const floatx80 floatx80_default_nan = make_floatx80(floatx80_default_nan_high,
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93 | 789ec7ce | Paolo Bonzini | floatx80_default_nan_low); |
94 | 789ec7ce | Paolo Bonzini | |
95 | 789ec7ce | Paolo Bonzini | /*----------------------------------------------------------------------------
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96 | 789ec7ce | Paolo Bonzini | | The pattern for a default generated quadruple-precision NaN. The `high' and
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97 | 789ec7ce | Paolo Bonzini | | `low' values hold the most- and least-significant bits, respectively.
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98 | 789ec7ce | Paolo Bonzini | *----------------------------------------------------------------------------*/
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99 | 789ec7ce | Paolo Bonzini | #if SNAN_BIT_IS_ONE
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100 | 789ec7ce | Paolo Bonzini | #define float128_default_nan_high LIT64( 0x7FFF7FFFFFFFFFFF ) |
101 | 789ec7ce | Paolo Bonzini | #define float128_default_nan_low LIT64( 0xFFFFFFFFFFFFFFFF ) |
102 | 789ec7ce | Paolo Bonzini | #else
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103 | 789ec7ce | Paolo Bonzini | #define float128_default_nan_high LIT64( 0xFFFF800000000000 ) |
104 | 789ec7ce | Paolo Bonzini | #define float128_default_nan_low LIT64( 0x0000000000000000 ) |
105 | 789ec7ce | Paolo Bonzini | #endif
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106 | 789ec7ce | Paolo Bonzini | |
107 | 789ec7ce | Paolo Bonzini | const float128 float128_default_nan = make_float128(float128_default_nan_high,
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108 | 789ec7ce | Paolo Bonzini | float128_default_nan_low); |
109 | 789ec7ce | Paolo Bonzini | |
110 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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111 | 158142c2 | bellard | | Raises the exceptions specified by `flags'. Floating-point traps can be
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112 | 158142c2 | bellard | | defined here if desired. It is currently not possible for such a trap
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113 | 158142c2 | bellard | | to substitute a result value. If traps are not implemented, this routine
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114 | 158142c2 | bellard | | should be simply `float_exception_flags |= flags;'.
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115 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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116 | 158142c2 | bellard | |
117 | 158142c2 | bellard | void float_raise( int8 flags STATUS_PARAM )
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118 | 158142c2 | bellard | { |
119 | 158142c2 | bellard | STATUS(float_exception_flags) |= flags; |
120 | 158142c2 | bellard | } |
121 | 158142c2 | bellard | |
122 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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123 | 158142c2 | bellard | | Internal canonical NaN format.
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124 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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125 | 158142c2 | bellard | typedef struct { |
126 | 158142c2 | bellard | flag sign; |
127 | bb98fe42 | Andreas Färber | uint64_t high, low; |
128 | 158142c2 | bellard | } commonNaNT; |
129 | 158142c2 | bellard | |
130 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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131 | bb4d4bb3 | Peter Maydell | | Returns 1 if the half-precision floating-point value `a' is a quiet
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132 | bb4d4bb3 | Peter Maydell | | NaN; otherwise returns 0.
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133 | bb4d4bb3 | Peter Maydell | *----------------------------------------------------------------------------*/
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134 | bb4d4bb3 | Peter Maydell | |
135 | bb4d4bb3 | Peter Maydell | int float16_is_quiet_nan(float16 a_)
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136 | bb4d4bb3 | Peter Maydell | { |
137 | bb4d4bb3 | Peter Maydell | uint16_t a = float16_val(a_); |
138 | bb4d4bb3 | Peter Maydell | #if SNAN_BIT_IS_ONE
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139 | bb4d4bb3 | Peter Maydell | return (((a >> 9) & 0x3F) == 0x3E) && (a & 0x1FF); |
140 | bb4d4bb3 | Peter Maydell | #else
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141 | bb4d4bb3 | Peter Maydell | return ((a & ~0x8000) >= 0x7c80); |
142 | bb4d4bb3 | Peter Maydell | #endif
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143 | bb4d4bb3 | Peter Maydell | } |
144 | bb4d4bb3 | Peter Maydell | |
145 | bb4d4bb3 | Peter Maydell | /*----------------------------------------------------------------------------
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146 | bb4d4bb3 | Peter Maydell | | Returns 1 if the half-precision floating-point value `a' is a signaling
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147 | bb4d4bb3 | Peter Maydell | | NaN; otherwise returns 0.
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148 | bb4d4bb3 | Peter Maydell | *----------------------------------------------------------------------------*/
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149 | bb4d4bb3 | Peter Maydell | |
150 | bb4d4bb3 | Peter Maydell | int float16_is_signaling_nan(float16 a_)
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151 | bb4d4bb3 | Peter Maydell | { |
152 | bb4d4bb3 | Peter Maydell | uint16_t a = float16_val(a_); |
153 | bb4d4bb3 | Peter Maydell | #if SNAN_BIT_IS_ONE
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154 | bb4d4bb3 | Peter Maydell | return ((a & ~0x8000) >= 0x7c80); |
155 | bb4d4bb3 | Peter Maydell | #else
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156 | bb4d4bb3 | Peter Maydell | return (((a >> 9) & 0x3F) == 0x3E) && (a & 0x1FF); |
157 | bb4d4bb3 | Peter Maydell | #endif
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158 | bb4d4bb3 | Peter Maydell | } |
159 | bb4d4bb3 | Peter Maydell | |
160 | bb4d4bb3 | Peter Maydell | /*----------------------------------------------------------------------------
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161 | bb4d4bb3 | Peter Maydell | | Returns a quiet NaN if the half-precision floating point value `a' is a
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162 | bb4d4bb3 | Peter Maydell | | signaling NaN; otherwise returns `a'.
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163 | bb4d4bb3 | Peter Maydell | *----------------------------------------------------------------------------*/
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164 | bb4d4bb3 | Peter Maydell | float16 float16_maybe_silence_nan(float16 a_) |
165 | bb4d4bb3 | Peter Maydell | { |
166 | bb4d4bb3 | Peter Maydell | if (float16_is_signaling_nan(a_)) {
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167 | bb4d4bb3 | Peter Maydell | #if SNAN_BIT_IS_ONE
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168 | d2fbca94 | Guan Xuetao | # if defined(TARGET_MIPS) || defined(TARGET_SH4) || defined(TARGET_UNICORE32)
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169 | bb4d4bb3 | Peter Maydell | return float16_default_nan;
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170 | bb4d4bb3 | Peter Maydell | # else
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171 | bb4d4bb3 | Peter Maydell | # error Rules for silencing a signaling NaN are target-specific |
172 | bb4d4bb3 | Peter Maydell | # endif
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173 | bb4d4bb3 | Peter Maydell | #else
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174 | bb4d4bb3 | Peter Maydell | uint16_t a = float16_val(a_); |
175 | bb4d4bb3 | Peter Maydell | a |= (1 << 9); |
176 | bb4d4bb3 | Peter Maydell | return make_float16(a);
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177 | bb4d4bb3 | Peter Maydell | #endif
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178 | bb4d4bb3 | Peter Maydell | } |
179 | bb4d4bb3 | Peter Maydell | return a_;
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180 | bb4d4bb3 | Peter Maydell | } |
181 | bb4d4bb3 | Peter Maydell | |
182 | bb4d4bb3 | Peter Maydell | /*----------------------------------------------------------------------------
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183 | f591e1be | Peter Maydell | | Returns the result of converting the half-precision floating-point NaN
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184 | f591e1be | Peter Maydell | | `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid
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185 | f591e1be | Peter Maydell | | exception is raised.
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186 | f591e1be | Peter Maydell | *----------------------------------------------------------------------------*/
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187 | f591e1be | Peter Maydell | |
188 | f591e1be | Peter Maydell | static commonNaNT float16ToCommonNaN( float16 a STATUS_PARAM )
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189 | f591e1be | Peter Maydell | { |
190 | f591e1be | Peter Maydell | commonNaNT z; |
191 | f591e1be | Peter Maydell | |
192 | f591e1be | Peter Maydell | if ( float16_is_signaling_nan( a ) ) float_raise( float_flag_invalid STATUS_VAR );
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193 | f591e1be | Peter Maydell | z.sign = float16_val(a) >> 15;
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194 | f591e1be | Peter Maydell | z.low = 0;
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195 | bb98fe42 | Andreas Färber | z.high = ((uint64_t) float16_val(a))<<54;
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196 | f591e1be | Peter Maydell | return z;
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197 | f591e1be | Peter Maydell | } |
198 | f591e1be | Peter Maydell | |
199 | f591e1be | Peter Maydell | /*----------------------------------------------------------------------------
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200 | 600e30d2 | Peter Maydell | | Returns the result of converting the canonical NaN `a' to the half-
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201 | 600e30d2 | Peter Maydell | | precision floating-point format.
