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Tweak to shorten generated code in Math.pow.

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Review URL: http://codereview.chromium.org/8834007

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10189 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
yangguo@chromium.org 2011-12-07 09:44:31 +00:00
parent f6eab29d73
commit 10675502f8
2 changed files with 6 additions and 10 deletions
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8
src/ia32/code-stubs-ia32.cc
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@ -3130,11 +3130,9 @@ void MathPowStub::Generate(MacroAssembler* masm) {
__ movsd(double_scratch2, double_result); // Load double_exponent with 1.
// Get absolute value of exponent.
Label no_neg, while_true, no_multiply;
__ cmp(exponent, 0);
__ j(greater_equal, &no_neg, Label::kNear);
__ neg(exponent);
__ bind(&no_neg);
Label while_true, no_multiply;
const uint32_t kClearSignBitMask = 0x7FFFFFFF;
__ and_(exponent, Immediate(kClearSignBitMask));
__ bind(&while_true);
__ shr(exponent, 1);

8
src/x64/code-stubs-x64.cc
View File

@ -2181,11 +2181,9 @@ void MathPowStub::Generate(MacroAssembler* masm) {
__ movsd(double_scratch2, double_result); // Load double_exponent with 1.
// Get absolute value of exponent.
Label no_neg, while_true, no_multiply;
__ cmpl(scratch, Immediate(0));
__ j(positive, &no_neg, Label::kNear);
__ negl(scratch);
__ bind(&no_neg);
Label while_true, no_multiply;
const uint32_t kClearSignBitMask = 0x7FFFFFFF;
__ andl(scratch, Immediate(kClearSignBitMask));
__ bind(&while_true);
__ shrl(scratch, Immediate(1));