Reviewers: ulan, jochen (OOO Wed-Thu),
Description:
ARM64: Sign extension on MemOperand for keyed ops
SXTW extend mode is usually cheaper on loads and stores than arithmetic,
so move it to the memory accesses where possible for Keyed loads and
stores.
BUG=
Please review this at https://codereview.chromium.org/268483002/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files (+110, -80 lines):
M src/arm64/assembler-arm64.h
M src/arm64/assembler-arm64-inl.h
M src/arm64/lithium-arm64.cc
M src/arm64/lithium-codegen-arm64.h
M src/arm64/lithium-codegen-arm64.cc
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