[turbofan] Do constant folding for Float64Pow.

[turbofan] Do constant folding for Float64Pow.

Also unify the Pow implementation somewhat. There are still some
inconsistencies with the FPU version for x64/ia32, but that has
to be resolved separately.

R=ahaas@chromium.org, mvstanton@chromium.org
BUG=v8:5086
Committed: https://crrev.com/e786ef2474f6e50793df6d97e3ecd646652cf29a
Cr-Commit-Position: refs/heads/master@{#39368}

[Benedikt Meurer, 2016-09-12 10:39:49]

The CQ bit was checked by bmeurer@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-12 10:40:01]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[ahaas, 2016-09-12 10:44:12]

On 2016/09/12 at 10:39:48, bmeurer wrote:
> 

lgtm with nit.

[ahaas, 2016-09-12 10:45:24]

https://codereview.chromium.org/2333663002/diff/1/test/unittests/compiler/mac...
File test/unittests/compiler/machine-operator-reducer-unittest.cc (right):

https://codereview.chromium.org/2333663002/diff/1/test/unittests/compiler/mac...
test/unittests/compiler/machine-operator-reducer-unittest.cc:1788: 
Nit: could you add a test for x ** +-0.0 => 1.0?

[mvstanton, 2016-09-12 10:47:43]

Yay, less TODOs :P.
lgtm.

[Benedikt Meurer, 2016-09-12 10:52:03]

https://codereview.chromium.org/2333663002/diff/1/test/unittests/compiler/mac...
File test/unittests/compiler/machine-operator-reducer-unittest.cc (right):

https://codereview.chromium.org/2333663002/diff/1/test/unittests/compiler/mac...
test/unittests/compiler/machine-operator-reducer-unittest.cc:1788: 
On 2016/09/12 10:45:23, ahaas wrote:
> Nit: could you add a test for x ** +-0.0 => 1.0?

Done.

[Benedikt Meurer, 2016-09-12 10:52:07]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2016-09-12 10:52:07]

The patchset sent to the CQ was uploaded after l-g-t-m from
mvstanton@chromium.org, ahaas@chromium.org
Link to the patchset: https://codereview.chromium.org/2333663002/#ps20001
(title: "Address feedback.")

[commit-bot: I haz the power, 2016-09-12 10:52:12]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-12 11:45:32]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-12 11:45:33]

Try jobs failed on following builders:
  v8_win_nosnap_shared_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_win_nosnap_shared_rel_ng...)
  v8_win_nosnap_shared_rel_ng_triggered on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_win_nosnap_shared_rel_ng...)

[Benedikt Meurer, 2016-09-13 06:42:53]

The CQ bit was checked by bmeurer@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-13 06:43:02]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Benedikt Meurer, 2016-09-13 06:43:11]

The CQ bit was unchecked by bmeurer@chromium.org

[Benedikt Meurer, 2016-09-13 06:43:15]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2016-09-13 06:43:16]

The patchset sent to the CQ was uploaded after l-g-t-m from
mvstanton@chromium.org, ahaas@chromium.org
Link to the patchset: https://codereview.chromium.org/2333663002/#ps40001
(title: "Make sure to have exponent 0/-0 properly.")

[commit-bot: I haz the power, 2016-09-13 06:43:23]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-13 07:10:03]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-09-13 07:10:49]

Description was changed from

==========
[turbofan] Do constant folding for Float64Pow.

Also unify the Pow implementation somewhat. There are still some
inconsistencies with the FPU version for x64/ia32, but that has
to be resolved separately.

R=ahaas@chromium.org, mvstanton@chromium.org
BUG=v8:5086
==========

to

==========
[turbofan] Do constant folding for Float64Pow.

Also unify the Pow implementation somewhat. There are still some
inconsistencies with the FPU version for x64/ia32, but that has
to be resolved separately.

R=ahaas@chromium.org, mvstanton@chromium.org
BUG=v8:5086

Committed: https://crrev.com/e786ef2474f6e50793df6d97e3ecd646652cf29a
Cr-Commit-Position: refs/heads/master@{#39368}
==========

[commit-bot: I haz the power, 2016-09-13 07:10:50]

Patchset 3 (id:??) landed as
https://crrev.com/e786ef2474f6e50793df6d97e3ecd646652cf29a
Cr-Commit-Position: refs/heads/master@{#39368}