[turbofan] x - y < 0 is not equivalent to x < y.

[turbofan] x - y < 0 is not equivalent to x < y.

We cannot change x - y < 0 to x < y, because it would only be safe if
x - y cannot overflow, which we don't know in general.

R=jarin@chromium.org
BUG=v8:5129
Committed: https://crrev.com/488d6e5f844c126869af09ece8aa5428d1961c25
Cr-Commit-Position: refs/heads/master@{#37164}

[Benedikt Meurer, 2016-06-22 04:06:15]

Hey Jaro,

Removing an invalid optimization from TurboFan.
Please take a look.

Thanks,
Benedikt

[Jarin, 2016-06-22 04:44:55]

lgtm

[Benedikt Meurer, 2016-06-22 04:45:20]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-06-22 04:45:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2090493002/20001

[commit-bot: I haz the power, 2016-06-22 05:35:32]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-06-22 05:38:48]

Description was changed from

==========
[turbofan] x - y < 0 is not equivalent to x < y.

We cannot change x - y < 0 to x < y, because it would only be safe if
x - y cannot overflow, which we don't know in general.

R=jarin@chromium.org
BUG=v8:5129
==========

to

==========
[turbofan] x - y < 0 is not equivalent to x < y.

We cannot change x - y < 0 to x < y, because it would only be safe if
x - y cannot overflow, which we don't know in general.

R=jarin@chromium.org
BUG=v8:5129

Committed: https://crrev.com/488d6e5f844c126869af09ece8aa5428d1961c25
Cr-Commit-Position: refs/heads/master@{#37164}
==========

[commit-bot: I haz the power, 2016-06-22 05:38:49]

Patchset 2 (id:??) landed as
https://crrev.com/488d6e5f844c126869af09ece8aa5428d1961c25
Cr-Commit-Position: refs/heads/master@{#37164}