https://codereview.chromium.org/167123004/diff/1/src/a64/lithium-codegen-a64.cc
File src/a64/lithium-codegen-a64.cc (right):
https://codereview.chromium.org/167123004/diff/1/src/a64/lithium-codegen-a64.cc#newcode1519
src/a64/lithium-codegen-a64.cc:1519: __ Sub(temp1,
ToRegister32(instr->size()), kPointerSize);
I'm surprised that this builds, as temp1 is X and the result of
ToRegister32, W. Use temp1.W() if you're certain that size >
kPointerSize (and thus can't be negative.)
https://codereview.chromium.org/167123004/diff/1/src/a64/lithium-codegen-a64.cc#newcode1549
src/a64/lithium-codegen-a64.cc:1549: __ SmiTag(size, x10);
I don't think you need a mov here. You can call the X() method on a
register to get its X-sized equivalent, so you could:
Register untagged_size = ToRegister32(instr->size());
__ SmiTag(size, untagged_size.X());
https://codereview.chromium.org/167123004/
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