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C vs SSE2 speed gains:
_4x4 : ~8.12x
_8x8 : ~9.71x
_16x16 : ~8.21x
_32x32 : ~5.0x

BUG=webm:1422

Change-Id: I5e8a1ed4db7b8dc539b3e2a728b0b34d8b4b1993

Rev d1477715 fixed the test failure. So remove the resolution condition
for using source_sad in speed 6.

BUG=webm:1452

Change-Id: I1efba97e1ef5bd4de5f886299f6fcb907187abcd

Enable adapt_partition for vbr mode for speed 6.
This allows the usage of the pickmode-based partition
(used in speed 5), but only selectively for superblocks
with high source sad, otherwise the faster variance based
partition scheme is used.

For speed 6 on ytlive set: avgPSNR/SSIM metrics up by ~0.6%,
several clips up by ~1.5%. Small/negligible decrease in speed.

Change-Id: I12f3efef6b3e059391de330fdbe5a44c2587f1f8

For SVC at speed >= 7: only use the improved mv search
on base spatial layer, if top layer resolution is above 640x360.

~2.3% speedup
Small/negligible loss in avgPSNR metrics on rtc set.

Change-Id: Iaef75a57ebf1c248931bc1aa28d20b7fecac1851

This reverts commit f60d1dcd.

Reason for revert: <INSERT REASONING HERE>
Failures in AVX/VP9QuantizeTest in nightly tests.
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

TBR=slavarnway@google.com,johannkoenig@google.com,builds@webmproject.org

Change-Id: Ibd38636212269328317dd0721be9d25452113d1c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true

Merge "vpx_dsp:loongson optimize vpx_varianceWxH_c,vpx_sub_pixel_varianceWxH_c and vpx_sub_pixel_avg_varianceWxH_c with mmi."

This avoids an endless build loop at vpx_version.h
creation time when diff is not present.

Change-Id: I16ae386dbdaf14f9a2b85e4c5d1aaa6c08f52a45

vpx_dsp:loongson optimize vpx_varianceWxH_c,vpx_sub_pixel_varianceWxH_c and vpx_sub_pixel_avg_varianceWxH_c with mmi.

Change-Id: Ia576a721df6312329b599c31cfe1fb1267a9f174

For speeds < 7, increase threshold that controls the split
of 16x16->8x8 blocks, for resolutions 720p and higher.

Minor change for speed 5 (since it uses reference partition scheme
which only uses variance partition as first step).
For speed 6: ~0.5% increase in avgPSNR/SSIM metrics on ytlvie set.
No change in speed.

Change-Id: I5126580973201538d8ca26a9256b93c4d11d685b

Ensure avx and ssse3 stay in sync by testing them against each other.

Change-Id: I699f3b48785c83260825402d7826231f475f697c

Still does not pass tests. Does match the previous assembly, although
saving the sign before multiplying is dubious.

Change-Id: Ia163f18c755aba542d6e93f7bf7343184660df5a

Change-Id: I1d93698bc27529b0544d79dd7b9fe37afa51ef87

Change-Id: I77be617c7d7c64929dd51c6077322f4f8ad23897

For SVC encoding:
average speedup ~1.5%, with small ~0.57 loss in avgPSNR metrics.

Change-Id: Icebce6f6ef4e819d7dfcf8db898c583167351de4

Adds an early exit based on ptest. Slightly slower than ssse3 in the
full case because of the extra check, but potentially faster if lots of
rows can be skipped.

Very close in speed to the assembly.

Can run in 32 bit, unlike the assembly. Allows reworking the function
prototype to use structs.

Change-Id: If80e2b9ba059370a4cad3c973196e82a97b4330e

Add 1 if negative to get dqcoeff to round towards zero.

10-15% faster than converting to positive before shifting.

Change-Id: I01a62fd0c9bca786b6885b318bd447bb9229903d

About 4x faster when values are below the dequant threshold and 10x
faster if everything needs to be calculated.

Both numbers would improve if the division for dqcoeff could be
simplified.

BUG=webm:1426

Change-Id: I8da67c1f3fcb4abed8751990c1afe00bc841f4b2

Change-Id: I2c782d18d9004414ba61b77238e0caf3e022d8f2

* changes:
  quantize ssse3: copy style from sse2
  quantize sse2: copy opts from ssse3

This feature is used for the CBR RTC encoding mode
at speed >= 6. This change will exclude it for VBR mode.

For speed 6 live encoding (VBR):
avgPSNR/SSIM metrics on ytlive set up by ~1% (few clips up by 2/3%).
No change in speed.

Change-Id: I1a0dd94c334f7df309ab5a48d477d7e25355b798

Change-Id: I53f8a160e640c674ea035fc112e207b6dca42598

Simplify eob calculations based on ssse3 implementation.

General clean up and re-scoping.

Change-Id: I48f282bf9bd28ee9bc2c7a6779be9d45b5a3a3ee

* changes:
  quantize: ignore skip_block in arm
  quantize: ignore skip_block in x86
  quantize fp: ignore skip_block in arm
  quantize fp: ignore skip_block in x86

This should probably be handled before vp9_regular_quantize_b_4x4 even
gets called.

Fixes an assert resulting from removing skip_block from the quantize
functions.

BUG=webm:1459

Change-Id: I7f52b53f959b4654b3d4517ebda31a678f4d0fde