root / fpu / softfloat-native.c @ c5d6edc3
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1 | 158142c2 | bellard | /* Native implementation of soft float functions. Only a single status
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2 | 158142c2 | bellard | context is supported */
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3 | 158142c2 | bellard | #include "softfloat.h" |
4 | 158142c2 | bellard | #include <math.h> |
5 | 158142c2 | bellard | |
6 | 158142c2 | bellard | void set_float_rounding_mode(int val STATUS_PARAM) |
7 | 158142c2 | bellard | { |
8 | 158142c2 | bellard | STATUS(float_rounding_mode) = val; |
9 | 158142c2 | bellard | #if defined(_BSD) && !defined(__APPLE__)
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10 | 158142c2 | bellard | fpsetround(val); |
11 | 158142c2 | bellard | #elif defined(__arm__)
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12 | 158142c2 | bellard | /* nothing to do */
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13 | 158142c2 | bellard | #else
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14 | 158142c2 | bellard | fesetround(val); |
15 | 158142c2 | bellard | #endif
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16 | 158142c2 | bellard | } |
17 | 158142c2 | bellard | |
18 | 158142c2 | bellard | #ifdef FLOATX80
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19 | 158142c2 | bellard | void set_floatx80_rounding_precision(int val STATUS_PARAM) |
20 | 158142c2 | bellard | { |
21 | 158142c2 | bellard | STATUS(floatx80_rounding_precision) = val; |
22 | 158142c2 | bellard | } |
23 | 158142c2 | bellard | #endif
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24 | 158142c2 | bellard | |
25 | 158142c2 | bellard | #if defined(_BSD)
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26 | 1b2b0af5 | bellard | #define lrint(d) ((long)rint(d)) |
27 | 1b2b0af5 | bellard | #define llrint(d) ((long long)rint(d)) |
28 | 158142c2 | bellard | #endif
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29 | 158142c2 | bellard | |
30 | 158142c2 | bellard | #if defined(__powerpc__)
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31 | 158142c2 | bellard | |
32 | 158142c2 | bellard | /* correct (but slow) PowerPC rint() (glibc version is incorrect) */
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33 | 158142c2 | bellard | double qemu_rint(double x) |
34 | 158142c2 | bellard | { |
35 | 158142c2 | bellard | double y = 4503599627370496.0; |
36 | 158142c2 | bellard | if (fabs(x) >= y)
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37 | 158142c2 | bellard | return x;
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38 | 158142c2 | bellard | if (x < 0) |
39 | 158142c2 | bellard | y = -y; |
40 | 158142c2 | bellard | y = (x + y) - y; |
41 | 158142c2 | bellard | if (y == 0.0) |
42 | 158142c2 | bellard | y = copysign(y, x); |
43 | 158142c2 | bellard | return y;
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44 | 158142c2 | bellard | } |
45 | 158142c2 | bellard | |
46 | 158142c2 | bellard | #define rint qemu_rint
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47 | 158142c2 | bellard | #endif
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48 | 158142c2 | bellard | |
49 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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50 | 158142c2 | bellard | | Software IEC/IEEE integer-to-floating-point conversion routines.
