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Unified Diff: src/x64/full-codegen-x64.cc

Issue 68723002: Implement Math.random() purely in JavaScript. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Comments only Created 7 years, 1 month ago
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Index: src/x64/full-codegen-x64.cc
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index d5fa5e5a7ca250543ce1645959151350f0b102cf..b0472846bdc157dbb009988286f11f4ef81e5b99 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -3273,47 +3273,6 @@ void FullCodeGenerator::EmitLog(CallRuntime* expr) {
}
-void FullCodeGenerator::EmitRandomHeapNumber(CallRuntime* expr) {
- ASSERT(expr->arguments()->length() == 0);
-
- Label slow_allocate_heapnumber;
- Label heapnumber_allocated;
-
- __ AllocateHeapNumber(rbx, rcx, &slow_allocate_heapnumber);
- __ jmp(&heapnumber_allocated);
-
- __ bind(&slow_allocate_heapnumber);
- // Allocate a heap number.
- __ CallRuntime(Runtime::kNumberAlloc, 0);
- __ movq(rbx, rax);
-
- __ bind(&heapnumber_allocated);
-
- // Return a random uint32 number in rax.
- // The fresh HeapNumber is in rbx, which is callee-save on both x64 ABIs.
- __ PrepareCallCFunction(1);
- __ movq(arg_reg_1,
- ContextOperand(context_register(), Context::GLOBAL_OBJECT_INDEX));
- __ movq(arg_reg_1,
- FieldOperand(arg_reg_1, GlobalObject::kNativeContextOffset));
- __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
-
- // Convert 32 random bits in rax to 0.(32 random bits) in a double
- // by computing:
- // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
- __ movl(rcx, Immediate(0x49800000)); // 1.0 x 2^20 as single.
- __ movd(xmm1, rcx);
- __ movd(xmm0, rax);
- __ cvtss2sd(xmm1, xmm1);
- __ xorps(xmm0, xmm1);
- __ subsd(xmm0, xmm1);
- __ movsd(FieldOperand(rbx, HeapNumber::kValueOffset), xmm0);
-
- __ movq(rax, rbx);
- context()->Plug(rax);
-}
-
-
void FullCodeGenerator::EmitSubString(CallRuntime* expr) {
// Load the arguments on the stack and call the stub.
SubStringStub stub;
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