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Signed-off-by: Rishikesh More <rishikesh.more@imgtec.com>

Add macros for load/store, slide, shift, transpose and basic arithmetic
operations required by subsequent patches.
Signed-off-by: Rishikesh More <rishikesh.more@imgtec.com>

Signed-off-by: Rishikesh More <rishikesh.more@imgtec.com>

MSA is the MIPS SIMD Architecture.

Add X264_CPU_MSA define.
Update configure to detect MIPS platform and set flags.
CPU-specific gcc options are expected through --extra-cflags.

Sample command line for mips32r5:
    ./configure --host=mipsel-linux-gnu --cross-prefix=<TOOLCHAIN>/mips-mti-linux-gnu-
    --extra-cflags="-EL -mips32r5 -msched-weight -mload-store-pairs"
Signed-off-by: Kaustubh Raste <kaustubh.raste@imgtec.com>

This is attempt to improve VBV at start of video with a lot of threads which
delay feedback for predictors.

This should improve MBTree and VBV when a lot of forced frame types are used.

For NV21 input.

Eliminates an extra copy when encoding Android camera preview images.

Checkasm test by Janne Grunau.
ARM assembly with improvements from Janne Grunau.

Enables the use of nasm as an alternative to yasm.

Note that nasm cannot assemble x264 with PIC enabled since it currently doesn't
support [symbol-$$] addressing which is used extensively by x264's PIC code.
This includes all 64-bit Windows and 64-bit OS X builds, even non-shared.

For the above reason nasm is currently intentionally not auto-detected, instead
the assembler must be explicitly specified using "AS=nasm ./configure".

Also drop -O2 from ASFLAGS since it's simply ignored anyway.

struc and endstruc attempts to revert to the previous section state set by
the SECTION macro.

Use the primitive [SECTION] directive instead of the SECTION macro for the
.note.GNU-stack section to prevent it from being emitted again during endstruc.

The .text section is already 16-byte aligned by default on all supported
platforms so `SECTION_TEXT` isn't any different from `SECTION .text`.

The bug was fixed in 1.3.0, so only perform the workaround in earlier versions.

Just for consistency, doesn't affect behavior.

PIC is always enabled when compiling for Windows so gcc complains when using
-fPIC since it doesn't do anything.

The StereoMode element is only valid with DocTypeVersion 3 or higher.

 * Fix unsigned <= 0 check.
 * Add additional size sanity check on 32-bit systems.
 * Don't read uninitialized data if fread() fails.

Patch written by Koop Mast <kwm@FreeBSD.org>

Could only occur in 4:2:2 with height == 1.

Also enable asm for inputs with different U/V strides as long as the strides
have identical signs.

Defined in 2014-02 edition.

Defined in 2013-04 edition.