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51 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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52 | 158142c2 | bellard | float32 int32_to_float32(int v STATUS_PARAM)
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53 | 158142c2 | bellard | { |
54 | 158142c2 | bellard | return (float32)v;
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55 | 158142c2 | bellard | } |
56 | 158142c2 | bellard | |
57 | 158142c2 | bellard | float64 int32_to_float64(int v STATUS_PARAM)
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58 | 158142c2 | bellard | { |
59 | 158142c2 | bellard | return (float64)v;
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60 | 158142c2 | bellard | } |
61 | 158142c2 | bellard | |
62 | 158142c2 | bellard | #ifdef FLOATX80
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63 | 158142c2 | bellard | floatx80 int32_to_floatx80(int v STATUS_PARAM)
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64 | 158142c2 | bellard | { |
65 | 158142c2 | bellard | return (floatx80)v;
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66 | 158142c2 | bellard | } |
67 | 158142c2 | bellard | #endif
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68 | 158142c2 | bellard | float32 int64_to_float32( int64_t v STATUS_PARAM) |
69 | 158142c2 | bellard | { |
70 | 158142c2 | bellard | return (float32)v;
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71 | 158142c2 | bellard | } |
72 | 158142c2 | bellard | float64 int64_to_float64( int64_t v STATUS_PARAM) |
73 | 158142c2 | bellard | { |
74 | 158142c2 | bellard | return (float64)v;
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75 | 158142c2 | bellard | } |
76 | 158142c2 | bellard | #ifdef FLOATX80
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77 | 158142c2 | bellard | floatx80 int64_to_floatx80( int64_t v STATUS_PARAM) |
78 | 158142c2 | bellard | { |
79 | 158142c2 | bellard | return (floatx80)v;
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80 | 158142c2 | bellard | } |
81 | 158142c2 | bellard | #endif
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82 | 158142c2 | bellard | |
83 | 1b2b0af5 | bellard | /* XXX: this code implements the x86 behaviour, not the IEEE one. */
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84 | 1b2b0af5 | bellard | #if HOST_LONG_BITS == 32 |
85 | 1b2b0af5 | bellard | static inline int long_to_int32(long a) |
86 | 1b2b0af5 | bellard | { |
87 | 1b2b0af5 | bellard | return a;
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88 | 1b2b0af5 | bellard | } |
89 | 1b2b0af5 | bellard | #else
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90 | 1b2b0af5 | bellard | static inline int long_to_int32(long a) |
91 | 1b2b0af5 | bellard | { |
92 | 1b2b0af5 | bellard | if (a != (int32_t)a)
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93 | 1b2b0af5 | bellard | a = 0x80000000;
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94 | 1b2b0af5 | bellard | return a;
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95 | 1b2b0af5 | bellard | } |
96 | 1b2b0af5 | bellard | #endif
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97 | 1b2b0af5 | bellard | |
98 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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99 | 158142c2 | bellard | | Software IEC/IEEE single-precision conversion routines.
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100 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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101 | 158142c2 | bellard | int float32_to_int32( float32 a STATUS_PARAM)
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102 | 158142c2 | bellard | { |
103 | 1b2b0af5 | bellard | return long_to_int32(lrintf(a));
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104 | 158142c2 | bellard | } |
105 | 158142c2 | bellard | int float32_to_int32_round_to_zero( float32 a STATUS_PARAM)
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106 | 158142c2 | bellard | { |
107 | 158142c2 | bellard | return (int)a; |
108 | 158142c2 | bellard | } |
109 | 158142c2 | bellard | int64_t float32_to_int64( float32 a STATUS_PARAM) |
110 | 158142c2 | bellard | { |
111 | 158142c2 | bellard | return llrintf(a);
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112 | 158142c2 | bellard | } |
113 | 158142c2 | bellard | |
114 | 158142c2 | bellard | int64_t float32_to_int64_round_to_zero( float32 a STATUS_PARAM) |
115 | 158142c2 | bellard | { |
116 | 158142c2 | bellard | return (int64_t)a;
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117 | 158142c2 | bellard | } |
118 | 158142c2 | bellard | |
119 | 158142c2 | bellard | float64 float32_to_float64( float32 a STATUS_PARAM) |
120 | 158142c2 | bellard | { |
121 | 158142c2 | bellard | return a;
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122 | 158142c2 | bellard | } |
123 | 158142c2 | bellard | #ifdef FLOATX80
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124 | 158142c2 | bellard | floatx80 float32_to_floatx80( float32 a STATUS_PARAM) |
125 | 158142c2 | bellard | { |
126 | 158142c2 | bellard | return a;
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127 | 158142c2 | bellard | } |
128 | 158142c2 | bellard | #endif
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129 | 158142c2 | bellard | |
130 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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131 | 158142c2 | bellard | | Software IEC/IEEE single-precision operations.
