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Issue 10108022: Fix incorrect Math.pow() calculations on MinGW-w64. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 8 years, 8 months ago
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1 // Copyright (c) 1994-2006 Sun Microsystems Inc. 1 // Copyright (c) 1994-2006 Sun Microsystems Inc.
2 // All Rights Reserved. 2 // All Rights Reserved.
3 // 3 //
4 // Redistribution and use in source and binary forms, with or without 4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are 5 // modification, are permitted provided that the following conditions are
6 // met: 6 // met:
7 // 7 //
8 // - Redistributions of source code must retain the above copyright notice, 8 // - Redistributions of source code must retain the above copyright notice,
9 // this list of conditions and the following disclaimer. 9 // this list of conditions and the following disclaimer.
10 // 10 //
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1146 m *= m; 1146 m *= m;
1147 if ((n & 2) != 0) p *= m; 1147 if ((n & 2) != 0) p *= m;
1148 m *= m; 1148 m *= m;
1149 n >>= 2; 1149 n >>= 2;
1150 } 1150 }
1151 return p; 1151 return p;
1152 } 1152 }
1153 1153
1154 1154
1155 double power_double_double(double x, double y) { 1155 double power_double_double(double x, double y) {
1156 #ifdef __MINGW64_VERSION_MAJOR
1157 // MinGW64 has a custom implementation for pow. This handles certain
1158 // special cases that are different.
1159 if ((x == 0.0 || isinf(x)) && isfinite(y)) {
1160 double f;
1161 if (modf(y, &f) != 0.0) return ((x == 0.0) ^ (y > 0)) ? V8_INFINITY : 0;
1162 }
1163
1164 if (x == 2.0) {
1165 int y_int = static_cast<int>(y);
1166 if (y == y_int) return ldexp(1.0, y);
1167 }
1168 #endif
1169
1156 // The checks for special cases can be dropped in ia32 because it has already 1170 // The checks for special cases can be dropped in ia32 because it has already
1157 // been done in generated code before bailing out here. 1171 // been done in generated code before bailing out here.
1158 if (isnan(y) || ((x == 1 || x == -1) && isinf(y))) return OS::nan_value(); 1172 if (isnan(y) || ((x == 1 || x == -1) && isinf(y))) return OS::nan_value();
1159 return pow(x, y); 1173 return pow(x, y);
1160 } 1174 }
1161 1175
1162 1176
1163 ExternalReference ExternalReference::power_double_double_function( 1177 ExternalReference ExternalReference::power_double_double_function(
1164 Isolate* isolate) { 1178 Isolate* isolate) {
1165 return ExternalReference(Redirect(isolate, 1179 return ExternalReference(Redirect(isolate,
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1293 assembler_->RecordRelocInfo(RelocInfo::POSITION, state_.current_position); 1307 assembler_->RecordRelocInfo(RelocInfo::POSITION, state_.current_position);
1294 state_.written_position = state_.current_position; 1308 state_.written_position = state_.current_position;
1295 written = true; 1309 written = true;
1296 } 1310 }
1297 1311
1298 // Return whether something was written. 1312 // Return whether something was written.
1299 return written; 1313 return written;
1300 } 1314 }
1301 1315
1302 } } // namespace v8::internal 1316 } } // namespace v8::internal
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