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

Issue 246423005: Improve code generation for bounds checks. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 6 years, 8 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 e82e6e8da9b8f8ad63817e11f8cf7e4ecae7da07..5b13e3978332b3d0ac0b7277467958f33a745a7e 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1789,9 +1789,16 @@ LInstruction* LChunkBuilder::DoSeqStringSetChar(HSeqStringSetChar* instr) {
LInstruction* LChunkBuilder::DoBoundsCheck(HBoundsCheck* instr) {
- LOperand* value = UseRegisterOrConstantAtStart(instr->index());
- LOperand* length = Use(instr->length());
- return AssignEnvironment(new(zone()) LBoundsCheck(value, length));
+ if (!FLAG_debug_code && instr->skip_check()) return NULL;
+ LOperand* index = UseRegisterOrConstantAtStart(instr->index());
+ LOperand* length = !index->IsConstantOperand()
+ ? UseOrConstantAtStart(instr->length())
+ : UseAtStart(instr->length());
+ LInstruction* result = new(zone()) LBoundsCheck(index, length);
+ if (!FLAG_debug_code || !instr->skip_check()) {
+ result = AssignEnvironment(result);
+ }
+ return result;
}
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