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132 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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133 | 158142c2 | bellard | float32 float32_round_to_int( float32 a STATUS_PARAM) |
134 | 158142c2 | bellard | { |
135 | 158142c2 | bellard | return rintf(a);
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136 | 158142c2 | bellard | } |
137 | 158142c2 | bellard | |
138 | b109f9f8 | bellard | float32 float32_rem( float32 a, float32 b STATUS_PARAM) |
139 | b109f9f8 | bellard | { |
140 | b109f9f8 | bellard | return remainderf(a, b);
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141 | b109f9f8 | bellard | } |
142 | b109f9f8 | bellard | |
143 | 158142c2 | bellard | float32 float32_sqrt( float32 a STATUS_PARAM) |
144 | 158142c2 | bellard | { |
145 | 158142c2 | bellard | return sqrtf(a);
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146 | 158142c2 | bellard | } |
147 | b109f9f8 | bellard | char float32_compare( float32 a, float32 b STATUS_PARAM )
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148 | b109f9f8 | bellard | { |
149 | b109f9f8 | bellard | if (a < b) {
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150 | b109f9f8 | bellard | return -1; |
151 | b109f9f8 | bellard | } else if (a == b) { |
152 | b109f9f8 | bellard | return 0; |
153 | b109f9f8 | bellard | } else if (a > b) { |
154 | b109f9f8 | bellard | return 1; |
155 | b109f9f8 | bellard | } else {
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156 | b109f9f8 | bellard | return 2; |
157 | b109f9f8 | bellard | } |
158 | b109f9f8 | bellard | } |
159 | b109f9f8 | bellard | char float32_compare_quiet( float32 a, float32 b STATUS_PARAM )
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160 | b109f9f8 | bellard | { |
161 | b109f9f8 | bellard | if (isless(a, b)) {
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162 | b109f9f8 | bellard | return -1; |
163 | b109f9f8 | bellard | } else if (a == b) { |
164 | b109f9f8 | bellard | return 0; |
165 | b109f9f8 | bellard | } else if (isgreater(a, b)) { |
166 | b109f9f8 | bellard | return 1; |
167 | b109f9f8 | bellard | } else {
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168 | b109f9f8 | bellard | return 2; |
169 | b109f9f8 | bellard | } |
170 | b109f9f8 | bellard | } |
171 | 158142c2 | bellard | char float32_is_signaling_nan( float32 a1)
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172 | 158142c2 | bellard | { |
173 | 158142c2 | bellard | float32u u; |
174 | 158142c2 | bellard | uint32_t a; |
175 | 158142c2 | bellard | u.f = a1; |
176 | 158142c2 | bellard | a = u.i; |
177 | 158142c2 | bellard | return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF ); |
178 | 158142c2 | bellard | } |
179 | 158142c2 | bellard | |
180 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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181 | 158142c2 | bellard | | Software IEC/IEEE double-precision conversion routines.
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182 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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183 | 158142c2 | bellard | int float64_to_int32( float64 a STATUS_PARAM)
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184 | 158142c2 | bellard | { |
185 | 1b2b0af5 | bellard | return long_to_int32(lrint(a));
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186 | 158142c2 | bellard | } |
187 | 158142c2 | bellard | int float64_to_int32_round_to_zero( float64 a STATUS_PARAM)
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188 | 158142c2 | bellard | { |
189 | 158142c2 | bellard | return (int)a; |
190 | 158142c2 | bellard | } |
191 | 158142c2 | bellard | int64_t float64_to_int64( float64 a STATUS_PARAM) |
192 | 158142c2 | bellard | { |
193 | 158142c2 | bellard | return llrint(a);
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194 | 158142c2 | bellard | } |
195 | 158142c2 | bellard | int64_t float64_to_int64_round_to_zero( float64 a STATUS_PARAM) |
196 | 158142c2 | bellard | { |
197 | 158142c2 | bellard | return (int64_t)a;
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198 | 158142c2 | bellard | } |
199 | 158142c2 | bellard | float32 float64_to_float32( float64 a STATUS_PARAM) |
200 | 158142c2 | bellard | { |
201 | 158142c2 | bellard | return a;
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202 | 158142c2 | bellard | } |
203 | 158142c2 | bellard | #ifdef FLOATX80
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204 | 158142c2 | bellard | floatx80 float64_to_floatx80( float64 a STATUS_PARAM) |
205 | 158142c2 | bellard | { |
206 | 158142c2 | bellard | return a;
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207 | 158142c2 | bellard | } |
208 | 158142c2 | bellard | #endif
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209 | 158142c2 | bellard | #ifdef FLOAT128
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210 | 158142c2 | bellard | float128 float64_to_float128( float64 a STATUS_PARAM) |
211 | 158142c2 | bellard | { |
212 | 158142c2 | bellard | return a;
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213 | 158142c2 | bellard | } |
214 | 158142c2 | bellard | #endif
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215 | 158142c2 | bellard | |
216 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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217 | 158142c2 | bellard | | Software IEC/IEEE double-precision operations.
