src/arm/lithium-codegen-arm.cc - Issue 10543094: Eliminate redundant smi checks

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

Issue 10543094: Eliminate redundant smi checks (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge

Patch Set: Delay SMI checks as long as possible Created 8 years, 6 months ago

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Index: src/arm/lithium-codegen-arm.cc

diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc

index 8f10008e88d933cf82c2beb77947f7b33510bffb..6446e6916cff25b591ddb0b21ed484ff23e00a44 100644

--- a/src/arm/lithium-codegen-arm.cc

+++ b/src/arm/lithium-codegen-arm.cc

@@ -2753,9 +2753,14 @@ void LCodeGen::DoLoadKeyedFastElement(LLoadKeyedFastElement* instr) {

// Check for the hole value.

if (instr->hydrogen()->RequiresHoleCheck()) {

- __ LoadRoot(scratch, Heap::kTheHoleValueRootIndex);

- __ cmp(result, scratch);

- DeoptimizeIf(eq, instr->environment());

+ if (IsFastSmiElementsKind(elements_kind())) {

+ __ tst(result, Operand(kSmiTagMask));

+ DeoptimizeIf(ne, instr->environment());

+ } else {

+ __ LoadRoot(scratch, Heap::kTheHoleValueRootIndex);

+ __ cmp(result, scratch);

+ DeoptimizeIf(eq, instr->environment());

+ }

}