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202 | 600e30d2 | Peter Maydell | *----------------------------------------------------------------------------*/
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203 | 600e30d2 | Peter Maydell | |
204 | 600e30d2 | Peter Maydell | static float16 commonNaNToFloat16(commonNaNT a STATUS_PARAM)
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205 | 600e30d2 | Peter Maydell | { |
206 | 600e30d2 | Peter Maydell | uint16_t mantissa = a.high>>54;
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207 | 600e30d2 | Peter Maydell | |
208 | 600e30d2 | Peter Maydell | if (STATUS(default_nan_mode)) {
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209 | 600e30d2 | Peter Maydell | return float16_default_nan;
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210 | 600e30d2 | Peter Maydell | } |
211 | 600e30d2 | Peter Maydell | |
212 | 600e30d2 | Peter Maydell | if (mantissa) {
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213 | 600e30d2 | Peter Maydell | return make_float16(((((uint16_t) a.sign) << 15) |
214 | 600e30d2 | Peter Maydell | | (0x1F << 10) | mantissa)); |
215 | 600e30d2 | Peter Maydell | } else {
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216 | 600e30d2 | Peter Maydell | return float16_default_nan;
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217 | 600e30d2 | Peter Maydell | } |
218 | 600e30d2 | Peter Maydell | } |
219 | 600e30d2 | Peter Maydell | |
220 | 600e30d2 | Peter Maydell | /*----------------------------------------------------------------------------
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221 | 5a6932d5 | ths | | Returns 1 if the single-precision floating-point value `a' is a quiet
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222 | 5a6932d5 | ths | | NaN; otherwise returns 0.
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223 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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224 | 158142c2 | bellard | |
225 | 18569871 | Peter Maydell | int float32_is_quiet_nan( float32 a_ )
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226 | 158142c2 | bellard | { |
227 | f090c9d4 | pbrook | uint32_t a = float32_val(a_); |
228 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
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229 | b645bb48 | ths | return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF ); |
230 | b645bb48 | ths | #else
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231 | bb98fe42 | Andreas Färber | return ( 0xFF800000 <= (uint32_t) ( a<<1 ) ); |
232 | b645bb48 | ths | #endif
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233 | 158142c2 | bellard | } |
234 | 158142c2 | bellard | |
235 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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236 | 158142c2 | bellard | | Returns 1 if the single-precision floating-point value `a' is a signaling
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237 | 158142c2 | bellard | | NaN; otherwise returns 0.
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238 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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239 | 158142c2 | bellard | |
240 | f090c9d4 | pbrook | int float32_is_signaling_nan( float32 a_ )
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241 | 158142c2 | bellard | { |
242 | f090c9d4 | pbrook | uint32_t a = float32_val(a_); |
243 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
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244 | bb98fe42 | Andreas Färber | return ( 0xFF800000 <= (uint32_t) ( a<<1 ) ); |
245 | b645bb48 | ths | #else
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246 | 158142c2 | bellard | return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF ); |
247 | b645bb48 | ths | #endif
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248 | 158142c2 | bellard | } |
249 | 158142c2 | bellard | |
250 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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251 | b408dbde | Peter Maydell | | Returns a quiet NaN if the single-precision floating point value `a' is a
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252 | b408dbde | Peter Maydell | | signaling NaN; otherwise returns `a'.
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253 | b408dbde | Peter Maydell | *----------------------------------------------------------------------------*/
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254 | b408dbde | Peter Maydell | |
255 | b408dbde | Peter Maydell | float32 float32_maybe_silence_nan( float32 a_ ) |
256 | b408dbde | Peter Maydell | { |
257 | b408dbde | Peter Maydell | if (float32_is_signaling_nan(a_)) {
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258 | b408dbde | Peter Maydell | #if SNAN_BIT_IS_ONE
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259 | d2fbca94 | Guan Xuetao | # if defined(TARGET_MIPS) || defined(TARGET_SH4) || defined(TARGET_UNICORE32)
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260 | 93ae1c6f | Aurelien Jarno | return float32_default_nan;
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261 | 93ae1c6f | Aurelien Jarno | # else
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262 | 93ae1c6f | Aurelien Jarno | # error Rules for silencing a signaling NaN are target-specific |
263 | 93ae1c6f | Aurelien Jarno | # endif
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264 | b408dbde | Peter Maydell | #else
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265 | bb98fe42 | Andreas Färber | uint32_t a = float32_val(a_); |
266 | b408dbde | Peter Maydell | a |= (1 << 22); |
267 | b408dbde | Peter Maydell | return make_float32(a);
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268 | 93ae1c6f | Aurelien Jarno | #endif
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269 | b408dbde | Peter Maydell | } |
270 | b408dbde | Peter Maydell | return a_;
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271 | b408dbde | Peter Maydell | } |
272 | b408dbde | Peter Maydell | |
273 | b408dbde | Peter Maydell | /*----------------------------------------------------------------------------
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274 | 158142c2 | bellard | | Returns the result of converting the single-precision floating-point NaN
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275 | 158142c2 | bellard | | `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid
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276 | 158142c2 | bellard | | exception is raised.
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277 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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278 | 158142c2 | bellard | |
279 | 158142c2 | bellard | static commonNaNT float32ToCommonNaN( float32 a STATUS_PARAM )
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280 | 158142c2 | bellard | { |
281 | 158142c2 | bellard | commonNaNT z; |
282 | 158142c2 | bellard | |
283 | 158142c2 | bellard | if ( float32_is_signaling_nan( a ) ) float_raise( float_flag_invalid STATUS_VAR );
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284 | f090c9d4 | pbrook | z.sign = float32_val(a)>>31;
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285 | 158142c2 | bellard | z.low = 0;
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286 | bb98fe42 | Andreas Färber | z.high = ( (uint64_t) float32_val(a) )<<41;
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287 | 158142c2 | bellard | return z;
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288 | 158142c2 | bellard | } |
289 | 158142c2 | bellard | |
290 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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291 | 158142c2 | bellard | | Returns the result of converting the canonical NaN `a' to the single-
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292 | 158142c2 | bellard | | precision floating-point format.
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293 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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294 | 158142c2 | bellard | |
295 | bcd4d9af | Christophe Lyon | static float32 commonNaNToFloat32( commonNaNT a STATUS_PARAM)
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296 | 158142c2 | bellard | { |
297 | bb98fe42 | Andreas Färber | uint32_t mantissa = a.high>>41;
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298 | bcd4d9af | Christophe Lyon | |
299 | bcd4d9af | Christophe Lyon | if ( STATUS(default_nan_mode) ) {
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300 | bcd4d9af | Christophe Lyon | return float32_default_nan;
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301 | bcd4d9af | Christophe Lyon | } |
302 | bcd4d9af | Christophe Lyon | |
303 | 85016c98 | ths | if ( mantissa )
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304 | 85016c98 | ths | return make_float32(
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305 | bb98fe42 | Andreas Färber | ( ( (uint32_t) a.sign )<<31 ) | 0x7F800000 | ( a.high>>41 ) ); |
306 | 85016c98 | ths | else
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307 | 85016c98 | ths | return float32_default_nan;
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308 | 158142c2 | bellard | } |
309 | 158142c2 | bellard | |
310 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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311 | 354f211b | Peter Maydell | | Select which NaN to propagate for a two-input operation.
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312 | 354f211b | Peter Maydell | | IEEE754 doesn't specify all the details of this, so the
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313 | 354f211b | Peter Maydell | | algorithm is target-specific.
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314 | 354f211b | Peter Maydell | | The routine is passed various bits of information about the
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315 | 354f211b | Peter Maydell | | two NaNs and should return 0 to select NaN a and 1 for NaN b.
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316 | 354f211b | Peter Maydell | | Note that signalling NaNs are always squashed to quiet NaNs
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317 | 1f398e08 | Aurelien Jarno | | by the caller, by calling floatXX_maybe_silence_nan() before
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318 | 1f398e08 | Aurelien Jarno | | returning them.
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319 | 354f211b | Peter Maydell | |
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320 | 354f211b | Peter Maydell | | aIsLargerSignificand is only valid if both a and b are NaNs
|
321 | 354f211b | Peter Maydell | | of some kind, and is true if a has the larger significand,
|
322 | 354f211b | Peter Maydell | | or if both a and b have the same significand but a is
|
323 | 354f211b | Peter Maydell | | positive but b is negative. It is only needed for the x87
|
324 | 354f211b | Peter Maydell | | tie-break rule.
|
325 | 354f211b | Peter Maydell | *----------------------------------------------------------------------------*/
|
326 | 354f211b | Peter Maydell | |
327 | 011da610 | Peter Maydell | #if defined(TARGET_ARM)
|
328 | 011da610 | Peter Maydell | static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
329 | 011da610 | Peter Maydell | flag aIsLargerSignificand) |
330 | 011da610 | Peter Maydell | { |
331 | 011da610 | Peter Maydell | /* ARM mandated NaN propagation rules: take the first of:
|
332 | 011da610 | Peter Maydell | * 1. A if it is signaling
|
333 | 011da610 | Peter Maydell | * 2. B if it is signaling
|
334 | 011da610 | Peter Maydell | * 3. A (quiet)
|
335 | 011da610 | Peter Maydell | * 4. B (quiet)
|
336 | 011da610 | Peter Maydell | * A signaling NaN is always quietened before returning it.
