Reviewers: Sven Panne,
Message:
PTAL.
Description:
Skip some conditional deopts for Div/Mul when all uses are truncating.
- set "can be minus zero" flag properly so minus-zero checks are skipped
- skip "integer result?" check in division code when uses are truncating
- drive-by cleanup: consolidated computation of kCanOverflow flag for
Add/Sub
into range inference phase
BUG=v8:2132
Please review this at https://codereview.chromium.org/16741002/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files:
M src/arm/assembler-arm.cc
M src/arm/code-stubs-arm.cc
M src/arm/lithium-arm.h
M src/arm/lithium-arm.cc
M src/arm/lithium-codegen-arm.h
M src/arm/lithium-codegen-arm.cc
M src/hydrogen-instructions.h
M src/hydrogen-instructions.cc
M src/hydrogen.cc
M src/ia32/assembler-ia32.cc
M src/ia32/lithium-codegen-ia32.cc
M src/x64/lithium-codegen-x64.cc
A + test/mjsunit/regress/regress-2132.js
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