Add SkNx_cast().

Add SkNx_cast().

SkNx_cast() can cast between any of our vector types,
provided they have the same number of elements.

Any types should work with the default implementation,
and we can drop in specializations as needed, like the
SSE and NEON Sk4f -> Sk4i I included here as an example.


To make this work, I made some internal name changes:
    SkNi<N,T> -> SkNx<N, T>
    SkNf<N>   -> SkNx<N, float>
User aliases (Sk4f, Sk16b, etc.) stay the same.
We can land this first (it's PS1) if that makes things easier.


BUG=skia:
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot

Committed: https://skia.googlesource.com/skia/+/6c221b40680ff933c7b8f2ac3dfa76b5732aee3e

[mtklein, 2015-11-19 21:51:35]

Description was changed from

==========
Unify SkNi and SkNf as SkNx

No logical change here, just some naming changes:
    SkNi<N,T> -> SkNx<N, T>
    SkNf<N>   -> SkNx<N, float>

This makes it easier to work with SkNi / SkNf generically,
e.g. to write SkNx_cast().

Not much point landing this without SkNx_cast().
COMMIT=false

BUG=skia:
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
==========

to

==========
Unify SkNi and SkNf as SkNx

No logical change here, just some naming changes:
    SkNi<N,T> -> SkNx<N, T>
    SkNf<N>   -> SkNx<N, float>
User aliases (Sk4f, Sk16b, etc.) stay the same.

This makes it easier to work with SkNi / SkNf generically,
e.g. to write SkNx_cast().

Not much point landing this without SkNx_cast().
COMMIT=false

BUG=skia:
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
==========

[mtklein, 2015-11-19 21:51:40]

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

[commit-bot: I haz the power, 2015-11-19 21:51:42]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1464623002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1464623002/1

[commit-bot: I haz the power, 2015-11-19 22:07:42]

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

[commit-bot: I haz the power, 2015-11-19 22:07:43]

Dry run: This issue passed the CQ dry run.

[mtklein, 2015-11-19 22:52:31]

Description was changed from

==========
Unify SkNi and SkNf as SkNx

No logical change here, just some naming changes:
    SkNi<N,T> -> SkNx<N, T>
    SkNf<N>   -> SkNx<N, float>
User aliases (Sk4f, Sk16b, etc.) stay the same.

This makes it easier to work with SkNi / SkNf generically,
e.g. to write SkNx_cast().

Not much point landing this without SkNx_cast().
COMMIT=false

BUG=skia:
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
==========

to

==========
Add SkNx_cast().

SkNx_cast() can cast between any of our vector types,
provided they have the same number of elements.

Any types should work with the default implementation,
and we can drop in specializations as needed, like the
SSE and NEON Sk4f -> Sk4i I included here as an example.


To make this work, I made some internal name changes:
    SkNi<N,T> -> SkNx<N, T>
    SkNf<N>   -> SkNx<N, float>
User aliases (Sk4f, Sk16b, etc.) stay the same.


BUG=skia:
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
==========

[mtklein, 2015-11-19 22:52:51]

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

[commit-bot: I haz the power, 2015-11-19 22:52:57]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1464623002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1464623002/20001

[mtklein, 2015-11-19 22:53:35]

Description was changed from

==========
Add SkNx_cast().

SkNx_cast() can cast between any of our vector types,
provided they have the same number of elements.

Any types should work with the default implementation,
and we can drop in specializations as needed, like the
SSE and NEON Sk4f -> Sk4i I included here as an example.


To make this work, I made some internal name changes:
    SkNi<N,T> -> SkNx<N, T>
    SkNf<N>   -> SkNx<N, float>
User aliases (Sk4f, Sk16b, etc.) stay the same.


BUG=skia:
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
==========

to

==========
Add SkNx_cast().

SkNx_cast() can cast between any of our vector types,
provided they have the same number of elements.

Any types should work with the default implementation,
and we can drop in specializations as needed, like the
SSE and NEON Sk4f -> Sk4i I included here as an example.


To make this work, I made some internal name changes:
    SkNi<N,T> -> SkNx<N, T>
    SkNf<N>   -> SkNx<N, float>
User aliases (Sk4f, Sk16b, etc.) stay the same.
We can land this first (it's PS1) if that makes things easier.


BUG=skia:
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
==========

[mtklein_C, 2015-11-19 23:05:30]

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

[mtklein_C, 2015-11-19 23:05:30]

This should be the thing to get you going again with float <--> fixed.

[commit-bot: I haz the power, 2015-11-19 23:06:29]

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

[commit-bot: I haz the power, 2015-11-19 23:06:30]

Dry run: This issue passed the CQ dry run.

[mtklein, 2015-11-19 23:12:10]

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

[commit-bot: I haz the power, 2015-11-19 23:12:19]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1464623002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1464623002/40001

[commit-bot: I haz the power, 2015-11-19 23:26:11]

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

[commit-bot: I haz the power, 2015-11-19 23:26:12]

Dry run: This issue passed the CQ dry run.

[reed1, 2015-11-20 15:46:50]

lgtm

[mtklein, 2015-11-20 15:47:04]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-11-20 15:47:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1464623002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1464623002/40001

[commit-bot: I haz the power, 2015-11-20 21:53:23]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/6c221b40680ff933c7b8f2ac3dfa76b5732aee3e