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

Issue 172133003: Harmony: optimize Math.clz32. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: reupload Created 6 years, 10 months ago
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« src/ia32/lithium-codegen-ia32.cc ('K') | « src/x64/disasm-x64.cc ('k') | src/x64/lithium-x64.h » ('j') | no next file with comments »
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Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index a94dcee2271d2efd696ea09cb3162b18cb87a44d..96ced3d9b65a35990069605c32abb5d2c7afa43a 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -3729,6 +3729,20 @@ void LCodeGen::DoMathLog(LMathLog* instr) {
}
+void LCodeGen::DoMathClz32(LMathClz32* instr) {
+ Register input = ToRegister(instr->value());
+ Register result = ToRegister(instr->result());
+ Label not_zero_input;
+ __ bsrl(result, input);
+
+ __ j(not_zero, &not_zero_input);
+ __ Set(result, 63); // 64^31 == 32
Sven Panne 2014/02/19 13:24:08 63^31=32
+
+ __ bind(&not_zero_input);
+ __ xorl(result, Immediate(31)); // for x in [0..31], 31^x == 31-x.
+}
+
+
void LCodeGen::DoInvokeFunction(LInvokeFunction* instr) {
ASSERT(ToRegister(instr->context()).is(rsi));
ASSERT(ToRegister(instr->function()).is(rdi));
« src/ia32/lithium-codegen-ia32.cc ('K') | « src/x64/disasm-x64.cc ('k') | src/x64/lithium-x64.h » ('j') | no next file with comments »

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