X87: Turn ToNumberStub into a PlatformCodeStub again.
port b6737c56eaf51d63ab83b6529f657c15f834623c (r25187) original commit message: Turn ToNumberStub into a PlatformCodeStub again. The HydrogenCodeStub is too expensive and there's no easy way to reduce this cost, so turning it into a PlatformCodeStub solves that problem until we can use TurboFan for code stubs. BUG= R=weiliang.lin@intel.com Review URL: https://codereview.chromium.org/714573003 Patch from Chunyang Dai <chunyang.dai@intel.com>. Cr-Commit-Position: refs/heads/master@{#25227} git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25227 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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@ -2862,6 +2862,25 @@ void SubStringStub::Generate(MacroAssembler* masm) {
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}
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void ToNumberStub::Generate(MacroAssembler* masm) {
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// The ToNumber stub takes one argument in eax.
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Label check_heap_number, call_builtin;
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__ JumpIfNotSmi(eax, &check_heap_number, Label::kNear);
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__ Ret();
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__ bind(&check_heap_number);
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__ CompareMap(eax, masm->isolate()->factory()->heap_number_map());
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__ j(not_equal, &call_builtin, Label::kNear);
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__ Ret();
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__ bind(&call_builtin);
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__ pop(ecx); // Pop return address.
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__ push(eax);
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__ push(ecx); // Push return address.
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__ InvokeBuiltin(Builtins::TO_NUMBER, JUMP_FUNCTION);
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}
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void StringHelper::GenerateFlatOneByteStringEquals(MacroAssembler* masm,
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Register left,
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Register right,
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