|
337 | 011da610 | Peter Maydell | */
|
338 | 011da610 | Peter Maydell | if (aIsSNaN) {
|
339 | 011da610 | Peter Maydell | return 0; |
340 | 011da610 | Peter Maydell | } else if (bIsSNaN) { |
341 | 011da610 | Peter Maydell | return 1; |
342 | 011da610 | Peter Maydell | } else if (aIsQNaN) { |
343 | 011da610 | Peter Maydell | return 0; |
344 | 011da610 | Peter Maydell | } else {
|
345 | 011da610 | Peter Maydell | return 1; |
346 | 011da610 | Peter Maydell | } |
347 | 011da610 | Peter Maydell | } |
348 | 084d19ba | Aurelien Jarno | #elif defined(TARGET_MIPS)
|
349 | 084d19ba | Aurelien Jarno | static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
350 | 084d19ba | Aurelien Jarno | flag aIsLargerSignificand) |
351 | 084d19ba | Aurelien Jarno | { |
352 | 084d19ba | Aurelien Jarno | /* According to MIPS specifications, if one of the two operands is
|
353 | 084d19ba | Aurelien Jarno | * a sNaN, a new qNaN has to be generated. This is done in
|
354 | 084d19ba | Aurelien Jarno | * floatXX_maybe_silence_nan(). For qNaN inputs the specifications
|
355 | 084d19ba | Aurelien Jarno | * says: "When possible, this QNaN result is one of the operand QNaN
|
356 | 084d19ba | Aurelien Jarno | * values." In practice it seems that most implementations choose
|
357 | 084d19ba | Aurelien Jarno | * the first operand if both operands are qNaN. In short this gives
|
358 | 084d19ba | Aurelien Jarno | * the following rules:
|
359 | 084d19ba | Aurelien Jarno | * 1. A if it is signaling
|
360 | 084d19ba | Aurelien Jarno | * 2. B if it is signaling
|
361 | 084d19ba | Aurelien Jarno | * 3. A (quiet)
|
362 | 084d19ba | Aurelien Jarno | * 4. B (quiet)
|
363 | 084d19ba | Aurelien Jarno | * A signaling NaN is always silenced before returning it.
|
364 | 084d19ba | Aurelien Jarno | */
|
365 | 084d19ba | Aurelien Jarno | if (aIsSNaN) {
|
366 | 084d19ba | Aurelien Jarno | return 0; |
367 | 084d19ba | Aurelien Jarno | } else if (bIsSNaN) { |
368 | 084d19ba | Aurelien Jarno | return 1; |
369 | 084d19ba | Aurelien Jarno | } else if (aIsQNaN) { |
370 | 084d19ba | Aurelien Jarno | return 0; |
371 | 084d19ba | Aurelien Jarno | } else {
|
372 | 084d19ba | Aurelien Jarno | return 1; |
373 | 084d19ba | Aurelien Jarno | } |
374 | 084d19ba | Aurelien Jarno | } |
375 | e024e881 | Aurelien Jarno | #elif defined(TARGET_PPC)
|
376 | e024e881 | Aurelien Jarno | static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
377 | e024e881 | Aurelien Jarno | flag aIsLargerSignificand) |
378 | e024e881 | Aurelien Jarno | { |
379 | e024e881 | Aurelien Jarno | /* PowerPC propagation rules:
|
380 | e024e881 | Aurelien Jarno | * 1. A if it sNaN or qNaN
|
381 | e024e881 | Aurelien Jarno | * 2. B if it sNaN or qNaN
|
382 | e024e881 | Aurelien Jarno | * A signaling NaN is always silenced before returning it.
|
383 | e024e881 | Aurelien Jarno | */
|
384 | e024e881 | Aurelien Jarno | if (aIsSNaN || aIsQNaN) {
|
385 | e024e881 | Aurelien Jarno | return 0; |
386 | e024e881 | Aurelien Jarno | } else {
|
387 | e024e881 | Aurelien Jarno | return 1; |
388 | e024e881 | Aurelien Jarno | } |
389 | e024e881 | Aurelien Jarno | } |
390 | 011da610 | Peter Maydell | #else
|
391 | 354f211b | Peter Maydell | static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
392 | 354f211b | Peter Maydell | flag aIsLargerSignificand) |
393 | 354f211b | Peter Maydell | { |
394 | 354f211b | Peter Maydell | /* This implements x87 NaN propagation rules:
|
395 | 354f211b | Peter Maydell | * SNaN + QNaN => return the QNaN
|
396 | 354f211b | Peter Maydell | * two SNaNs => return the one with the larger significand, silenced
|
397 | 354f211b | Peter Maydell | * two QNaNs => return the one with the larger significand
|
398 | 354f211b | Peter Maydell | * SNaN and a non-NaN => return the SNaN, silenced
|
399 | 354f211b | Peter Maydell | * QNaN and a non-NaN => return the QNaN
|
400 | 354f211b | Peter Maydell | *
|
401 | 354f211b | Peter Maydell | * If we get down to comparing significands and they are the same,
|
402 | 354f211b | Peter Maydell | * return the NaN with the positive sign bit (if any).
|
403 | 354f211b | Peter Maydell | */
|
404 | 354f211b | Peter Maydell | if (aIsSNaN) {
|
405 | 354f211b | Peter Maydell | if (bIsSNaN) {
|
406 | 354f211b | Peter Maydell | return aIsLargerSignificand ? 0 : 1; |
407 | 354f211b | Peter Maydell | } |
408 | 354f211b | Peter Maydell | return bIsQNaN ? 1 : 0; |
409 | 354f211b | Peter Maydell | } |
410 | 354f211b | Peter Maydell | else if (aIsQNaN) { |
411 | 354f211b | Peter Maydell | if (bIsSNaN || !bIsQNaN)
|
412 | 354f211b | Peter Maydell | return 0; |
413 | 354f211b | Peter Maydell | else {
|
414 | 354f211b | Peter Maydell | return aIsLargerSignificand ? 0 : 1; |
415 | 354f211b | Peter Maydell | } |
416 | 354f211b | Peter Maydell | } else {
|
417 | 354f211b | Peter Maydell | return 1; |
418 | 354f211b | Peter Maydell | } |
419 | 354f211b | Peter Maydell | } |
420 | 011da610 | Peter Maydell | #endif
|
421 | 354f211b | Peter Maydell | |
422 | 354f211b | Peter Maydell | /*----------------------------------------------------------------------------
|
423 | 369be8f6 | Peter Maydell | | Select which NaN to propagate for a three-input operation.
|
424 | 369be8f6 | Peter Maydell | | For the moment we assume that no CPU needs the 'larger significand'
|
425 | 369be8f6 | Peter Maydell | | information.
|
426 | 369be8f6 | Peter Maydell | | Return values : 0 : a; 1 : b; 2 : c; 3 : default-NaN
|
427 | 369be8f6 | Peter Maydell | *----------------------------------------------------------------------------*/
|
428 | 369be8f6 | Peter Maydell | #if defined(TARGET_ARM)
|
429 | 369be8f6 | Peter Maydell | static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
430 | 369be8f6 | Peter Maydell | flag cIsQNaN, flag cIsSNaN, flag infzero STATUS_PARAM) |
431 | 369be8f6 | Peter Maydell | { |
432 | 369be8f6 | Peter Maydell | /* For ARM, the (inf,zero,qnan) case sets InvalidOp and returns
|
433 | 369be8f6 | Peter Maydell | * the default NaN
|
434 | 369be8f6 | Peter Maydell | */
|
435 | 369be8f6 | Peter Maydell | if (infzero && cIsQNaN) {
|
436 | 369be8f6 | Peter Maydell | float_raise(float_flag_invalid STATUS_VAR); |
437 | 369be8f6 | Peter Maydell | return 3; |
438 | 369be8f6 | Peter Maydell | } |
439 | 369be8f6 | Peter Maydell | |
440 | 369be8f6 | Peter Maydell | /* This looks different from the ARM ARM pseudocode, because the ARM ARM
|
441 | 369be8f6 | Peter Maydell | * puts the operands to a fused mac operation (a*b)+c in the order c,a,b.
