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Issue 8820011: Fixing mozilla test failures regarding Math.pow. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Comments. Created 9 years ago
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1 // Copyright 2011 the V8 project authors. All rights reserved. 1 // Copyright 2011 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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2855 2855
2856 // Note that according to ECMA-262 15.8.2.13: 2856 // Note that according to ECMA-262 15.8.2.13:
2857 // Math.pow(-Infinity, 0.5) == Infinity 2857 // Math.pow(-Infinity, 0.5) == Infinity
2858 // Math.sqrt(-Infinity) == NaN 2858 // Math.sqrt(-Infinity) == NaN
2859 Label done, sqrt; 2859 Label done, sqrt;
2860 // Check base for -Infinity. According to IEEE-754, double-precision 2860 // Check base for -Infinity. According to IEEE-754, double-precision
2861 // -Infinity has the highest 12 bits set and the lowest 52 bits cleared. 2861 // -Infinity has the highest 12 bits set and the lowest 52 bits cleared.
2862 __ movq(kScratchRegister, V8_INT64_C(0xFFF0000000000000), RelocInfo::NONE); 2862 __ movq(kScratchRegister, V8_INT64_C(0xFFF0000000000000), RelocInfo::NONE);
2863 __ movq(xmm_scratch, kScratchRegister); 2863 __ movq(xmm_scratch, kScratchRegister);
2864 __ ucomisd(xmm_scratch, input_reg); 2864 __ ucomisd(xmm_scratch, input_reg);
2865 // Comparing -Infinity with NaN results in "unordered", which sets the
2866 // zero flag as if both were equal. However, it also sets the carry flag.
2865 __ j(not_equal, &sqrt, Label::kNear); 2867 __ j(not_equal, &sqrt, Label::kNear);
2868 __ j(carry, &sqrt, Label::kNear);
2866 // If input is -Infinity, return Infinity. 2869 // If input is -Infinity, return Infinity.
2867 __ xorps(input_reg, input_reg); 2870 __ xorps(input_reg, input_reg);
2868 __ subsd(input_reg, xmm_scratch); 2871 __ subsd(input_reg, xmm_scratch);
2869 __ jmp(&done, Label::kNear); 2872 __ jmp(&done, Label::kNear);
2870 2873
2871 // Square root. 2874 // Square root.
2872 __ bind(&sqrt); 2875 __ bind(&sqrt);
2873 __ xorps(xmm_scratch, xmm_scratch); 2876 __ xorps(xmm_scratch, xmm_scratch);
2874 __ addsd(input_reg, xmm_scratch); // Convert -0 to +0. 2877 __ addsd(input_reg, xmm_scratch); // Convert -0 to +0.
2875 __ sqrtsd(input_reg, input_reg); 2878 __ sqrtsd(input_reg, input_reg);
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4343 RegisterEnvironmentForDeoptimization(environment, Safepoint::kNoLazyDeopt); 4346 RegisterEnvironmentForDeoptimization(environment, Safepoint::kNoLazyDeopt);
4344 ASSERT(osr_pc_offset_ == -1); 4347 ASSERT(osr_pc_offset_ == -1);
4345 osr_pc_offset_ = masm()->pc_offset(); 4348 osr_pc_offset_ = masm()->pc_offset();
4346 } 4349 }
4347 4350
4348 #undef __ 4351 #undef __
4349 4352
4350 } } // namespace v8::internal 4353 } } // namespace v8::internal
4351 4354
4352 #endif // V8_TARGET_ARCH_X64 4355 #endif // V8_TARGET_ARCH_X64
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