Change-Id: I6366e84490883b72362f762369d7e5bccb64f02f

Added filter_selectively_vert_row2 to be ready for parallel
loopfiltering in vertical direction. This change did 2-row
filtering at a time. If 2 vertically adjacent 8x8 blocks do same
type of filtering, we can do 16-pixel filtering in parallel.

Next, we need to provide 16-pixel loopfiltering functions in c
and optimized versions for codec speedup.

Change-Id: Idf97bbdd70566e55bd30e1fd25cb8544e33291be

Add support to do 16 pixel horizontal filtering in Neon.
Nexus devices saw about 0.5% decode speed increase.

Change-Id: I2993f6c2d49f31fa74976879eeaa289fd3f4e15d

Also, clean up stylistically questionable code near my changes.

Change-Id: I92c96a274cb339b7b74174a608f94ae86aba8354

Change-Id: I67d1681c7b17661deb792c5e6a9e2014a73ff9b7

Although no mismatch was indicated for 8/16 wide sub-pixel filters
in issue 661, they had similar problems that could cause mismatch
potentially. This patch fixed calculations in HORIZx8/16
and VERTx8/16.

Change-Id: I169961c9d40a20340995b7d22aafc89ccf30bfca

Change-Id: Iadd771a33c8874f3b774923bca4da3c8fe5429ee

Change-Id: I98d750ee92ff51fb714980418ea28be3b1d0f3c6

Change-Id: Ia568f70bddc1a2b62141a0197459119ca74c22b5

Change-Id: I5556e8d1fc150be8a3e93af21900829b59a500dc

This CL fixes an overcite with the AVX2 support CL previously
merged (Change-Id: Idc03f3fca4bf2d0afd33631ea1d3caf8fc34ec29) that
prevented runtime execution of AVX2 code in WebM. 

Background:
Starting with the Sandybridge processor, the CPUID instruction was
enhanced to add various extended feature flag enumeration leaves.
Reading these leaves requires an additional input value for the CPUID
instruction which is stored in ECX. This change adds this second input
value for all ARCH_X86 and ARCH_x86_64 targets to the CPUID macros,
allowing checks of EBX bit 5 for AVX2 support. This capability will be
required moving forward to check for future processor features.

Change-Id: Ie9d872bc9ff68dad4b6578e4544e4dfd0ae26c36

Change-Id: I00a5203c8ed76c184d936fccf93d76e7c06773d3

In commit "3d50da53", the stack
pointer was modified while aligning the stack, and it needed to
be pop out at the end.

Change-Id: I062971e195f1f2ab9d0ab5fb84dcf215a0fcaa67

Patch in https://gerrit.chromium.org/gerrit/#/c/41176/
was merged into repository by mistake.

Change-Id: I235c71af26bb2d72698c8aac2301e5a7e9c5f960

There are many places in handle_inter_mode that need to restore the
dst buffer pointers, due to buffer pointer swap and early rd search
breakout. This commit wraps these operations into an inline function
for clean-up.

Change-Id: I0462e8c41c8bc3cd8db07395489cac03d8e5be54

Change-Id: I473947b5ca70b7a81151926284bff86f8555492a

This patch fixed issue 661: "Decoder produces mismatched outputs
with ssse3 enabled and disabled." In sub-pixel filters, a pixel
value was multiplied by a filter coefficient, and the results
were added up. The order of adding up these multiplications had to
be arranged carefully to prevent incorrect overflowing.

Change-Id: Id08af4200fea9e1b896fc40157b8651c2c7e80f2

Change-Id: Ifad4b0e6355ce49fcc6f470becc080e8069452ee

As it is used in encoder only.

Change-Id: I5f2a8abbe72bb18cbf6ce36a3dc7e132aeae8ec2