[utils] Lower kMinComplexMemCopy on 64-bit archs to 8

[utils] Lower kMinComplexMemCopy on 64-bit archs to 8

Down from 16 * kPointerSize.
Modern compilers have good inlining support for memcpy(), so our
custom C++ loop is only beneficial for very short loops (if at all).

BUG=v8:5395
Review-Url: https://codereview.chromium.org/2438583002
Cr-Commit-Position: refs/heads/master@{#43212}
Committed: https://chromium.googlesource.com/v8/v8/+/70791d0cc3350885c48e6c7fa8b61d959602eab9

[Jakob Kummerow, 2017-02-15 13:14:11]

Description was changed from

==========
[utils] Lower kMinComplexMemCopy on 64-bit archs to 16

Down from 16 * kPointerSize.
Modern compilers have good inlining support for memcpy(), so our
custom C++ loop is only beneficial for very short loops (if at all).
==========

to

==========
[utils] Lower kMinComplexMemCopy on 64-bit archs to 8

Down from 16 * kPointerSize.
Modern compilers have good inlining support for memcpy(), so our
custom C++ loop is only beneficial for very short loops (if at all).
==========

[Jakob Kummerow, 2017-02-15 13:15:00]

jkummerow@chromium.org changed reviewers:
+ cbruni@chromium.org

[Jakob Kummerow, 2017-02-15 13:15:00]

Camillo: PTAL. See discussion at
https://chromiumcodereview.appspot.com/2291773002/ for background.

Octavian: FYI.

[cbruni, 2017-02-15 13:17:40]

cbruni@google.com changed reviewers:
+ cbruni@google.com

[cbruni, 2017-02-15 13:17:41]

lgtm

[Jakob Kummerow, 2017-02-15 13:22:22]

The CQ bit was checked by jkummerow@chromium.org

[commit-bot: I haz the power, 2017-02-15 13:22:27]

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, 2017-02-15 13:22:28]

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

[commit-bot: I haz the power, 2017-02-15 13:22:29]

No L-G-T-M from a valid reviewer yet. 
CQ run can only be started by full committers or once the patch has
received an L-G-T-M from a full committer.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
Committers are members of the group "project-v8-committers".
Note that this has nothing to do with OWNERS files.

[Camillo Bruni, 2017-02-15 13:23:39]

lgtm

[Jakob Kummerow, 2017-02-15 13:23:54]

Description was changed from

==========
[utils] Lower kMinComplexMemCopy on 64-bit archs to 8

Down from 16 * kPointerSize.
Modern compilers have good inlining support for memcpy(), so our
custom C++ loop is only beneficial for very short loops (if at all).
==========

to

==========
[utils] Lower kMinComplexMemCopy on 64-bit archs to 8

Down from 16 * kPointerSize.
Modern compilers have good inlining support for memcpy(), so our
custom C++ loop is only beneficial for very short loops (if at all).

BUG=v8:5395
==========

[Jakob Kummerow, 2017-02-15 13:24:05]

The CQ bit was checked by jkummerow@chromium.org

[commit-bot: I haz the power, 2017-02-15 13:24:20]

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, 2017-02-15 13:51:43]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1487165045211480,
"parent_rev": "22e129e9b4261255bd4e24f1c1518215e928ea86", "commit_rev":
"70791d0cc3350885c48e6c7fa8b61d959602eab9"}

[commit-bot: I haz the power, 2017-02-15 13:51:48]

Description was changed from

==========
[utils] Lower kMinComplexMemCopy on 64-bit archs to 8

Down from 16 * kPointerSize.
Modern compilers have good inlining support for memcpy(), so our
custom C++ loop is only beneficial for very short loops (if at all).

BUG=v8:5395
==========

to

==========
[utils] Lower kMinComplexMemCopy on 64-bit archs to 8

Down from 16 * kPointerSize.
Modern compilers have good inlining support for memcpy(), so our
custom C++ loop is only beneficial for very short loops (if at all).

BUG=v8:5395

Review-Url: https://codereview.chromium.org/2438583002
Cr-Commit-Position: refs/heads/master@{#43212}
Committed:
https://chromium.googlesource.com/v8/v8/+/70791d0cc3350885c48e6c7fa8b61d95960...
==========

[commit-bot: I haz the power, 2017-02-15 13:51:49]

Committed patchset #3 (id:40001) as
https://chromium.googlesource.com/v8/v8/+/70791d0cc3350885c48e6c7fa8b61d95960...