|
442 | 369be8f6 | Peter Maydell | */
|
443 | 369be8f6 | Peter Maydell | if (cIsSNaN) {
|
444 | 369be8f6 | Peter Maydell | return 2; |
445 | 369be8f6 | Peter Maydell | } else if (aIsSNaN) { |
446 | 369be8f6 | Peter Maydell | return 0; |
447 | 369be8f6 | Peter Maydell | } else if (bIsSNaN) { |
448 | 369be8f6 | Peter Maydell | return 1; |
449 | 369be8f6 | Peter Maydell | } else if (cIsQNaN) { |
450 | 369be8f6 | Peter Maydell | return 2; |
451 | 369be8f6 | Peter Maydell | } else if (aIsQNaN) { |
452 | 369be8f6 | Peter Maydell | return 0; |
453 | 369be8f6 | Peter Maydell | } else {
|
454 | 369be8f6 | Peter Maydell | return 1; |
455 | 369be8f6 | Peter Maydell | } |
456 | 369be8f6 | Peter Maydell | } |
457 | 369be8f6 | Peter Maydell | #elif defined(TARGET_PPC)
|
458 | 369be8f6 | Peter Maydell | static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
459 | 369be8f6 | Peter Maydell | flag cIsQNaN, flag cIsSNaN, flag infzero STATUS_PARAM) |
460 | 369be8f6 | Peter Maydell | { |
461 | 369be8f6 | Peter Maydell | /* For PPC, the (inf,zero,qnan) case sets InvalidOp, but we prefer
|
462 | 369be8f6 | Peter Maydell | * to return an input NaN if we have one (ie c) rather than generating
|
463 | 369be8f6 | Peter Maydell | * a default NaN
|
464 | 369be8f6 | Peter Maydell | */
|
465 | 369be8f6 | Peter Maydell | if (infzero) {
|
466 | 369be8f6 | Peter Maydell | float_raise(float_flag_invalid STATUS_VAR); |
467 | 369be8f6 | Peter Maydell | return 2; |
468 | 369be8f6 | Peter Maydell | } |
469 | 369be8f6 | Peter Maydell | |
470 | 369be8f6 | Peter Maydell | /* If fRA is a NaN return it; otherwise if fRB is a NaN return it;
|
471 | 369be8f6 | Peter Maydell | * otherwise return fRC. Note that muladd on PPC is (fRA * fRC) + frB
|
472 | 369be8f6 | Peter Maydell | */
|
473 | 369be8f6 | Peter Maydell | if (aIsSNaN || aIsQNaN) {
|
474 | 369be8f6 | Peter Maydell | return 0; |
475 | 369be8f6 | Peter Maydell | } else if (cIsSNaN || cIsQNaN) { |
476 | 369be8f6 | Peter Maydell | return 2; |
477 | 369be8f6 | Peter Maydell | } else {
|
478 | 369be8f6 | Peter Maydell | return 1; |
479 | 369be8f6 | Peter Maydell | } |
480 | 369be8f6 | Peter Maydell | } |
481 | 369be8f6 | Peter Maydell | #else
|
482 | 369be8f6 | Peter Maydell | /* A default implementation: prefer a to b to c.
|
483 | 369be8f6 | Peter Maydell | * This is unlikely to actually match any real implementation.
|
484 | 369be8f6 | Peter Maydell | */
|
485 | 369be8f6 | Peter Maydell | static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN, |
486 | 369be8f6 | Peter Maydell | flag cIsQNaN, flag cIsSNaN, flag infzero STATUS_PARAM) |
487 | 369be8f6 | Peter Maydell | { |
488 | 369be8f6 | Peter Maydell | if (aIsSNaN || aIsQNaN) {
|
489 | 369be8f6 | Peter Maydell | return 0; |
490 | 369be8f6 | Peter Maydell | } else if (bIsSNaN || bIsQNaN) { |
491 | 369be8f6 | Peter Maydell | return 1; |
492 | 369be8f6 | Peter Maydell | } else {
|
493 | 369be8f6 | Peter Maydell | return 2; |
494 | 369be8f6 | Peter Maydell | } |
495 | 369be8f6 | Peter Maydell | } |
496 | 369be8f6 | Peter Maydell | #endif
|
497 | 369be8f6 | Peter Maydell | |
498 | 369be8f6 | Peter Maydell | /*----------------------------------------------------------------------------
|
499 | 158142c2 | bellard | | Takes two single-precision floating-point values `a' and `b', one of which
|
500 | 158142c2 | bellard | | is a NaN, and returns the appropriate NaN result. If either `a' or `b' is a
|
501 | 158142c2 | bellard | | signaling NaN, the invalid exception is raised.
|
502 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
503 | 158142c2 | bellard | |
504 | 158142c2 | bellard | static float32 propagateFloat32NaN( float32 a, float32 b STATUS_PARAM)
|
505 | 158142c2 | bellard | { |
506 | d735d695 | Aurelien Jarno | flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN; |
507 | d735d695 | Aurelien Jarno | flag aIsLargerSignificand; |
508 | bb98fe42 | Andreas Färber | uint32_t av, bv; |
509 | 158142c2 | bellard | |
510 | d735d695 | Aurelien Jarno | aIsQuietNaN = float32_is_quiet_nan( a ); |
511 | 158142c2 | bellard | aIsSignalingNaN = float32_is_signaling_nan( a ); |
512 | d735d695 | Aurelien Jarno | bIsQuietNaN = float32_is_quiet_nan( b ); |
513 | 158142c2 | bellard | bIsSignalingNaN = float32_is_signaling_nan( b ); |
514 | f090c9d4 | pbrook | av = float32_val(a); |
515 | f090c9d4 | pbrook | bv = float32_val(b); |
516 | 1f398e08 | Aurelien Jarno | |
517 | 158142c2 | bellard | if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid STATUS_VAR);
|
518 | 354f211b | Peter Maydell | |
519 | 10201602 | Aurelien Jarno | if ( STATUS(default_nan_mode) )
|
520 | 10201602 | Aurelien Jarno | return float32_default_nan;
|
521 | 10201602 | Aurelien Jarno | |
522 | bb98fe42 | Andreas Färber | if ((uint32_t)(av<<1) < (uint32_t)(bv<<1)) { |
523 | 354f211b | Peter Maydell | aIsLargerSignificand = 0;
|
524 | bb98fe42 | Andreas Färber | } else if ((uint32_t)(bv<<1) < (uint32_t)(av<<1)) { |
525 | 354f211b | Peter Maydell | aIsLargerSignificand = 1;
|
526 | 354f211b | Peter Maydell | } else {
|
527 | 354f211b | Peter Maydell | aIsLargerSignificand = (av < bv) ? 1 : 0; |
528 | 158142c2 | bellard | } |
529 | 354f211b | Peter Maydell | |
530 | d735d695 | Aurelien Jarno | if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
|
531 | 354f211b | Peter Maydell | aIsLargerSignificand)) { |
532 | 1f398e08 | Aurelien Jarno | return float32_maybe_silence_nan(b);
|
533 | 354f211b | Peter Maydell | } else {
|
534 | 1f398e08 | Aurelien Jarno | return float32_maybe_silence_nan(a);
|
535 | 158142c2 | bellard | } |
536 | 158142c2 | bellard | } |
537 | 158142c2 | bellard | |
538 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
539 | 369be8f6 | Peter Maydell | | Takes three single-precision floating-point values `a', `b' and `c', one of
|
540 | 369be8f6 | Peter Maydell | | which is a NaN, and returns the appropriate NaN result. If any of `a',
|
541 | 369be8f6 | Peter Maydell | | `b' or `c' is a signaling NaN, the invalid exception is raised.
|
542 | 369be8f6 | Peter Maydell | | The input infzero indicates whether a*b was 0*inf or inf*0 (in which case
|
543 | 369be8f6 | Peter Maydell | | obviously c is a NaN, and whether to propagate c or some other NaN is
|
544 | 369be8f6 | Peter Maydell | | implementation defined).
|
545 | 369be8f6 | Peter Maydell | *----------------------------------------------------------------------------*/
|
546 | 369be8f6 | Peter Maydell | |
547 | 369be8f6 | Peter Maydell | static float32 propagateFloat32MulAddNaN(float32 a, float32 b,
|
548 | 369be8f6 | Peter Maydell | float32 c, flag infzero STATUS_PARAM) |
549 | 369be8f6 | Peter Maydell | { |
550 | 369be8f6 | Peter Maydell | flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN, |
551 | 369be8f6 | Peter Maydell | cIsQuietNaN, cIsSignalingNaN; |
552 | 369be8f6 | Peter Maydell | int which;
|
553 | 369be8f6 | Peter Maydell | |
554 | 369be8f6 | Peter Maydell | aIsQuietNaN = float32_is_quiet_nan(a); |
555 | 369be8f6 | Peter Maydell | aIsSignalingNaN = float32_is_signaling_nan(a); |
556 | 369be8f6 | Peter Maydell | bIsQuietNaN = float32_is_quiet_nan(b); |
557 | 369be8f6 | Peter Maydell | bIsSignalingNaN = float32_is_signaling_nan(b); |
558 | 369be8f6 | Peter Maydell | cIsQuietNaN = float32_is_quiet_nan(c); |
559 | 369be8f6 | Peter Maydell | cIsSignalingNaN = float32_is_signaling_nan(c); |
560 | 369be8f6 | Peter Maydell | |
561 | 369be8f6 | Peter Maydell | if (aIsSignalingNaN | bIsSignalingNaN | cIsSignalingNaN) {
|
562 | 369be8f6 | Peter Maydell | float_raise(float_flag_invalid STATUS_VAR); |
563 | 369be8f6 | Peter Maydell | } |
564 | 369be8f6 | Peter Maydell | |
565 | 369be8f6 | Peter Maydell | which = pickNaNMulAdd(aIsQuietNaN, aIsSignalingNaN, |
566 | 369be8f6 | Peter Maydell | bIsQuietNaN, bIsSignalingNaN, |
567 | 369be8f6 | Peter Maydell | cIsQuietNaN, cIsSignalingNaN, infzero STATUS_VAR); |
568 | 369be8f6 | Peter Maydell | |
569 | 369be8f6 | Peter Maydell | if (STATUS(default_nan_mode)) {
|
570 | 369be8f6 | Peter Maydell | /* Note that this check is after pickNaNMulAdd so that function
|
571 | 369be8f6 | Peter Maydell | * has an opportunity to set the Invalid flag.
