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Issue 8162014: Moved random generator state to global context. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 9 years, 2 months 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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2774 __ jmp(&heapnumber_allocated); 2774 __ jmp(&heapnumber_allocated);
2775 2775
2776 __ bind(&slow_allocate_heapnumber); 2776 __ bind(&slow_allocate_heapnumber);
2777 // Allocate a heap number. 2777 // Allocate a heap number.
2778 __ CallRuntime(Runtime::kNumberAlloc, 0); 2778 __ CallRuntime(Runtime::kNumberAlloc, 0);
2779 __ mov(edi, eax); 2779 __ mov(edi, eax);
2780 2780
2781 __ bind(&heapnumber_allocated); 2781 __ bind(&heapnumber_allocated);
2782 2782
2783 __ PrepareCallCFunction(1, ebx); 2783 __ PrepareCallCFunction(1, ebx);
2784 __ mov(Operand(esp, 0), Immediate(ExternalReference::isolate_address())); 2784 __ mov(eax, ContextOperand(context_register(), Context::GLOBAL_INDEX));
2785 __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 2785 __ mov(eax, FieldOperand(eax, GlobalObject::kGlobalContextOffset));
2786 1); 2786 __ mov(Operand(esp, 0), eax);
2787 __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
2787 2788
2788 // Convert 32 random bits in eax to 0.(32 random bits) in a double 2789 // Convert 32 random bits in eax to 0.(32 random bits) in a double
2789 // by computing: 2790 // by computing:
2790 // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)). 2791 // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
2791 // This is implemented on both SSE2 and FPU. 2792 // This is implemented on both SSE2 and FPU.
2792 if (CpuFeatures::IsSupported(SSE2)) { 2793 if (CpuFeatures::IsSupported(SSE2)) {
2793 CpuFeatures::Scope fscope(SSE2); 2794 CpuFeatures::Scope fscope(SSE2);
2794 __ mov(ebx, Immediate(0x49800000)); // 1.0 x 2^20 as single. 2795 __ mov(ebx, Immediate(0x49800000)); // 1.0 x 2^20 as single.
2795 __ movd(xmm1, ebx); 2796 __ movd(xmm1, ebx);
2796 __ movd(xmm0, eax); 2797 __ movd(xmm0, eax);
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4343 *context_length = 0; 4344 *context_length = 0;
4344 return previous_; 4345 return previous_;
4345 } 4346 }
4346 4347
4347 4348
4348 #undef __ 4349 #undef __
4349 4350
4350 } } // namespace v8::internal 4351 } } // namespace v8::internal
4351 4352
4352 #endif // V8_TARGET_ARCH_IA32 4353 #endif // V8_TARGET_ARCH_IA32
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