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218 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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219 | 158142c2 | bellard | float64 float64_round_to_int( float64 a STATUS_PARAM ) |
220 | 158142c2 | bellard | { |
221 | 158142c2 | bellard | #if defined(__arm__)
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222 | 158142c2 | bellard | switch(STATUS(float_rounding_mode)) {
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223 | 158142c2 | bellard | default:
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224 | 158142c2 | bellard | case float_round_nearest_even:
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225 | 158142c2 | bellard | asm("rndd %0, %1" : "=f" (a) : "f"(a)); |
226 | 158142c2 | bellard | break;
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227 | 158142c2 | bellard | case float_round_down:
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228 | 158142c2 | bellard | asm("rnddm %0, %1" : "=f" (a) : "f"(a)); |
229 | 158142c2 | bellard | break;
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230 | 158142c2 | bellard | case float_round_up:
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231 | 158142c2 | bellard | asm("rnddp %0, %1" : "=f" (a) : "f"(a)); |
232 | 158142c2 | bellard | break;
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233 | 158142c2 | bellard | case float_round_to_zero:
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234 | 158142c2 | bellard | asm("rnddz %0, %1" : "=f" (a) : "f"(a)); |
235 | 158142c2 | bellard | break;
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236 | 158142c2 | bellard | } |
237 | 158142c2 | bellard | #else
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238 | 158142c2 | bellard | return rint(a);
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239 | 158142c2 | bellard | #endif
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240 | 158142c2 | bellard | } |
241 | 158142c2 | bellard | |
242 | b109f9f8 | bellard | float64 float64_rem( float64 a, float64 b STATUS_PARAM) |
243 | b109f9f8 | bellard | { |
244 | b109f9f8 | bellard | return remainder(a, b);
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245 | b109f9f8 | bellard | } |
246 | b109f9f8 | bellard | |
247 | 158142c2 | bellard | float64 float64_sqrt( float64 a STATUS_PARAM) |
248 | 158142c2 | bellard | { |
249 | 158142c2 | bellard | return sqrt(a);
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250 | 158142c2 | bellard | } |
251 | b109f9f8 | bellard | char float64_compare( float64 a, float64 b STATUS_PARAM )
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252 | b109f9f8 | bellard | { |
253 | b109f9f8 | bellard | if (a < b) {
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254 | b109f9f8 | bellard | return -1; |
255 | b109f9f8 | bellard | } else if (a == b) { |
256 | b109f9f8 | bellard | return 0; |
257 | b109f9f8 | bellard | } else if (a > b) { |
258 | b109f9f8 | bellard | return 1; |
259 | b109f9f8 | bellard | } else {
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260 | b109f9f8 | bellard | return 2; |
261 | b109f9f8 | bellard | } |
262 | b109f9f8 | bellard | } |
263 | b109f9f8 | bellard | char float64_compare_quiet( float64 a, float64 b STATUS_PARAM )
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264 | b109f9f8 | bellard | { |
265 | b109f9f8 | bellard | if (isless(a, b)) {
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266 | b109f9f8 | bellard | return -1; |
267 | b109f9f8 | bellard | } else if (a == b) { |
268 | b109f9f8 | bellard | return 0; |
269 | b109f9f8 | bellard | } else if (isgreater(a, b)) { |
270 | b109f9f8 | bellard | return 1; |
271 | b109f9f8 | bellard | } else {
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272 | b109f9f8 | bellard | return 2; |
273 | b109f9f8 | bellard | } |
274 | b109f9f8 | bellard | } |
275 | 158142c2 | bellard | char float64_is_signaling_nan( float64 a1)
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276 | 158142c2 | bellard | { |
277 | 158142c2 | bellard | float64u u; |
278 | 158142c2 | bellard | uint64_t a; |
279 | 158142c2 | bellard | u.f = a1; |
280 | 158142c2 | bellard | a = u.i; |
281 | 158142c2 | bellard | return
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282 | 158142c2 | bellard | ( ( ( a>>51 ) & 0xFFF ) == 0xFFE ) |
283 | 158142c2 | bellard | && ( a & LIT64( 0x0007FFFFFFFFFFFF ) );
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284 | 158142c2 | bellard | |
285 | 158142c2 | bellard | } |
286 | 158142c2 | bellard | |
287 | 158142c2 | bellard | #ifdef FLOATX80
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288 | 158142c2 | bellard | |
289 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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290 | 158142c2 | bellard | | Software IEC/IEEE extended double-precision conversion routines.