|
572 | 369be8f6 | Peter Maydell | */
|
573 | 369be8f6 | Peter Maydell | return float32_default_nan;
|
574 | 369be8f6 | Peter Maydell | } |
575 | 369be8f6 | Peter Maydell | |
576 | 369be8f6 | Peter Maydell | switch (which) {
|
577 | 369be8f6 | Peter Maydell | case 0: |
578 | 369be8f6 | Peter Maydell | return float32_maybe_silence_nan(a);
|
579 | 369be8f6 | Peter Maydell | case 1: |
580 | 369be8f6 | Peter Maydell | return float32_maybe_silence_nan(b);
|
581 | 369be8f6 | Peter Maydell | case 2: |
582 | 369be8f6 | Peter Maydell | return float32_maybe_silence_nan(c);
|
583 | 369be8f6 | Peter Maydell | case 3: |
584 | 369be8f6 | Peter Maydell | default:
|
585 | 369be8f6 | Peter Maydell | return float32_default_nan;
|
586 | 369be8f6 | Peter Maydell | } |
587 | 369be8f6 | Peter Maydell | } |
588 | 369be8f6 | Peter Maydell | |
589 | 369be8f6 | Peter Maydell | /*----------------------------------------------------------------------------
|
590 | 5a6932d5 | ths | | Returns 1 if the double-precision floating-point value `a' is a quiet
|
591 | 5a6932d5 | ths | | NaN; otherwise returns 0.
|
592 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
593 | 158142c2 | bellard | |
594 | 18569871 | Peter Maydell | int float64_is_quiet_nan( float64 a_ )
|
595 | 158142c2 | bellard | { |
596 | bb98fe42 | Andreas Färber | uint64_t a = float64_val(a_); |
597 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
|
598 | b645bb48 | ths | return
|
599 | b645bb48 | ths | ( ( ( a>>51 ) & 0xFFF ) == 0xFFE ) |
600 | b645bb48 | ths | && ( a & LIT64( 0x0007FFFFFFFFFFFF ) );
|
601 | b645bb48 | ths | #else
|
602 | bb98fe42 | Andreas Färber | return ( LIT64( 0xFFF0000000000000 ) <= (uint64_t) ( a<<1 ) ); |
603 | b645bb48 | ths | #endif
|
604 | 158142c2 | bellard | } |
605 | 158142c2 | bellard | |
606 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
607 | 158142c2 | bellard | | Returns 1 if the double-precision floating-point value `a' is a signaling
|
608 | 158142c2 | bellard | | NaN; otherwise returns 0.
|
609 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
610 | 158142c2 | bellard | |
611 | f090c9d4 | pbrook | int float64_is_signaling_nan( float64 a_ )
|
612 | 158142c2 | bellard | { |
613 | bb98fe42 | Andreas Färber | uint64_t a = float64_val(a_); |
614 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
|
615 | bb98fe42 | Andreas Färber | return ( LIT64( 0xFFF0000000000000 ) <= (uint64_t) ( a<<1 ) ); |
616 | b645bb48 | ths | #else
|
617 | 158142c2 | bellard | return
|
618 | 158142c2 | bellard | ( ( ( a>>51 ) & 0xFFF ) == 0xFFE ) |
619 | 158142c2 | bellard | && ( a & LIT64( 0x0007FFFFFFFFFFFF ) );
|
620 | b645bb48 | ths | #endif
|
621 | 158142c2 | bellard | } |
622 | 158142c2 | bellard | |
623 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
624 | b408dbde | Peter Maydell | | Returns a quiet NaN if the double-precision floating point value `a' is a
|
625 | b408dbde | Peter Maydell | | signaling NaN; otherwise returns `a'.
|
626 | b408dbde | Peter Maydell | *----------------------------------------------------------------------------*/
|
627 | b408dbde | Peter Maydell | |
628 | b408dbde | Peter Maydell | float64 float64_maybe_silence_nan( float64 a_ ) |
629 | b408dbde | Peter Maydell | { |
630 | b408dbde | Peter Maydell | if (float64_is_signaling_nan(a_)) {
|
631 | b408dbde | Peter Maydell | #if SNAN_BIT_IS_ONE
|
632 | d2fbca94 | Guan Xuetao | # if defined(TARGET_MIPS) || defined(TARGET_SH4) || defined(TARGET_UNICORE32)
|
633 | 93ae1c6f | Aurelien Jarno | return float64_default_nan;
|
634 | 93ae1c6f | Aurelien Jarno | # else
|
635 | 93ae1c6f | Aurelien Jarno | # error Rules for silencing a signaling NaN are target-specific |
636 | 93ae1c6f | Aurelien Jarno | # endif
|
637 | b408dbde | Peter Maydell | #else
|
638 | bb98fe42 | Andreas Färber | uint64_t a = float64_val(a_); |
639 | b408dbde | Peter Maydell | a |= LIT64( 0x0008000000000000 );
|
640 | b408dbde | Peter Maydell | return make_float64(a);
|
641 | 93ae1c6f | Aurelien Jarno | #endif
|
642 | b408dbde | Peter Maydell | } |
643 | b408dbde | Peter Maydell | return a_;
|
644 | b408dbde | Peter Maydell | } |
645 | b408dbde | Peter Maydell | |
646 | b408dbde | Peter Maydell | /*----------------------------------------------------------------------------
|
647 | 158142c2 | bellard | | Returns the result of converting the double-precision floating-point NaN
|
648 | 158142c2 | bellard | | `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid
|
649 | 158142c2 | bellard | | exception is raised.
|
650 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
651 | 158142c2 | bellard | |
652 | 158142c2 | bellard | static commonNaNT float64ToCommonNaN( float64 a STATUS_PARAM)
|
653 | 158142c2 | bellard | { |
654 | 158142c2 | bellard | commonNaNT z; |
655 | 158142c2 | bellard | |
656 | 158142c2 | bellard | if ( float64_is_signaling_nan( a ) ) float_raise( float_flag_invalid STATUS_VAR);
|
657 | f090c9d4 | pbrook | z.sign = float64_val(a)>>63;
|
658 | 158142c2 | bellard | z.low = 0;
|
659 | f090c9d4 | pbrook | z.high = float64_val(a)<<12;
|
660 | 158142c2 | bellard | return z;
|
661 | 158142c2 | bellard | } |
662 | 158142c2 | bellard | |
663 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
664 | 158142c2 | bellard | | Returns the result of converting the canonical NaN `a' to the double-
|
665 | 158142c2 | bellard | | precision floating-point format.
|
666 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
667 | 158142c2 | bellard | |
668 | bcd4d9af | Christophe Lyon | static float64 commonNaNToFloat64( commonNaNT a STATUS_PARAM)
|
669 | 158142c2 | bellard | { |
670 | bb98fe42 | Andreas Färber | uint64_t mantissa = a.high>>12;
|
671 | 85016c98 | ths | |
672 | bcd4d9af | Christophe Lyon | if ( STATUS(default_nan_mode) ) {
|
673 | bcd4d9af | Christophe Lyon | return float64_default_nan;
|
674 | bcd4d9af | Christophe Lyon | } |
675 | bcd4d9af | Christophe Lyon | |
676 | 85016c98 | ths | if ( mantissa )
|
677 | 85016c98 | ths | return make_float64(
|
678 | bb98fe42 | Andreas Färber | ( ( (uint64_t) a.sign )<<63 )
|
679 | 85016c98 | ths | | LIT64( 0x7FF0000000000000 )
|
680 | 85016c98 | ths | | ( a.high>>12 ));
|
681 | 85016c98 | ths | else
|
682 | 85016c98 | ths | return float64_default_nan;
|
683 | 158142c2 | bellard | } |
684 | 158142c2 | bellard | |
685 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
686 | 158142c2 | bellard | | Takes two double-precision floating-point values `a' and `b', one of which
|
687 | 158142c2 | bellard | | is a NaN, and returns the appropriate NaN result. If either `a' or `b' is a
|
688 | 158142c2 | bellard | | signaling NaN, the invalid exception is raised.
