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MIPS: Eliminate Smi check when changing from Smi to Integer32

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Port r16362 (6dd68a5c)

BUG=

Review URL: https://codereview.chromium.org/23462004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16375 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
palfia@homejinni.com 2013-08-27 23:07:03 +00:00
parent 8a277a790e
commit 6d1f0cc285
1 changed files with 4 additions and 3 deletions
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7
src/mips/lithium-mips.cc
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@ -1844,11 +1844,12 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
ASSERT(to.IsInteger32());
LOperand* value = NULL;
LInstruction* res = NULL;
if (instr->value()->type().IsSmi()) {
value = UseRegisterAtStart(instr->value());
HValue* val = instr->value();
if (val->type().IsSmi() || val->representation().IsSmi()) {
value = UseRegisterAtStart(val);
res = DefineAsRegister(new(zone()) LSmiUntag(value, false));
} else {
value = UseRegister(instr->value());
value = UseRegister(val);
LOperand* temp1 = TempRegister();
LOperand* temp2 = instr->CanTruncateToInt32() ? TempRegister()
: NULL;