https://codereview.chromium.org/61623004/diff/30001/src/x64/macro-assembler-x64.cc
File src/x64/macro-assembler-x64.cc (right):
https://codereview.chromium.org/61623004/diff/30001/src/x64/macro-assembler-x64.cc#newcode956
src/x64/macro-assembler-x64.cc:956: movzxbq(dst, src);
We can safely use movzxbl() here, as all 32-bit instructions
auto-zero-extend in
long mode. Depending on src and dst this can avoid the REX prefix.
https://codereview.chromium.org/61623004/diff/30001/src/x64/macro-assembler-x64.cc#newcode960
src/x64/macro-assembler-x64.cc:960: movzxwq(dst, src);
Same.
https://codereview.chromium.org/61623004/
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