This commit adds back sse2 or ssse3 optimized versio of a couple of
functions, fixes a ~10% performance regression.

Change-Id: I049786906e5a641224dced63c6492aec9d86d183

Code refactoring.

Change-Id: Idad53cb80497d13551a142a642f7529fc305b0bc

If the partition block is skippable, which means no coefficients
for Y, U, and V planes, its skip flag is set to 1. No quality
change (verified by borg tests), and no noticeable speed change.

Change-Id: I9231f720f8dd6364384cf05aa148ca24d75450f1

Merge "vp8/vp9: neon: msvc: move the 'ifdef _MSC_VER' bit to vpx_ports/mem.h.                      fix compiling warning."

This commit enforces ARF validation check for compound inter modes.
It avoids potential access to ARF in the encoding process if it
is not allowed.

Change-Id: I055fec946b5d19d97937dc9001e1e564923e2439

The valid reference frame check in sub8x8 rate-distortion
optimization search has been included in the ref_frame_skip_mask
scheme. This commit removes the later further validation checks
that are not in effect.

Change-Id: I853b477c44037d3dc0afec6cbfce08a96c597a75

Add vp8_mse16x16_neon.c
- vp8_mse16x16_neon
- vp8_get4x4sse_cs_neon

Change-Id: I108952f60a9ae50613f0ce3903c2c81df19d99d0
Signed-off-by: James Yu <james.yu@linaro.org>

This commit replaces the best_ref_index table fetch with the use
of best_mbmode in vp9_rd_pick_inter_mode_sub8x8.

Change-Id: I882ee9ee6a8c0e61befcca1f4dba6d2ea8de8f13

Change-Id: I9b6a74bdf003b39235f14f8b5b7f3b861f6bf131

Explicit type casting to prevent warning.

Change-Id: Ib5be4ad6d4126d88f7c67d246bb085df1e813329

                     fix compiling warning.

Change-Id: If8706a9046436f704c597e4275a6810c76ba7daa

Change from VP8E_SET_NOISE_SENSITIVITY to VP9E_SET_NOISE_SENSITIVITY

Change-Id: Ia210a7029b26924e30973f0f9798a338e0412407

The code covers both x->skip=0 & x->skip=1 cases.

Change-Id: I09745c10e5994dc700ae4c01b4b62979cdaf3306

Change-Id: I4c35ed2de8b54751b69f4801454a1ccc35b500b0

When a reference frame type is not in the frame buffer, the mode
search threshold will be set to INT_MAX, so as to effectively
turn off the mode entries in the rate-distortion optimization loop
that involves this reference frame type. This operation is now
integrated in the ref_frame_skip_mask scheme. This commit hence
removes the redundant mode search threshold setting.

Change-Id: Ib18f45da611afda2af275201efd367df7f5101ab

This commit unifies the reference frame control in the rate-
distortion optimization search loop of sub8x8 block size to remove
the control dependency on mode search order.

Change-Id: I3a174099f71a7cc176ede9fd60e2374243ae9232

Change-Id: If8cd3879aa2a498a2b1b97cedb88b2b3bd97f0ba

Improves function to return sad of integer pels by reusing integer
pels already visited in the smallest scale.
Turns on BIGDIA search for speed 4. Also, turns on the
first version of the pruned subpel search at this speed.

derf: -0.32% (speed 4)

Speed seems to improve by at least 5% but subject to verification.

Change-Id: Iaec8eaffd61d6237ac029e6a2a1b0a88b2a35271