|
689 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
690 | 158142c2 | bellard | |
691 | 158142c2 | bellard | static float64 propagateFloat64NaN( float64 a, float64 b STATUS_PARAM)
|
692 | 158142c2 | bellard | { |
693 | d735d695 | Aurelien Jarno | flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN; |
694 | d735d695 | Aurelien Jarno | flag aIsLargerSignificand; |
695 | bb98fe42 | Andreas Färber | uint64_t av, bv; |
696 | 158142c2 | bellard | |
697 | d735d695 | Aurelien Jarno | aIsQuietNaN = float64_is_quiet_nan( a ); |
698 | 158142c2 | bellard | aIsSignalingNaN = float64_is_signaling_nan( a ); |
699 | d735d695 | Aurelien Jarno | bIsQuietNaN = float64_is_quiet_nan( b ); |
700 | 158142c2 | bellard | bIsSignalingNaN = float64_is_signaling_nan( b ); |
701 | f090c9d4 | pbrook | av = float64_val(a); |
702 | f090c9d4 | pbrook | bv = float64_val(b); |
703 | 1f398e08 | Aurelien Jarno | |
704 | 158142c2 | bellard | if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid STATUS_VAR);
|
705 | 354f211b | Peter Maydell | |
706 | 10201602 | Aurelien Jarno | if ( STATUS(default_nan_mode) )
|
707 | 10201602 | Aurelien Jarno | return float64_default_nan;
|
708 | 10201602 | Aurelien Jarno | |
709 | bb98fe42 | Andreas Färber | if ((uint64_t)(av<<1) < (uint64_t)(bv<<1)) { |
710 | 354f211b | Peter Maydell | aIsLargerSignificand = 0;
|
711 | bb98fe42 | Andreas Färber | } else if ((uint64_t)(bv<<1) < (uint64_t)(av<<1)) { |
712 | 354f211b | Peter Maydell | aIsLargerSignificand = 1;
|
713 | 354f211b | Peter Maydell | } else {
|
714 | 354f211b | Peter Maydell | aIsLargerSignificand = (av < bv) ? 1 : 0; |
715 | 158142c2 | bellard | } |
716 | 354f211b | Peter Maydell | |
717 | d735d695 | Aurelien Jarno | if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
|
718 | 354f211b | Peter Maydell | aIsLargerSignificand)) { |
719 | 1f398e08 | Aurelien Jarno | return float64_maybe_silence_nan(b);
|
720 | 354f211b | Peter Maydell | } else {
|
721 | 1f398e08 | Aurelien Jarno | return float64_maybe_silence_nan(a);
|
722 | 158142c2 | bellard | } |
723 | 158142c2 | bellard | } |
724 | 158142c2 | bellard | |
725 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
726 | 369be8f6 | Peter Maydell | | Takes three double-precision floating-point values `a', `b' and `c', one of
|
727 | 369be8f6 | Peter Maydell | | which is a NaN, and returns the appropriate NaN result. If any of `a',
|
728 | 369be8f6 | Peter Maydell | | `b' or `c' is a signaling NaN, the invalid exception is raised.
|
729 | 369be8f6 | Peter Maydell | | The input infzero indicates whether a*b was 0*inf or inf*0 (in which case
|
730 | 369be8f6 | Peter Maydell | | obviously c is a NaN, and whether to propagate c or some other NaN is
|
731 | 369be8f6 | Peter Maydell | | implementation defined).
|
732 | 369be8f6 | Peter Maydell | *----------------------------------------------------------------------------*/
|
733 | 369be8f6 | Peter Maydell | |
734 | 369be8f6 | Peter Maydell | static float64 propagateFloat64MulAddNaN(float64 a, float64 b,
|
735 | 369be8f6 | Peter Maydell | float64 c, flag infzero STATUS_PARAM) |
736 | 369be8f6 | Peter Maydell | { |
737 | 369be8f6 | Peter Maydell | flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN, |
738 | 369be8f6 | Peter Maydell | cIsQuietNaN, cIsSignalingNaN; |
739 | 369be8f6 | Peter Maydell | int which;
|
740 | 369be8f6 | Peter Maydell | |
741 | 369be8f6 | Peter Maydell | aIsQuietNaN = float64_is_quiet_nan(a); |
742 | 369be8f6 | Peter Maydell | aIsSignalingNaN = float64_is_signaling_nan(a); |
743 | 369be8f6 | Peter Maydell | bIsQuietNaN = float64_is_quiet_nan(b); |
744 | 369be8f6 | Peter Maydell | bIsSignalingNaN = float64_is_signaling_nan(b); |
745 | 369be8f6 | Peter Maydell | cIsQuietNaN = float64_is_quiet_nan(c); |
746 | 369be8f6 | Peter Maydell | cIsSignalingNaN = float64_is_signaling_nan(c); |
747 | 369be8f6 | Peter Maydell | |
748 | 369be8f6 | Peter Maydell | if (aIsSignalingNaN | bIsSignalingNaN | cIsSignalingNaN) {
|
749 | 369be8f6 | Peter Maydell | float_raise(float_flag_invalid STATUS_VAR); |
750 | 369be8f6 | Peter Maydell | } |
751 | 369be8f6 | Peter Maydell | |
752 | 369be8f6 | Peter Maydell | which = pickNaNMulAdd(aIsQuietNaN, aIsSignalingNaN, |
753 | 369be8f6 | Peter Maydell | bIsQuietNaN, bIsSignalingNaN, |
754 | 369be8f6 | Peter Maydell | cIsQuietNaN, cIsSignalingNaN, infzero STATUS_VAR); |
755 | 369be8f6 | Peter Maydell | |
756 | 369be8f6 | Peter Maydell | if (STATUS(default_nan_mode)) {
|
757 | 369be8f6 | Peter Maydell | /* Note that this check is after pickNaNMulAdd so that function
|
758 | 369be8f6 | Peter Maydell | * has an opportunity to set the Invalid flag.
|
759 | 369be8f6 | Peter Maydell | */
|
760 | 369be8f6 | Peter Maydell | return float64_default_nan;
|
761 | 369be8f6 | Peter Maydell | } |
762 | 369be8f6 | Peter Maydell | |
763 | 369be8f6 | Peter Maydell | switch (which) {
|
764 | 369be8f6 | Peter Maydell | case 0: |
765 | 369be8f6 | Peter Maydell | return float64_maybe_silence_nan(a);
|
766 | 369be8f6 | Peter Maydell | case 1: |
767 | 369be8f6 | Peter Maydell | return float64_maybe_silence_nan(b);
|
768 | 369be8f6 | Peter Maydell | case 2: |
769 | 369be8f6 | Peter Maydell | return float64_maybe_silence_nan(c);
|
770 | 369be8f6 | Peter Maydell | case 3: |
771 | 369be8f6 | Peter Maydell | default:
|
772 | 369be8f6 | Peter Maydell | return float64_default_nan;
|
773 | 369be8f6 | Peter Maydell | } |
774 | 369be8f6 | Peter Maydell | } |
775 | 369be8f6 | Peter Maydell | |
776 | 369be8f6 | Peter Maydell | /*----------------------------------------------------------------------------
|
777 | 158142c2 | bellard | | Returns 1 if the extended double-precision floating-point value `a' is a
|
778 | de4af5f7 | Aurelien Jarno | | quiet NaN; otherwise returns 0. This slightly differs from the same
|
779 | de4af5f7 | Aurelien Jarno | | function for other types as floatx80 has an explicit bit.
|
780 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
781 | 158142c2 | bellard | |
782 | 18569871 | Peter Maydell | int floatx80_is_quiet_nan( floatx80 a )
|
783 | 158142c2 | bellard | { |
784 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
|
785 | bb98fe42 | Andreas Färber | uint64_t aLow; |
786 | 158142c2 | bellard | |
787 | 5a6932d5 | ths | aLow = a.low & ~ LIT64( 0x4000000000000000 );
|
788 | 5a6932d5 | ths | return
|
789 | 5a6932d5 | ths | ( ( a.high & 0x7FFF ) == 0x7FFF ) |
790 | bb98fe42 | Andreas Färber | && (uint64_t) ( aLow<<1 )
|
791 | 5a6932d5 | ths | && ( a.low == aLow ); |
792 | 5a6932d5 | ths | #else
|
793 | de4af5f7 | Aurelien Jarno | return ( ( a.high & 0x7FFF ) == 0x7FFF ) |
794 | bb98fe42 | Andreas Färber | && (LIT64( 0x8000000000000000 ) <= ((uint64_t) ( a.low<<1 ))); |
795 | 5a6932d5 | ths | #endif
|
796 | 158142c2 | bellard | } |
797 | 158142c2 | bellard | |
798 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
799 | 158142c2 | bellard | | Returns 1 if the extended double-precision floating-point value `a' is a
|
800 | de4af5f7 | Aurelien Jarno | | signaling NaN; otherwise returns 0. This slightly differs from the same
|
801 | de4af5f7 | Aurelien Jarno | | function for other types as floatx80 has an explicit bit.
|
802 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
803 | 158142c2 | bellard | |
804 | 750afe93 | bellard | int floatx80_is_signaling_nan( floatx80 a )
|
805 | 158142c2 | bellard | { |
806 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
|
807 | de4af5f7 | Aurelien Jarno | return ( ( a.high & 0x7FFF ) == 0x7FFF ) |
808 | bb98fe42 | Andreas Färber | && (LIT64( 0x8000000000000000 ) <= ((uint64_t) ( a.low<<1 ))); |
809 | 5a6932d5 | ths | #else
|
810 | bb98fe42 | Andreas Färber | uint64_t aLow; |
811 | 158142c2 | bellard | |
812 | 158142c2 | bellard | aLow = a.low & ~ LIT64( 0x4000000000000000 );
|
813 | 158142c2 | bellard | return
|
814 | 158142c2 | bellard | ( ( a.high & 0x7FFF ) == 0x7FFF ) |
815 | bb98fe42 | Andreas Färber | && (uint64_t) ( aLow<<1 )
|
816 | 158142c2 | bellard | && ( a.low == aLow ); |
817 | 5a6932d5 | ths | #endif
|
818 | 158142c2 | bellard | } |
819 | 158142c2 | bellard | |
820 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
821 | f6a7d92a | Aurelien Jarno | | Returns a quiet NaN if the extended double-precision floating point value
|
822 | f6a7d92a | Aurelien Jarno | | `a' is a signaling NaN; otherwise returns `a'.
