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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 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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2987 __ mov(eax, ContextOperand(context_register(), Context::GLOBAL_OBJECT_INDEX)); | 2987 __ mov(eax, ContextOperand(context_register(), Context::GLOBAL_OBJECT_INDEX)); |
2988 __ mov(eax, FieldOperand(eax, GlobalObject::kNativeContextOffset)); | 2988 __ mov(eax, FieldOperand(eax, GlobalObject::kNativeContextOffset)); |
2989 __ mov(Operand(esp, 0), eax); | 2989 __ mov(Operand(esp, 0), eax); |
2990 __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1); | 2990 __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1); |
2991 | 2991 |
2992 // Convert 32 random bits in eax to 0.(32 random bits) in a double | 2992 // Convert 32 random bits in eax to 0.(32 random bits) in a double |
2993 // by computing: | 2993 // by computing: |
2994 // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)). | 2994 // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)). |
2995 // This is implemented on both SSE2 and FPU. | 2995 // This is implemented on both SSE2 and FPU. |
2996 if (CpuFeatures::IsSupported(SSE2)) { | 2996 if (CpuFeatures::IsSupported(SSE2)) { |
2997 CpuFeatures::Scope fscope(SSE2); | 2997 CpuFeatureScope fscope(masm(), SSE2); |
2998 __ mov(ebx, Immediate(0x49800000)); // 1.0 x 2^20 as single. | 2998 __ mov(ebx, Immediate(0x49800000)); // 1.0 x 2^20 as single. |
2999 __ movd(xmm1, ebx); | 2999 __ movd(xmm1, ebx); |
3000 __ movd(xmm0, eax); | 3000 __ movd(xmm0, eax); |
3001 __ cvtss2sd(xmm1, xmm1); | 3001 __ cvtss2sd(xmm1, xmm1); |
3002 __ xorps(xmm0, xmm1); | 3002 __ xorps(xmm0, xmm1); |
3003 __ subsd(xmm0, xmm1); | 3003 __ subsd(xmm0, xmm1); |
3004 __ movdbl(FieldOperand(edi, HeapNumber::kValueOffset), xmm0); | 3004 __ movdbl(FieldOperand(edi, HeapNumber::kValueOffset), xmm0); |
3005 } else { | 3005 } else { |
3006 // 0x4130000000000000 is 1.0 x 2^20 as a double. | 3006 // 0x4130000000000000 is 1.0 x 2^20 as a double. |
3007 __ mov(FieldOperand(edi, HeapNumber::kExponentOffset), | 3007 __ mov(FieldOperand(edi, HeapNumber::kExponentOffset), |
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4573 *stack_depth = 0; | 4573 *stack_depth = 0; |
4574 *context_length = 0; | 4574 *context_length = 0; |
4575 return previous_; | 4575 return previous_; |
4576 } | 4576 } |
4577 | 4577 |
4578 #undef __ | 4578 #undef __ |
4579 | 4579 |
4580 } } // namespace v8::internal | 4580 } } // namespace v8::internal |
4581 | 4581 |
4582 #endif // V8_TARGET_ARCH_IA32 | 4582 #endif // V8_TARGET_ARCH_IA32 |
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