Reviewers: dcarney,
Message:
PTAL
Description:
[turbofan] Combine JSToNumber and ChangeTaggedToFloat64 for fast SMI case.
This does the following optimization during ChangeLowering:
ChangeTaggedToFloat64(JSToNumber(x)) =>
if IsSmi(x) then ChangeSmiToFloat64(x)
else let y = JSToNumber(x) in
if IsSmi(y) then ChangeSmiToFloat64(y)
else LoadHeapNumberValue(y)
Also cleanup/rearrange some code duplication in ChangeLowering.
Please review this at https://codereview.chromium.org/703103003/
Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files (+128, -58 lines):
M src/compiler/change-lowering.h
M src/compiler/change-lowering.cc
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