[turbofan] Transform x * -1.0 to -0.0 - x.

[turbofan] Transform x * -1.0 to -0.0 - x.

TEST=msjunit/asm,unittests
R=jarin@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=25176

[Benedikt Meurer, 2014-11-06 05:23:11]

bmeurer@chromium.org changed reviewers:
+ jarin@chromium.org

[Benedikt Meurer, 2014-11-06 05:23:12]

PTAL

[Jarin, 2014-11-06 06:07:49]

lgtm.

https://codereview.chromium.org/683753004/diff/1/test/mjsunit/asm/float64mul.js
File test/mjsunit/asm/float64mul.js (right):

https://codereview.chromium.org/683753004/diff/1/test/mjsunit/asm/float64mul....
test/mjsunit/asm/float64mul.js:23: }
Could we possibly test the corner cases, such as -0, infinities and such?

[Benedikt Meurer, 2014-11-06 06:12:47]

https://codereview.chromium.org/683753004/diff/1/test/mjsunit/asm/float64mul.js
File test/mjsunit/asm/float64mul.js (right):

https://codereview.chromium.org/683753004/diff/1/test/mjsunit/asm/float64mul....
test/mjsunit/asm/float64mul.js:23: }
On 2014/11/06 06:07:49, jarin wrote:
> Could we possibly test the corner cases, such as -0, infinities and such?

Done.

[Benedikt Meurer, 2014-11-06 06:13:21]

Committed patchset #2 (id:20001) manually as 25176 (tree was closed).