https://codereview.chromium.org/16206004/diff/2001/src/hydrogen-instructions.h
File src/hydrogen-instructions.h (right):

https://codereview.chromium.org/16206004/diff/2001/src/hydrogen-instructions.h#newcode3380
src/hydrogen-instructions.h:3380: if (r.IsSmi() && CannotBothBeSmi()) {
A comment might be nice.

https://codereview.chromium.org/16206004/diff/2001/src/hydrogen.cc
File src/hydrogen.cc (right):

https://codereview.chromium.org/16206004/diff/2001/src/hydrogen.cc#newcode3475
src/hydrogen.cc:3475: !from.Equals(change->to())));
Why did you add the Equals() clause? This should already be guaranteed.
Is there extra value in the check here?

https://codereview.chromium.org/16206004/diff/2001/src/ia32/lithium-codegen-ia32.cc
File src/ia32/lithium-codegen-ia32.cc (right):

https://codereview.chromium.org/16206004/diff/2001/src/ia32/lithium-codegen-ia32.cc#newcode592
src/ia32/lithium-codegen-ia32.cc:592: HConstant* constant =
chunk_->LookupConstant(op);
why do you need to pass in the representation? Can't you get this from
op->hydrogen()->representation()?

https://codereview.chromium.org/16206004/

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