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Bug 925790 - Fix Octane/V8 SETPROP performance regression from bug 918584. r=shu

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This commit is contained in:
Jan de Mooij 2013-10-11 20:24:33 +02:00
parent 2def425cd7
commit 137ae9b9e0
1 changed files with 4 additions and 2 deletions
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6
js/src/jit/IonCaches.cpp
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@ -2731,8 +2731,10 @@ CanAttachNativeSetProp(HandleObject obj, HandleId id, ConstantOrRegister val,
return SetPropertyIC::CanAttachNone;
// If the object doesn't have the property, we don't know if we can attach
// a stub to add the property until we do the VM call to add.
if (!shape)
// a stub to add the property until we do the VM call to add. If the
// property exists as a data property on the prototype, we should add
// a new, shadowing property.
if (!shape || (obj != holder && shape->hasDefaultSetter() && shape->hasSlot()))
return SetPropertyIC::MaybeCanAttachAddSlot;
if (IsCacheableSetPropCallPropertyOp(obj, holder, shape) ||