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291 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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292 | 158142c2 | bellard | int floatx80_to_int32( floatx80 a STATUS_PARAM)
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293 | 158142c2 | bellard | { |
294 | 1b2b0af5 | bellard | return long_to_int32(lrintl(a));
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295 | 158142c2 | bellard | } |
296 | 158142c2 | bellard | int floatx80_to_int32_round_to_zero( floatx80 a STATUS_PARAM)
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297 | 158142c2 | bellard | { |
298 | 158142c2 | bellard | return (int)a; |
299 | 158142c2 | bellard | } |
300 | 158142c2 | bellard | int64_t floatx80_to_int64( floatx80 a STATUS_PARAM) |
301 | 158142c2 | bellard | { |
302 | 158142c2 | bellard | return llrintl(a);
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303 | 158142c2 | bellard | } |
304 | 158142c2 | bellard | int64_t floatx80_to_int64_round_to_zero( floatx80 a STATUS_PARAM) |
305 | 158142c2 | bellard | { |
306 | 158142c2 | bellard | return (int64_t)a;
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307 | 158142c2 | bellard | } |
308 | 158142c2 | bellard | float32 floatx80_to_float32( floatx80 a STATUS_PARAM) |
309 | 158142c2 | bellard | { |
310 | 158142c2 | bellard | return a;
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311 | 158142c2 | bellard | } |
312 | 158142c2 | bellard | float64 floatx80_to_float64( floatx80 a STATUS_PARAM) |
313 | 158142c2 | bellard | { |
314 | 158142c2 | bellard | return a;
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315 | 158142c2 | bellard | } |
316 | 158142c2 | bellard | |
317 | 158142c2 | bellard | /*----------------------------------------------------------------------------
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318 | 158142c2 | bellard | | Software IEC/IEEE extended double-precision operations.
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319 | 158142c2 | bellard | *----------------------------------------------------------------------------*/
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320 | 158142c2 | bellard | floatx80 floatx80_round_to_int( floatx80 a STATUS_PARAM) |
321 | 158142c2 | bellard | { |
322 | 158142c2 | bellard | return rintl(a);
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323 | 158142c2 | bellard | } |
324 | b109f9f8 | bellard | floatx80 floatx80_rem( floatx80 a, floatx80 b STATUS_PARAM) |
325 | b109f9f8 | bellard | { |
326 | b109f9f8 | bellard | return remainderl(a, b);
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327 | b109f9f8 | bellard | } |
328 | 158142c2 | bellard | floatx80 floatx80_sqrt( floatx80 a STATUS_PARAM) |
329 | 158142c2 | bellard | { |
330 | 158142c2 | bellard | return sqrtl(a);
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331 | 158142c2 | bellard | } |
332 | b109f9f8 | bellard | char floatx80_compare( floatx80 a, floatx80 b STATUS_PARAM )
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333 | b109f9f8 | bellard | { |
334 | b109f9f8 | bellard | if (a < b) {
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335 | b109f9f8 | bellard | return -1; |
336 | b109f9f8 | bellard | } else if (a == b) { |
337 | b109f9f8 | bellard | return 0; |
338 | b109f9f8 | bellard | } else if (a > b) { |
339 | b109f9f8 | bellard | return 1; |
340 | b109f9f8 | bellard | } else {
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341 | b109f9f8 | bellard | return 2; |
342 | b109f9f8 | bellard | } |
343 | b109f9f8 | bellard | } |
344 | b109f9f8 | bellard | char floatx80_compare_quiet( floatx80 a, floatx80 b STATUS_PARAM )
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345 | b109f9f8 | bellard | { |
346 | b109f9f8 | bellard | if (isless(a, b)) {
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347 | b109f9f8 | bellard | return -1; |
348 | b109f9f8 | bellard | } else if (a == b) { |
349 | b109f9f8 | bellard | return 0; |
350 | b109f9f8 | bellard | } else if (isgreater(a, b)) { |
351 | b109f9f8 | bellard | return 1; |
352 | b109f9f8 | bellard | } else {
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353 | b109f9f8 | bellard | return 2; |
354 | b109f9f8 | bellard | } |
355 | b109f9f8 | bellard | } |
356 | 158142c2 | bellard | char floatx80_is_signaling_nan( floatx80 a1)
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357 | 158142c2 | bellard | { |
358 | 158142c2 | bellard | floatx80u u; |
359 | 158142c2 | bellard | u.f = a1; |
360 | 158142c2 | bellard | return ( ( u.i.high & 0x7FFF ) == 0x7FFF ) && (bits64) ( u.i.low<<1 ); |
361 | 158142c2 | bellard | } |
362 | 158142c2 | bellard | |
363 | 158142c2 | bellard | #endif |