|
823 | f6a7d92a | Aurelien Jarno | *----------------------------------------------------------------------------*/
|
824 | f6a7d92a | Aurelien Jarno | |
825 | f6a7d92a | Aurelien Jarno | floatx80 floatx80_maybe_silence_nan( floatx80 a ) |
826 | f6a7d92a | Aurelien Jarno | { |
827 | f6a7d92a | Aurelien Jarno | if (floatx80_is_signaling_nan(a)) {
|
828 | f6a7d92a | Aurelien Jarno | #if SNAN_BIT_IS_ONE
|
829 | d2fbca94 | Guan Xuetao | # if defined(TARGET_MIPS) || defined(TARGET_SH4) || defined(TARGET_UNICORE32)
|
830 | f6a7d92a | Aurelien Jarno | a.low = floatx80_default_nan_low; |
831 | f6a7d92a | Aurelien Jarno | a.high = floatx80_default_nan_high; |
832 | f6a7d92a | Aurelien Jarno | # else
|
833 | f6a7d92a | Aurelien Jarno | # error Rules for silencing a signaling NaN are target-specific |
834 | f6a7d92a | Aurelien Jarno | # endif
|
835 | f6a7d92a | Aurelien Jarno | #else
|
836 | f6a7d92a | Aurelien Jarno | a.low |= LIT64( 0xC000000000000000 );
|
837 | f6a7d92a | Aurelien Jarno | return a;
|
838 | f6a7d92a | Aurelien Jarno | #endif
|
839 | f6a7d92a | Aurelien Jarno | } |
840 | f6a7d92a | Aurelien Jarno | return a;
|
841 | f6a7d92a | Aurelien Jarno | } |
842 | f6a7d92a | Aurelien Jarno | |
843 | f6a7d92a | Aurelien Jarno | /*----------------------------------------------------------------------------
|
844 | 158142c2 | bellard | | Returns the result of converting the extended double-precision floating-
|
845 | 158142c2 | bellard | | point NaN `a' to the canonical NaN format. If `a' is a signaling NaN, the
|
846 | 158142c2 | bellard | | invalid exception is raised.
|
847 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
848 | 158142c2 | bellard | |
849 | 158142c2 | bellard | static commonNaNT floatx80ToCommonNaN( floatx80 a STATUS_PARAM)
|
850 | 158142c2 | bellard | { |
851 | 158142c2 | bellard | commonNaNT z; |
852 | 158142c2 | bellard | |
853 | 158142c2 | bellard | if ( floatx80_is_signaling_nan( a ) ) float_raise( float_flag_invalid STATUS_VAR);
|
854 | e2f42204 | Aurelien Jarno | if ( a.low >> 63 ) { |
855 | e2f42204 | Aurelien Jarno | z.sign = a.high >> 15;
|
856 | e2f42204 | Aurelien Jarno | z.low = 0;
|
857 | e2f42204 | Aurelien Jarno | z.high = a.low << 1;
|
858 | e2f42204 | Aurelien Jarno | } else {
|
859 | e2f42204 | Aurelien Jarno | z.sign = floatx80_default_nan_high >> 15;
|
860 | e2f42204 | Aurelien Jarno | z.low = 0;
|
861 | e2f42204 | Aurelien Jarno | z.high = floatx80_default_nan_low << 1;
|
862 | e2f42204 | Aurelien Jarno | } |
863 | 158142c2 | bellard | return z;
|
864 | 158142c2 | bellard | } |
865 | 158142c2 | bellard | |
866 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
867 | 158142c2 | bellard | | Returns the result of converting the canonical NaN `a' to the extended
|
868 | 158142c2 | bellard | | double-precision floating-point format.
|
869 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
870 | 158142c2 | bellard | |
871 | bcd4d9af | Christophe Lyon | static floatx80 commonNaNToFloatx80( commonNaNT a STATUS_PARAM)
|
872 | 158142c2 | bellard | { |
873 | 158142c2 | bellard | floatx80 z; |
874 | 158142c2 | bellard | |
875 | bcd4d9af | Christophe Lyon | if ( STATUS(default_nan_mode) ) {
|
876 | bcd4d9af | Christophe Lyon | z.low = floatx80_default_nan_low; |
877 | bcd4d9af | Christophe Lyon | z.high = floatx80_default_nan_high; |
878 | bcd4d9af | Christophe Lyon | return z;
|
879 | bcd4d9af | Christophe Lyon | } |
880 | bcd4d9af | Christophe Lyon | |
881 | e2f42204 | Aurelien Jarno | if (a.high >> 1) { |
882 | e2f42204 | Aurelien Jarno | z.low = LIT64( 0x8000000000000000 ) | a.high >> 1; |
883 | e2f42204 | Aurelien Jarno | z.high = ( ( (uint16_t) a.sign )<<15 ) | 0x7FFF; |
884 | e2f42204 | Aurelien Jarno | } else {
|
885 | 85016c98 | ths | z.low = floatx80_default_nan_low; |
886 | e2f42204 | Aurelien Jarno | z.high = floatx80_default_nan_high; |
887 | e2f42204 | Aurelien Jarno | } |
888 | e2f42204 | Aurelien Jarno | |
889 | 158142c2 | bellard | return z;
|
890 | 158142c2 | bellard | } |
891 | 158142c2 | bellard | |
892 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
893 | 158142c2 | bellard | | Takes two extended double-precision floating-point values `a' and `b', one
|
894 | 158142c2 | bellard | | of which is a NaN, and returns the appropriate NaN result. If either `a' or
|
895 | 158142c2 | bellard | | `b' is a signaling NaN, the invalid exception is raised.
|
896 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
897 | 158142c2 | bellard | |
898 | 158142c2 | bellard | static floatx80 propagateFloatx80NaN( floatx80 a, floatx80 b STATUS_PARAM)
|
899 | 158142c2 | bellard | { |
900 | d735d695 | Aurelien Jarno | flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN; |
901 | d735d695 | Aurelien Jarno | flag aIsLargerSignificand; |
902 | 158142c2 | bellard | |
903 | d735d695 | Aurelien Jarno | aIsQuietNaN = floatx80_is_quiet_nan( a ); |
904 | 158142c2 | bellard | aIsSignalingNaN = floatx80_is_signaling_nan( a ); |
905 | d735d695 | Aurelien Jarno | bIsQuietNaN = floatx80_is_quiet_nan( b ); |
906 | 158142c2 | bellard | bIsSignalingNaN = floatx80_is_signaling_nan( b ); |
907 | 1f398e08 | Aurelien Jarno | |
908 | 158142c2 | bellard | if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid STATUS_VAR);
|
909 | 354f211b | Peter Maydell | |
910 | 10201602 | Aurelien Jarno | if ( STATUS(default_nan_mode) ) {
|
911 | 10201602 | Aurelien Jarno | a.low = floatx80_default_nan_low; |
912 | 10201602 | Aurelien Jarno | a.high = floatx80_default_nan_high; |
913 | 10201602 | Aurelien Jarno | return a;
|
914 | 10201602 | Aurelien Jarno | } |
915 | 10201602 | Aurelien Jarno | |
916 | 354f211b | Peter Maydell | if (a.low < b.low) {
|
917 | 354f211b | Peter Maydell | aIsLargerSignificand = 0;
|
918 | 354f211b | Peter Maydell | } else if (b.low < a.low) { |
919 | 354f211b | Peter Maydell | aIsLargerSignificand = 1;
|
920 | 354f211b | Peter Maydell | } else {
|
921 | 354f211b | Peter Maydell | aIsLargerSignificand = (a.high < b.high) ? 1 : 0; |
922 | 158142c2 | bellard | } |
923 | 354f211b | Peter Maydell | |
924 | d735d695 | Aurelien Jarno | if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
|
925 | 354f211b | Peter Maydell | aIsLargerSignificand)) { |
926 | 1f398e08 | Aurelien Jarno | return floatx80_maybe_silence_nan(b);
|
927 | 354f211b | Peter Maydell | } else {
|
928 | 1f398e08 | Aurelien Jarno | return floatx80_maybe_silence_nan(a);
|
929 | 158142c2 | bellard | } |
930 | 158142c2 | bellard | } |
931 | 158142c2 | bellard | |
932 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
933 | 5a6932d5 | ths | | Returns 1 if the quadruple-precision floating-point value `a' is a quiet
|
934 | 5a6932d5 | ths | | NaN; otherwise returns 0.
|
935 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
936 | 158142c2 | bellard | |
937 | 18569871 | Peter Maydell | int float128_is_quiet_nan( float128 a )
|
938 | 158142c2 | bellard | { |
939 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
|
940 | 5a6932d5 | ths | return
|
941 | 5a6932d5 | ths | ( ( ( a.high>>47 ) & 0xFFFF ) == 0xFFFE ) |
942 | 5a6932d5 | ths | && ( a.low || ( a.high & LIT64( 0x00007FFFFFFFFFFF ) ) );
|
943 | 5a6932d5 | ths | #else
|
944 | 158142c2 | bellard | return
|
945 | bb98fe42 | Andreas Färber | ( LIT64( 0xFFFE000000000000 ) <= (uint64_t) ( a.high<<1 ) ) |
946 | 158142c2 | bellard | && ( a.low || ( a.high & LIT64( 0x0000FFFFFFFFFFFF ) ) );
|
947 | 5a6932d5 | ths | #endif
|
948 | 158142c2 | bellard | } |
949 | 158142c2 | bellard | |
950 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
951 | 158142c2 | bellard | | Returns 1 if the quadruple-precision floating-point value `a' is a
|
952 | 158142c2 | bellard | | signaling NaN; otherwise returns 0.
