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IA32: Small assembler tweak for divsd->mulsd sequence

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Review URL: https://chromiumcodereview.appspot.com/13447003

Patch from Zheng Liu <zheng.z.liu@intel.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14225 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
yangguo@chromium.org 2013-04-11 10:48:46 +00:00
parent da5c11a44a
commit 714113b22c
2 changed files with 5 additions and 0 deletions
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3
src/ia32/lithium-codegen-ia32.cc
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@ -2018,6 +2018,9 @@ void LCodeGen::DoArithmeticD(LArithmeticD* instr) {
break;
case Token::DIV:
__ divsd(left, right);
// Don't delete this mov. It may improve performance on some CPUs,
// when there is a mulsd depending on the result
__ movaps(left, left);
break;
case Token::MOD: {
// Pass two doubles as arguments on the stack.

2
src/x64/lithium-codegen-x64.cc
View File

@ -1793,6 +1793,8 @@ void LCodeGen::DoArithmeticD(LArithmeticD* instr) {
break;
case Token::DIV:
__ divsd(left, right);
// Don't delete this mov. It may improve performance on some CPUs,
// when there is a mulsd depending on the result
__ movaps(left, left);
break;
case Token::MOD: