[turbofan] ARM: Reduce out-of-line NaN code size

[turbofan] ARM: Reduce out-of-line NaN code size

Reduce the amount of code generated for OutOfLineLoadFloat* by computing
sqrt(-1) rather than move the NaN as an immediate. Add support for single
precision floating point immediate moves to enable this.

BUG=

Committed: https://crrev.com/2cd9877b6d5e299c21dd867cb0d519183d4bc7bd
Cr-Commit-Position: refs/heads/master@{#34746}

[martyn.capewell, 2016-03-03 11:18:43]

Description was changed from

==========
[turbofan] ARM: Reduce out-of-line NaN code size

Reduce the amount of code generated for OutOfLineLoadFloat* by computing
sqrt(-1) rather than move the NaN as an immediate. Add support for single
precision floating point immediate moves to enable this.

BUG=
==========

to

==========
[turbofan] ARM: Reduce out-of-line NaN code size

Reduce the amount of code generated for OutOfLineLoadFloat* by computing
sqrt(-1) rather than move the NaN as an immediate. Add support for single
precision floating point immediate moves to enable this.

BUG=
==========

[martyn.capewell, 2016-03-03 11:18:43]

martyn.capewell@arm.com changed reviewers:
+ bmeurer@chromium.org, danno@chromium.org, jarin@chromium.org

[martyn.capewell, 2016-03-03 11:27:27]

Although the replacement code to generate a NaN is slower, I can detect no
significant impact on asm.js benchmark performance on any CPU. However, it gives
single-digit percentage code size improvement in many cases, so I think this is
worthwhile.

[martyn.capewell, 2016-03-14 10:47:48]

Ping?

[Benedikt Meurer, 2016-03-14 11:09:14]

LGTM.

[martyn.capewell, 2016-03-14 14:41:58]

The CQ bit was checked by martyn.capewell@arm.com

[commit-bot: I haz the power, 2016-03-14 14:42:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1758003003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1758003003/1

[commit-bot: I haz the power, 2016-03-14 15:30:17]

Description was changed from

==========
[turbofan] ARM: Reduce out-of-line NaN code size

Reduce the amount of code generated for OutOfLineLoadFloat* by computing
sqrt(-1) rather than move the NaN as an immediate. Add support for single
precision floating point immediate moves to enable this.

BUG=
==========

to

==========
[turbofan] ARM: Reduce out-of-line NaN code size

Reduce the amount of code generated for OutOfLineLoadFloat* by computing
sqrt(-1) rather than move the NaN as an immediate. Add support for single
precision floating point immediate moves to enable this.

BUG=
==========

[commit-bot: I haz the power, 2016-03-14 15:30:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-14 15:31:08]

Description was changed from

==========
[turbofan] ARM: Reduce out-of-line NaN code size

Reduce the amount of code generated for OutOfLineLoadFloat* by computing
sqrt(-1) rather than move the NaN as an immediate. Add support for single
precision floating point immediate moves to enable this.

BUG=
==========

to

==========
[turbofan] ARM: Reduce out-of-line NaN code size

Reduce the amount of code generated for OutOfLineLoadFloat* by computing
sqrt(-1) rather than move the NaN as an immediate. Add support for single
precision floating point immediate moves to enable this.

BUG=

Committed: https://crrev.com/2cd9877b6d5e299c21dd867cb0d519183d4bc7bd
Cr-Commit-Position: refs/heads/master@{#34746}
==========

[commit-bot: I haz the power, 2016-03-14 15:31:10]

Patchset 1 (id:??) landed as
https://crrev.com/2cd9877b6d5e299c21dd867cb0d519183d4bc7bd
Cr-Commit-Position: refs/heads/master@{#34746}