src/x64/lithium-x64.cc - Issue 150663005: Optimize redundant HCompareMap instructions with known successors.

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

Issue 150663005: Optimize redundant HCompareMap instructions with known successors. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge

Patch Set: Created 6 years, 10 months ago

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Index: src/x64/lithium-x64.cc

diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc

index 3c9eb2d796fa1a74ba133f7b577fe5744fa4988a..666b688c92abf61b066343076bd0466b39be47e7 100644

--- a/src/x64/lithium-x64.cc

+++ b/src/x64/lithium-x64.cc

@@ -952,6 +952,9 @@ LInstruction* LChunkBuilder::DoBranch(HBranch* instr) {

LInstruction* LChunkBuilder::DoCompareMap(HCompareMap* instr) {

+ LInstruction* goto_instr = CheckElideControlInstruction(instr);

+ if (goto_instr != NULL) return goto_instr;

ASSERT(instr->value()->representation().IsTagged());

LOperand* value = UseRegisterAtStart(instr->value());

return new(zone()) LCmpMapAndBranch(value);

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