mips and mips64 ports LGTM. kPointerSize can NOT be kInt32Size on mips64. (I
think that is used only to support the x32 ABI variant on x64.)
I don't think that arm64 supports that either. On arm64, the Ldrsh() looks
suspicious to me, as that is doing a 16-bit load. Even on x64, when the
pointer
size is 32 bits, these fields are still 32-bits wide. But of course I'd
defer to
Rodolph or any other arm person on this.
https://codereview.chromium.org/1133933003/diff/100001/src/mips64/builtins-mips64.cc
File src/mips64/builtins-mips64.cc (right):
https://codereview.chromium.org/1133933003/diff/100001/src/mips64/builtins-mips64.cc#newcode1764
src/mips64/builtins-mips64.cc:1764: __ srl(a5, a5, 1);
A couple nits that I think are completely unimportant for this usage:
lw() will sign extend (lwu() will zero-extend). If you expect negative
numbers then your shift should be sra(). Since this is a parameter
count, it won't be negative, and it won't be close to 2^31 so I don't
think either comment applies here.
https://codereview.chromium.org/1133933003/
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