NEON optimizations for GrayAlpha -> RGBA/BGRA Premul/Unpremul

NEON optimizations for GrayAlpha -> RGBA/BGRA Premul/Unpremul

PNG Decode Time Nexus 6P (for a test set of GrayAlpha encoded PNGs)
Regular   Unpremul 0.91x
Zero Init Unpremul 0.92x
Regular   Premul   0.84x
Zero Init Premul   0.86x

BUG=skia:4767
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1663623002
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot

Committed: https://skia.googlesource.com/skia/+/1e06079b259d1091b735492b2f71d9897c14c608

[msarett, 2016-02-03 00:17:38]

Description was changed from

==========
NEON optimizations for GrayAlpha -> RGBA/BGRA Premul/Unpremul



BUG=skia:4767
==========

to

==========
NEON optimizations for GrayAlpha -> RGBA/BGRA Premul/Unpremul



BUG=skia:4767
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
==========

[msarett, 2016-02-03 00:33:19]

Description was changed from

==========
NEON optimizations for GrayAlpha -> RGBA/BGRA Premul/Unpremul



BUG=skia:4767
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
==========

to

==========
NEON optimizations for GrayAlpha -> RGBA/BGRA Premul/Unpremul

PNG Decode Time Nexus 6P (for a test set of GrayAlpha encoded PNGs)
Regular   Unpremul 0.91x
Zero Init Unpremul 0.92x
Regular   Premul   0.84x
Zero Init Premul   0.86x

BUG=skia:4767
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
==========

[msarett, 2016-02-03 00:35:42]

msarett@google.com changed reviewers:
+ mtklein@google.com

[msarett, 2016-02-03 00:35:42]

These improvements are in addition to the speed-up from the CL that this depends
on.

SSE is coming next.

[mtklein, 2016-02-03 01:08:15]

lgtm

https://codereview.chromium.org/1663623002/diff/20001/src/opts/SkSwizzler_opts.h
File src/opts/SkSwizzler_opts.h (right):

https://codereview.chromium.org/1663623002/diff/20001/src/opts/SkSwizzler_opt...
src/opts/SkSwizzler_opts.h:346: uint8x16x2_t ga = vld2q_u8(src);
We sure are getting to use all the vldN / vstN, eh?

[msarett, 2016-02-03 14:48:52]

https://codereview.chromium.org/1663623002/diff/20001/src/opts/SkSwizzler_opts.h
File src/opts/SkSwizzler_opts.h (right):

https://codereview.chromium.org/1663623002/diff/20001/src/opts/SkSwizzler_opt...
src/opts/SkSwizzler_opts.h:346: uint8x16x2_t ga = vld2q_u8(src);
On 2016/02/03 01:08:15, mtklein wrote:
> We sure are getting to use all the vldN / vstN, eh?

Yeah it's fun to have good uses for all the instructions :)

[msarett, 2016-02-03 18:47:00]

The CQ bit was checked by msarett@google.com

[commit-bot: I haz the power, 2016-02-03 18:47:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1663623002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1663623002/20001

[commit-bot: I haz the power, 2016-02-03 19:17:47]

Description was changed from

==========
NEON optimizations for GrayAlpha -> RGBA/BGRA Premul/Unpremul

PNG Decode Time Nexus 6P (for a test set of GrayAlpha encoded PNGs)
Regular   Unpremul 0.91x
Zero Init Unpremul 0.92x
Regular   Premul   0.84x
Zero Init Premul   0.86x

BUG=skia:4767
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
==========

to

==========
NEON optimizations for GrayAlpha -> RGBA/BGRA Premul/Unpremul

PNG Decode Time Nexus 6P (for a test set of GrayAlpha encoded PNGs)
Regular   Unpremul 0.91x
Zero Init Unpremul 0.92x
Regular   Premul   0.84x
Zero Init Premul   0.86x

BUG=skia:4767
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot

Committed:
https://skia.googlesource.com/skia/+/1e06079b259d1091b735492b2f71d9897c14c608
==========

[commit-bot: I haz the power, 2016-02-03 19:17:48]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/1e06079b259d1091b735492b2f71d9897c14c608