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BUG=b/64710201

Change-Id: Ia518af5494a42e80949cf1165244fbed59606cf7

This reverts commit 8c42237b.

Because ssse3 code is used for the reference, the qcoeff and dqcoeff
reference buffers must be aligned.

Original change's description:
> quantize avx: copy 32x32 implementation
>
> Ensure avx and ssse3 stay in sync by testing them against each other.
>
> Change-Id: I699f3b48785c83260825402d7826231f475f697c

Change-Id: Ieeef11b9406964194028b0d81d84bcb63296ae06

Scale 3x3 block instead of 16x16 block in each loop.

Benefits:
1. Reduced number of different phase_scaler from 16 to 3. Optimization code
   will be smaller and faster.
2. The maximum phase_scaler drifting will be reduced from 5/16 to 1/24.
   (The drifting is 1/(3*16) in each step.)

BUG=webm:1419

Change-Id: Ibb9242a629ddb03e1ff93b859bece738255e698c

Load the specific destination loads instead of vector load

Change-Id: I65ca13ae8f608fad07121fef848e2a18f54171fe

BUG=webm:1419

Change-Id: If82a93935d2453e61b7647aae70983db1740bec7

C vs SSE2 speed gains:
_4x4 : ~2.31x

C vs SSSE3 speed gains:
_8x8 : ~4.73x
_16x16 : ~10.88x
_32x32 : ~4.80x

BUG=webm:1411

Change-Id: I0bac29db261079181ddabc6814bd62c463109caf

1. vp8_loop_filter_horizontal_edge_mmi
2. vp8_loop_filter_vertical_edge_mmi
3. vp8_mbloop_filter_horizontal_edge_mmi
4. vp8_mbloop_filter_vertical_edge_mmi
5. vp8_loop_filter_simple_horizontal_edge_mmi
6. vp8_loop_filter_simple_vertical_edge_mmi

Change-Id: Ie34bbff3a16cff64e39a50798afd2b7dac9bcdc3

8/16/32: ~6%/~18%/~33% faster

previously:
7012ba63 vp9_reconintra: simplify d63_predictor

BUG=webm:1411

Change-Id: Ie775f3a4f7fd74df44754e65686d826a51c2cdc2

Change-Id: Ibb2cab930c95836e6d6e66300c33e7d08e4474d4

8/16/32:: ~19%/~54%/~75.5% faster

previously:
acc481ea vp9_reconintra: simplify d45_predictor

BUG=webm:1411

Change-Id: Ie8340b0c5070ae640f124733f025e4e749b660d8

* changes:
  Update convolve functions' assertions
  Add 2 to 1 scaling NEON optimization

fixes visual studio error

Change-Id: I86206f17ca951b15e247c1b92561847d8c21ec7a

So that 4 to 1 frame scaling can call them.

Change-Id: I9ec438aa63b923ba164ad3c59d7ecfa12789eab5

BUG=webm:1419

Change-Id: I99c954ffa50a62ccff2c4ab54162916141826d9b

Change-Id: I4ac576875c91fee7cb150d298fae4a2c156d374c

Move class VpxScaleBase to new file test/vpx_scale_test.h.
Add new file test/vp9_scale_test.cc with ScaleFrameTest.

BUG=webm:1419

Change-Id: Iec2098eafcef99b94047de525e5da47bcab519c1

This header doesn't build on g++ v6 as it's a C and not C++ header
(_Atomic is not a keyword in C++11). Since the C and C++ invocations
cannot be guaranteed to point to the same underlying atomic_int
implementation, remove support for them and use compiler intrinsics
instead.

BUG=webm:1461

Change-Id: Ie1cd6759c258042efc87f51f036b9aa53e4ea9d5

so that the convolve functions are independent of table alignment.

Change-Id: Ieab132a30d72c6e75bbe9473544fbe2cf51541ee

C vs SSE2 speed gains:
_4x4 : ~7.64x
_8x8 : ~16.60x
_16x16 : ~8.15x
_32x32 : ~5.05x

BUG=webm:1411

Change-Id: If165d419711cfda901bd428a05ca1560a009e62e

1. vp8_sixtap_predict16x16_mmi
2. vp8_sixtap_predict8x8_mmi
3. vp8_sixtap_predict8x4_mmi
4. vp8_sixtap_predict4x4_mmi

Change-Id: I186669d1a1d998a0f3ba3a548e25eee8b52c251b

1. vpx_sadWxH_c
2. vpx_sadWxH_avg_c
3. vpx_sadWxHx3_c
4. vpx_sadWxHx8_c
5. vpx_sadWxHx4d_c

Change-Id: Ie13161e3d73a052ea6ea7bac9cfadf55598fea7a

fixes test file builds

Change-Id: Iaa725ad95d56cf77d9fef8994981a80102e9a966

Change-Id: If4c3e8a396d0fcb304f407b44e28cac3219f038c

based on Google style with the following differences:

3a4
> # Generated with clang-format 4.0.1
13c14
< AllowShortCaseLabelsOnASingleLine: false
---
> AllowShortCaseLabelsOnASingleLine: true
23c24
< BraceWrapping:
---
> BraceWrapping:
43c44
< ConstructorInitializerAllOnOneLineOrOnePerLine: true
---
> ConstructorInitializerAllOnOneLineOrOnePerLine: false
46,47c47,48
< Cpp11BracedListStyle: true
< DerivePointerAlignment: true
---
> Cpp11BracedListStyle: false
> DerivePointerAlignment: false
51c52
< IncludeCategories:
---
> IncludeCategories:
78c79
< PointerAlignment: Left
---
> PointerAlignment: Right
80c81
< SortIncludes:    true
---
> SortIncludes:    false

Change-Id: Ibc0ef87a516b8eae88d426dfdd7624be57e7b87c

Makes main thread wait for the filter level to be picked to avoid a race
between the LPF thread and update_reference_frames(). This also
re-enables the failing tests under thread_sanitizer where this data race
was detected.

BUG=webm:1460

Change-Id: I7f5797142ea0200394309842ce3e91a480be4fbc

Fixes issue on iPad Pro 10.5 (and probably other places) where threads
are not properly synchronized. On x86 this data race was benign as load
and store instructions are atomic, they were being atomic in practice as
the program hasn't been observed to be miscompiled.

Such guarantees are not made outside x86, and real problems manifested
where libvpx reliably reproduced a broken bitstream for even just the
initial keyframe. This was detected in WebRTC where this device started
using multithreading (as its CPU count is higher than earlier devices,
where the problem did not manifest as single-threading was used in
practice).

This issue was not detected under thread-sanitizer bots as mutexes were
conditionally used under this platform to simulate the protected read
and write semantics that were in practice provided on x86 platforms.

This change also removes several mutexes, so encoder/decoder state is
lighter-weight after this change and we do not need to initialize so
many mutexes (this was done even on non-thread-sanitizer platforms where
they were unused).

Change-Id: If41fcb0d99944f7bbc8ec40877cdc34d672ae72a