Sorry I should make the motivation clear. I am addressing your comment at
https://codereview.chromium.org/21014003/patch/17001/18010. When I used "the
passing the stub-call label always" approach for 31-bit SMI, I found 33
fails
for this part of code as the SmiAddConstant and SmiSubConstant in the code
are
used for both SMI and HeapNumber. For 31-bit SMI, I did not check
HeapNumber,
and the result will be signed extend to 64 bit if no overflow and this
destroy
the HeapNumber. The main purpose of this CL is to make sure SmiAddConstant
and
SmiSubConstant only operate on SMI, no HeapNumber. The original code is very
clever and utilizes several facts to make the inlined SMI operation minimal
inside a loop. So I tried hard to keep the origin spirit.
If having more compact code is more important, maybe we could remove the
begging
JumpIfSmi as now ToNumberStub is a hydrogen stub, for SMI, the overhead is a
call than the current code.
https://codereview.chromium.org/22935005/
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