Reviewers: Benedikt Meurer, ulan,
Description:
ARM64: Support sign extend for add and subtract
Support sxtb and sxth extend operators on add and subtract, as we've
done for ubtx/h. This is similar to ARM support for sxtab/h.
BUG=
Please review this at https://codereview.chromium.org/1064813003/
Base URL: https://chromium.googlesource.com/v8/v8.git@master
Affected files (+168, -46 lines):
M src/compiler/arm64/code-generator-arm64.cc
M src/compiler/arm64/instruction-codes-arm64.h
M src/compiler/arm64/instruction-selector-arm64.cc
M test/unittests/compiler/arm64/instruction-selector-arm64-unittest.cc
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