|
953 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
954 | 158142c2 | bellard | |
955 | 750afe93 | bellard | int float128_is_signaling_nan( float128 a )
|
956 | 158142c2 | bellard | { |
957 | 5a6932d5 | ths | #if SNAN_BIT_IS_ONE
|
958 | 5a6932d5 | ths | return
|
959 | bb98fe42 | Andreas Färber | ( LIT64( 0xFFFE000000000000 ) <= (uint64_t) ( a.high<<1 ) ) |
960 | 5a6932d5 | ths | && ( a.low || ( a.high & LIT64( 0x0000FFFFFFFFFFFF ) ) );
|
961 | 5a6932d5 | ths | #else
|
962 | 158142c2 | bellard | return
|
963 | 158142c2 | bellard | ( ( ( a.high>>47 ) & 0xFFFF ) == 0xFFFE ) |
964 | 158142c2 | bellard | && ( a.low || ( a.high & LIT64( 0x00007FFFFFFFFFFF ) ) );
|
965 | 5a6932d5 | ths | #endif
|
966 | 158142c2 | bellard | } |
967 | 158142c2 | bellard | |
968 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
969 | f6a7d92a | Aurelien Jarno | | Returns a quiet NaN if the quadruple-precision floating point value `a' is
|
970 | f6a7d92a | Aurelien Jarno | | a signaling NaN; otherwise returns `a'.
|
971 | f6a7d92a | Aurelien Jarno | *----------------------------------------------------------------------------*/
|
972 | f6a7d92a | Aurelien Jarno | |
973 | f6a7d92a | Aurelien Jarno | float128 float128_maybe_silence_nan( float128 a ) |
974 | f6a7d92a | Aurelien Jarno | { |
975 | f6a7d92a | Aurelien Jarno | if (float128_is_signaling_nan(a)) {
|
976 | f6a7d92a | Aurelien Jarno | #if SNAN_BIT_IS_ONE
|
977 | d2fbca94 | Guan Xuetao | # if defined(TARGET_MIPS) || defined(TARGET_SH4) || defined(TARGET_UNICORE32)
|
978 | f6a7d92a | Aurelien Jarno | a.low = float128_default_nan_low; |
979 | f6a7d92a | Aurelien Jarno | a.high = float128_default_nan_high; |
980 | f6a7d92a | Aurelien Jarno | # else
|
981 | f6a7d92a | Aurelien Jarno | # error Rules for silencing a signaling NaN are target-specific |
982 | f6a7d92a | Aurelien Jarno | # endif
|
983 | f6a7d92a | Aurelien Jarno | #else
|
984 | f6a7d92a | Aurelien Jarno | a.high |= LIT64( 0x0000800000000000 );
|
985 | f6a7d92a | Aurelien Jarno | return a;
|
986 | f6a7d92a | Aurelien Jarno | #endif
|
987 | f6a7d92a | Aurelien Jarno | } |
988 | f6a7d92a | Aurelien Jarno | return a;
|
989 | f6a7d92a | Aurelien Jarno | } |
990 | f6a7d92a | Aurelien Jarno | |
991 | f6a7d92a | Aurelien Jarno | /*----------------------------------------------------------------------------
|
992 | 158142c2 | bellard | | Returns the result of converting the quadruple-precision floating-point NaN
|
993 | 158142c2 | bellard | | `a' to the canonical NaN format. If `a' is a signaling NaN, the invalid
|
994 | 158142c2 | bellard | | exception is raised.
|
995 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
996 | 158142c2 | bellard | |
997 | 158142c2 | bellard | static commonNaNT float128ToCommonNaN( float128 a STATUS_PARAM)
|
998 | 158142c2 | bellard | { |
999 | 158142c2 | bellard | commonNaNT z; |
1000 | 158142c2 | bellard | |
1001 | 158142c2 | bellard | if ( float128_is_signaling_nan( a ) ) float_raise( float_flag_invalid STATUS_VAR);
|
1002 | 158142c2 | bellard | z.sign = a.high>>63;
|
1003 | 158142c2 | bellard | shortShift128Left( a.high, a.low, 16, &z.high, &z.low );
|
1004 | 158142c2 | bellard | return z;
|
1005 | 158142c2 | bellard | } |
1006 | 158142c2 | bellard | |
1007 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
1008 | 158142c2 | bellard | | Returns the result of converting the canonical NaN `a' to the quadruple-
|
1009 | 158142c2 | bellard | | precision floating-point format.
|
1010 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
1011 | 158142c2 | bellard | |
1012 | bcd4d9af | Christophe Lyon | static float128 commonNaNToFloat128( commonNaNT a STATUS_PARAM)
|
1013 | 158142c2 | bellard | { |
1014 | 158142c2 | bellard | float128 z; |
1015 | 158142c2 | bellard | |
1016 | bcd4d9af | Christophe Lyon | if ( STATUS(default_nan_mode) ) {
|
1017 | bcd4d9af | Christophe Lyon | z.low = float128_default_nan_low; |
1018 | bcd4d9af | Christophe Lyon | z.high = float128_default_nan_high; |
1019 | bcd4d9af | Christophe Lyon | return z;
|
1020 | bcd4d9af | Christophe Lyon | } |
1021 | bcd4d9af | Christophe Lyon | |
1022 | 158142c2 | bellard | shift128Right( a.high, a.low, 16, &z.high, &z.low );
|
1023 | bb98fe42 | Andreas Färber | z.high |= ( ( (uint64_t) a.sign )<<63 ) | LIT64( 0x7FFF000000000000 ); |
1024 | 158142c2 | bellard | return z;
|
1025 | 158142c2 | bellard | } |
1026 | 158142c2 | bellard | |
1027 | 158142c2 | bellard | /*----------------------------------------------------------------------------
|
1028 | 158142c2 | bellard | | Takes two quadruple-precision floating-point values `a' and `b', one of
|
1029 | 158142c2 | bellard | | which is a NaN, and returns the appropriate NaN result. If either `a' or
|
1030 | 158142c2 | bellard | | `b' is a signaling NaN, the invalid exception is raised.
|
1031 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
|
1032 | 158142c2 | bellard | |
1033 | 158142c2 | bellard | static float128 propagateFloat128NaN( float128 a, float128 b STATUS_PARAM)
|
1034 | 158142c2 | bellard | { |
1035 | d735d695 | Aurelien Jarno | flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN; |
1036 | d735d695 | Aurelien Jarno | flag aIsLargerSignificand; |
1037 | 158142c2 | bellard | |
1038 | d735d695 | Aurelien Jarno | aIsQuietNaN = float128_is_quiet_nan( a ); |
1039 | 158142c2 | bellard | aIsSignalingNaN = float128_is_signaling_nan( a ); |
1040 | d735d695 | Aurelien Jarno | bIsQuietNaN = float128_is_quiet_nan( b ); |
1041 | 158142c2 | bellard | bIsSignalingNaN = float128_is_signaling_nan( b ); |
1042 | 1f398e08 | Aurelien Jarno | |
1043 | 158142c2 | bellard | if ( aIsSignalingNaN | bIsSignalingNaN ) float_raise( float_flag_invalid STATUS_VAR);
|
1044 | 354f211b | Peter Maydell | |
1045 | 10201602 | Aurelien Jarno | if ( STATUS(default_nan_mode) ) {
|
1046 | 10201602 | Aurelien Jarno | a.low = float128_default_nan_low; |
1047 | 10201602 | Aurelien Jarno | a.high = float128_default_nan_high; |
1048 | 10201602 | Aurelien Jarno | return a;
|
1049 | 10201602 | Aurelien Jarno | } |
1050 | 10201602 | Aurelien Jarno | |
1051 | 354f211b | Peter Maydell | if (lt128(a.high<<1, a.low, b.high<<1, b.low)) { |
1052 | 354f211b | Peter Maydell | aIsLargerSignificand = 0;
|
1053 | 354f211b | Peter Maydell | } else if (lt128(b.high<<1, b.low, a.high<<1, a.low)) { |
1054 | 354f211b | Peter Maydell | aIsLargerSignificand = 1;
|
1055 | 354f211b | Peter Maydell | } else {
|
1056 | 354f211b | Peter Maydell | aIsLargerSignificand = (a.high < b.high) ? 1 : 0; |
1057 | 158142c2 | bellard | } |
1058 | 354f211b | Peter Maydell | |
1059 | d735d695 | Aurelien Jarno | if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
|
1060 | 354f211b | Peter Maydell | aIsLargerSignificand)) { |
1061 | 1f398e08 | Aurelien Jarno | return float128_maybe_silence_nan(b);
|
1062 | 354f211b | Peter Maydell | } else {
|
1063 | 1f398e08 | Aurelien Jarno | return float128_maybe_silence_nan(a);
|
1064 | 158142c2 | bellard | } |
1065 | 158142c2 | bellard | } |