skeleton for float <-> half optimized procs

skeleton for float <-> half optimized procs

Nothing fancy yet, just calls the serial code in a loop.

I will try to folow this up with at least some of:
   - SSE2 version of serial code
   - NEON version of serial code
   - NEON version using vcvt.f32.f16/vcvt.f16.f32
   - F16C (between AVX and AVX2) version using vcvtph2ps/vcvtps2ph
The last two are fastest but need runtime detection.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1686543003

Committed: https://skia.googlesource.com/skia/+/a525cb151bb39fb6362af051f69b6d633f660fd9

[mtklein_C, 2016-02-09 14:46:40]

Description was changed from

==========
skeleton for float <-> half optimized procs

Nothing fancy yet, just calls the serial code in a loop.

I will try to folow this up with at least some of:
   - SSE2 version of serial code
   - NEON version of serial code
   - NEON version using vcvt.f32.f16/vcvt.f16.f32
   - F16C (between AVX and AVX2) version using vcvtph2ps/vcvtps2ph
The last two are fastest but need runtime detection.

BUG=skia:
==========

to

==========
skeleton for float <-> half optimized procs

Nothing fancy yet, just calls the serial code in a loop.

I will try to folow this up with at least some of:
   - SSE2 version of serial code
   - NEON version of serial code
   - NEON version using vcvt.f32.f16/vcvt.f16.f32
   - F16C (between AVX and AVX2) version using vcvtph2ps/vcvtps2ph
The last two are fastest but need runtime detection.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[mtklein_C, 2016-02-09 14:56:23]

mtklein@chromium.org changed reviewers:
+ reed@google.com

[mtklein_C, 2016-02-09 14:56:30]

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

[commit-bot: I haz the power, 2016-02-09 14:56:39]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1686543003/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1686543003/40001

[mtklein, 2016-02-09 15:20:36]

The CQ bit was checked by mtklein@google.com to run a CQ dry run

[commit-bot: I haz the power, 2016-02-09 15:20:43]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1686543003/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1686543003/60001

[reed1, 2016-02-09 15:34:50]

lgtm

[commit-bot: I haz the power, 2016-02-09 15:47:53]

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

[commit-bot: I haz the power, 2016-02-09 15:47:54]

Dry run: This issue passed the CQ dry run.

[mtklein, 2016-02-09 16:17:13]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2016-02-09 16:17:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1686543003/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1686543003/60001

[commit-bot: I haz the power, 2016-02-09 16:18:12]

Description was changed from

==========
skeleton for float <-> half optimized procs

Nothing fancy yet, just calls the serial code in a loop.

I will try to folow this up with at least some of:
   - SSE2 version of serial code
   - NEON version of serial code
   - NEON version using vcvt.f32.f16/vcvt.f16.f32
   - F16C (between AVX and AVX2) version using vcvtph2ps/vcvtps2ph
The last two are fastest but need runtime detection.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
skeleton for float <-> half optimized procs

Nothing fancy yet, just calls the serial code in a loop.

I will try to folow this up with at least some of:
   - SSE2 version of serial code
   - NEON version of serial code
   - NEON version using vcvt.f32.f16/vcvt.f16.f32
   - F16C (between AVX and AVX2) version using vcvtph2ps/vcvtps2ph
The last two are fastest but need runtime detection.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Committed:
https://skia.googlesource.com/skia/+/a525cb151bb39fb6362af051f69b6d633f660fd9
==========

[commit-bot: I haz the power, 2016-02-09 16:18:13]

Committed patchset #4 (id:60001) as
https://skia.googlesource.com/skia/+/a525cb151bb39fb6362af051f69b6d633f660fd9