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To avoid decode performance hit of 2% when running on hyperthreaded
cores.

This patch only uses the mutex's when we are running tsan.

This is safe because 32 bit operations like read and store are atomic
on all the platforms we care about. Tsan warns about race situations,
but in this case either situation ( read occurs before write or write
before read) the worst case is that we go around one extra time in the
loop.  So the ordering doesn't really matter.

That said a few other things have been tried :

for instance as per here:
webrtc/base/atomicops.h#52

In this patch they use:
__atomic_load_n(i, __ATOMIC_ACQUIRE);
__atomic_store_n(i, value, __ATOMIC_RELEASE);

This code works on gcc, clang ( replacing protected write and read), and
avoids tsan errors. Incurring no penalty in performance.  In C11 its
replaced by straight atomic operands.

However there is no equivalent in the visual studio's we support as
int32 on all windows platforms is already atomic.  To avoid tsan like
warnings on windows we'd need to use interlocked exchange and the
end result doesn't gain us any thing.

Change-Id: I2066e3c7f42641ebb23d53feb1f16f23f85bcf59

Implement vpx_post_proc_down_and_across_mb_row in NEON.
Runs about 6-7x faster than C.

BUG=webm:1320

Change-Id: Ic5c7d3552a88cfcf999ec5bf2bd46fee460642c2

The flag USE_ALTREF_FOR_ONE_PASS allows for alt-ref lookahead
in 1 pass vbr (from https://chromium-review.googlesource.com/#/c/365498).
This change is to make sure this macro flag only has effect if
the config flag cpi->oxcf.enable_auto_altef is also on.

No change in ytlive encoding, as USE_ALTREF_FOR_ONE_PASS is not
yet enabled.

Change-Id: I1a69681e4a15c5244581a3dab4587fca08f02e0f

This commit change an order of operation to avoid left shifts of
negative numbers.

Change-Id: I607c7eb91658c7a5ef397fc1504721d1b10e3dd6

Change-Id: Icc0eb9c0ddf2a13ec832877a089450972134e8ec

BUG=webm:1294

Change-Id: Ibdda54e6d1303b0f73bc7bc71417e4041d7618de

Reapply this patch:
ff0107f6 Amend and improve VP8 multithreading implementation

Amended the patch to add a unit test, and fix an asan error.

BUG=webm:851

Change-Id: I6572c03256169c64e80248bf5a5e99f59a2fc93c

Change-Id: Ie9336a808a3c3592bb4fd5d4ad3839028bfcafba

The test is disabled because of TSAN errors until we resolve
BUG=webm:851

Change-Id: I0b21c8d815bc1ea365da024b1e2ee5e1fc5715c2

Allows for use outside the idcts without pulling in idct_neon.h

Change-Id: I4a94c1af3dac3e1b5bc8296ec9eab0ddcc8cfecf

use_base_mv assumes 2x2 scaling, so fix is to shutoff
this feature unless spatial scale factors are 2.

Added svc unittest for 2 spatial layers with 5x5 scaling,
which generates the issue without this fix.

Also fix some settings in svc unittest:
let the speed setting vary (from 5 to 8), and enable static threshold.

BUG=webm:1344

Change-Id: Idfd0a6c633c21b49a0479601506302cfe974e30e

Set #threads to default 1 for all streams, change bit allocaton
for 3 temporal layers, and enable denoiser on middle resolution layer.

Change-Id: I4a57adbfdb2c319002b8f3cf359613842dc00d75

after:
2d3d95f7 enable vpx_idct16x16_256_add_neon in hbd builds

reorder INCLUDEs and fix indent of IF/ENDIFs

remove vpx_config.asm to avoid multiple symbol definitions in windows
builds and shift idct_neon.asm.S to the top to allow use of
CONFIG_VP9_HIGHBITDEPTH in the export list.

Change-Id: I0dacfbae62a6ec8fe4a26940c1a52da2dfad2029

One of the first pass stats "new_mv_count" is no longer used in VP9,
and is removed. This also makes it easy to implement a multi-threaded
first pass. This change doesn't affect the coding performance, which
has been verified by borg tests.

Change-Id: I4c7c7bf9465fda838eb230814ef0c631c068c903

Change-Id: Ie9f441245987ade9dab38af69adf4dd1fb38ca3f

1. Use correct projections when copying real dct/quant outputs.
2. Remove local random number generator and combine loops.
3. Quantization with minimum allowed step sizes instead of maximum.
   This may generate larger inputs.

Change-Id: I154afc26230c894d564671cff4b8fd5485b69598

Change-Id: Iae517017217dbacd638d40fcfeeb0f4bba7b8b8b

BUG=webm:1294

Change-Id: Ib421c150b0d29dee0a81390a612bf01a4a28cff1

* changes:
  enable vpx_idct16x16_10_add_neon in hbd builds
  idct16x16,NEON: rm output_stride from pass1 fns

BUG=webm:1294

Change-Id: Ibad079f25e673d4f5181961896a8a8333a51e825

vpx_idct16x16_256_add_neon_pass1, vpx_idct16x16_10_add_neon:
this was a constant 8 in all cases meaning the results are stored
contiguously, this allows the number of stores to be reduced.

Change-Id: I7858a0a15a284883ef45c13dfd97c308df9ea09e

Change-Id: I4ec4ad1928ec2ed87f596f52f097bc52065278dd

Use the segment weight factor based on the target (cr->percent_refresh)
if it less than the current estimate (avergae of past usage and target).
Small improvement at low bitrates.

Change-Id: Iba8fd909e203f94458901366d3a991f7ea854d49

This replaces its C version.

Change-Id: Ie39e9324305fdc0fff610ced608a037e44a85a1a

* changes:
  Add high bitdepth 4x4 idct NEON intrinsics
  Update idct x86 intrinsics to not use saturated add and sub

Change-Id: I4afc130effa05b8be2e9f982967216b1beb2ce4b

Change-Id: Iaa64d23fdb45ca1f235b0ea57e614516e548eca4

+ remove unused parameters from vpx_idct16x16_10_add_neon_pass2

Change-Id: Ie5912a4abdd308fab589380bca054a2e7234a2c4