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Bug 777643 - re-enable arguments.length fast path in JM (r=bhackett)

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This commit is contained in:
Luke Wagner 2012-07-26 16:08:26 -07:00
parent 800ece8d65
commit f417d29a6c
1 changed files with 15 additions and 12 deletions
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27
js/src/methodjit/Compiler.cpp
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@ -4786,6 +4786,21 @@ mjit::Compiler::jsop_getprop(PropertyName *name, JSValueType knownType,
return true;
}
/* Handle lenth accesses of optimize 'arguments'. */
if (name == cx->runtime->atomState.lengthAtom &&
cx->typeInferenceEnabled() &&
analysis->poppedTypes(PC, 0)->isMagicArguments(cx) &&
knownPushedType(0) == JSVAL_TYPE_INT32)
{
frame.pop();
RegisterID reg = frame.allocReg();
masm.load32(Address(JSFrameReg, StackFrame::offsetOfNumActual()), reg);
frame.pushTypedPayload(JSVAL_TYPE_INT32, reg);
if (script->hasScriptCounts)
bumpPropCount(PC, PCCounts::PROP_DEFINITE);
return true;
}
if (top->mightBeType(JSVAL_TYPE_OBJECT) &&
JSOp(*PC) == JSOP_LENGTH && cx->typeInferenceEnabled() &&
!hasTypeBarriers(PC) && knownPushedType(0) == JSVAL_TYPE_INT32) {
@ -4866,18 +4881,6 @@ mjit::Compiler::jsop_getprop(PropertyName *name, JSValueType knownType,
stubcc.rejoin(Changes(1));
return true;
}
/*
* Check if we are accessing the 'length' of the lazy arguments for the
* current frame.
*/
if (types->isMagicArguments(cx)) {
frame.pop();
frame.pushWord(Address(JSFrameReg, StackFrame::offsetOfNumActual()), JSVAL_TYPE_INT32);
if (script->hasScriptCounts)
bumpPropCount(PC, PCCounts::PROP_DEFINITE);
return true;
}
}
/* If the access will definitely be fetching a particular value, nop it. */