[v8-dev] ARM: Optimize truncating division and fix sim

ARM: Optimize truncating division and fix sim

Optimize code generated for DivI Lithium instruction when handling division
where the result is int32. Also, fix the ARM simulator to give the correct
answer for kMinInt / -1.

TEST=Division tests added to test-assembler-arm.cc
BUG=
R=ulan@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=18445

[m.m.capewell, 2013-12-10 14:59:40]

This patch reintroduces an optimization for integer division when all uses
subsequently truncate to int32. This was removed in the fix for
http://code.google.com/p/v8/issues/detail?id=3040 .

[ulan, 2013-12-11 13:57:10]

LGTM

https://codereview.chromium.org/102623003/diff/1/test/cctest/test-assembler-a...
File test/cctest/test-assembler-arm.cc (right):

https://codereview.chromium.org/102623003/diff/1/test/cctest/test-assembler-a...
test/cctest/test-assembler-arm.cc:1486: Code::cast(code)->Print();
Is this leftover from debug?

[vincent.belliard.fr, 2013-12-11 14:20:29]

https://codereview.chromium.org/102623003/diff/1/test/cctest/test-assembler-a...
File test/cctest/test-assembler-arm.cc (right):

https://codereview.chromium.org/102623003/diff/1/test/cctest/test-assembler-a...
test/cctest/test-assembler-arm.cc:1486: Code::cast(code)->Print();
This is done in almost all the arm assembler tests.
It's always useful to see exactly what is the generated code (and furthermore,
it checks the disassembler).

[ulan, 2013-12-11 14:40:07]

https://codereview.chromium.org/102623003/diff/1/test/cctest/test-assembler-a...
File test/cctest/test-assembler-arm.cc (right):

https://codereview.chromium.org/102623003/diff/1/test/cctest/test-assembler-a...
test/cctest/test-assembler-arm.cc:1486: Code::cast(code)->Print();
On 2013/12/11 14:20:29, vincent.belliard.fr wrote:
> This is done in almost all the arm assembler tests.
> It's always useful to see exactly what is the generated code (and furthermore,
> it checks the disassembler).
OK, thanks.

[m.m.capewell, 2014-01-02 16:36:40]

Committed patchset #1 manually as r18445 (presubmit successful).