[stubs] Fix performance regression on x64 caused by modified double hole check.

[stubs] Fix performance regression on x64 caused by modified double hole check.

Compare the whole word on 64-bit architectures with the kHoleNanInt64 value
since comparing only upper part produces slightly worse code on x64.
Currently TurboFan is not able to fold (array + ((const1 + index*scale) + const))
into single addressing mode: (array + (const + index*scale)).

BUG=chromium:645414
Committed: https://crrev.com/0dbc719bb5dcf63f9b8c6acef01c7ea07be6631d
Cr-Commit-Position: refs/heads/master@{#39335}

[Igor Sheludko, 2016-09-09 13:20:21]

ishell@chromium.org changed reviewers:
+ mvstanton@chromium.org

[Igor Sheludko, 2016-09-09 13:20:22]

I'm fixing the regression caused by this CL:
https://codereview.chromium.org/2321543003/

PTAL

[mvstanton, 2016-09-12 08:18:33]

Thanks for the fix!
LGTM.

[Igor Sheludko, 2016-09-12 08:24:19]

Description was changed from

==========
[stubs] Fix performance regression on x64 caused by modified double hole check.

Compare the whole word on 64-bit architectures with the kHoleNanInt64 value
since comparing only upper part produces slightly worse code on x64.
Currently TurboFan is not able to fold (array + ((const1 + index*scale) +
const))
into single addressing mode: (array + (const + index*scale)).

BUG=chromium:645414
==========

to

==========
[stubs] Fix performance regression on x64 caused by modified double hole check.

Compare the whole word on 64-bit architectures with the kHoleNanInt64 value
since comparing only upper part produces slightly worse code on x64.
Currently TurboFan is not able to fold (array + ((const1 + index*scale) +
const))
into single addressing mode: (array + (const + index*scale)).

BUG=chromium:645414
==========

[Igor Sheludko, 2016-09-12 08:24:23]

The CQ bit was checked by ishell@chromium.org

[commit-bot: I haz the power, 2016-09-12 08:24:28]

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 08:56:22]

Description was changed from

==========
[stubs] Fix performance regression on x64 caused by modified double hole check.

Compare the whole word on 64-bit architectures with the kHoleNanInt64 value
since comparing only upper part produces slightly worse code on x64.
Currently TurboFan is not able to fold (array + ((const1 + index*scale) +
const))
into single addressing mode: (array + (const + index*scale)).

BUG=chromium:645414
==========

to

==========
[stubs] Fix performance regression on x64 caused by modified double hole check.

Compare the whole word on 64-bit architectures with the kHoleNanInt64 value
since comparing only upper part produces slightly worse code on x64.
Currently TurboFan is not able to fold (array + ((const1 + index*scale) +
const))
into single addressing mode: (array + (const + index*scale)).

BUG=chromium:645414
==========

[commit-bot: I haz the power, 2016-09-12 08:56:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-12 08:56:54]

Description was changed from

==========
[stubs] Fix performance regression on x64 caused by modified double hole check.

Compare the whole word on 64-bit architectures with the kHoleNanInt64 value
since comparing only upper part produces slightly worse code on x64.
Currently TurboFan is not able to fold (array + ((const1 + index*scale) +
const))
into single addressing mode: (array + (const + index*scale)).

BUG=chromium:645414
==========

to

==========
[stubs] Fix performance regression on x64 caused by modified double hole check.

Compare the whole word on 64-bit architectures with the kHoleNanInt64 value
since comparing only upper part produces slightly worse code on x64.
Currently TurboFan is not able to fold (array + ((const1 + index*scale) +
const))
into single addressing mode: (array + (const + index*scale)).

BUG=chromium:645414

Committed: https://crrev.com/0dbc719bb5dcf63f9b8c6acef01c7ea07be6631d
Cr-Commit-Position: refs/heads/master@{#39335}
==========

[commit-bot: I haz the power, 2016-09-12 08:56:55]

Patchset 1 (id:??) landed as
https://crrev.com/0dbc719bb5dcf63f9b8c6acef01c7ea07be6631d
Cr-Commit-Position: refs/heads/master@{#39335}