Reviewers: Benedikt Meurer, ulan,
Description:
[turbofan] Prefer add/shift over madd on ARM64
Before selecting multiply-accumulate for a multiplication with add
operation,
check that the multiply can't be reduced to add-with-shift. This prevents
simple multiplications by 3, 5, etc turning into register moves and madd
instructions.
BUG=
Please review this at https://codereview.chromium.org/1180863002/
Base URL: https://chromium.googlesource.com/v8/v8.git@master
Affected files (+280, -52 lines):
M src/compiler/arm64/instruction-selector-arm64.cc
M test/unittests/compiler/arm64/instruction-selector-arm64-unittest.cc
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