I'm not entirely sure how this snuck its way out of holger's intra pred patch.

shufps is the most underrated SSE instruction on x86.

Move calculation of b_intra out of the core residual loop and hardcode it where applicable.
Inlining cabac_mb_mvd was unnecessary and wasted tremendous amounts of code size.  Inlining only cache_mvd is faster and significantly smaller.

faster bs_write_te, port CABAC context selection optimization to CAVLC.

Since the bypass case is quite unlikely, especially when doing merged sigmap/level coding,
it's faster to use a branch than a cmov.

Also fix intra_sad_x3_16x16's use of "n" as a loop variable (broke SWAP)

range_lps>>6 ranges from 4-7, so (range_lps>>6)-4 == (range_lps>>6) & 3

Add a second chroma threshold after the DC transform.

Should slightly improve performance.

Replace PHADD with FastShuffle (more accurate naming).
This flag represents asm functions that rely on fast SSE2 shuffle units, and thus are only faster on Phenom, Nehalem, and Penryn CPUs.

palignr to avoid unaligned loads is worth it in inith, but not initv.

~10% faster hpel_filter on 64-bit Penryn.
32-bit version by Fiona Glaser.

Optimized using the DEINTB method from r1122.  ~32% faster var_16x16 on Conroe.

Optimized using the same method as in r1122.  Patch partially by Holger.
~8% faster hpel filter on 64-bit Nehalem

Heavily optimized for Core 2 and Nehalem, but performance should improve on all modern x86 CPUs.
16x16 SATD: +18% speed on K8(64bit), +22% on K10(32bit), +42% on Penryn(64bit), +44% on Nehalem(64bit), +50% on P4(32bit), +98% on Conroe(64bit)
Similar performance boosts in SATD-like functions (SA8D, hadamard_ac) and somewhat less in DCT/IDCT/SSD.
Overall performance boost is up to ~15% on 64-bit Conroe.

Also add psy-trellis to fprofile

Same as MMX 8x16 cacheline SAD, but calls SSE2 8x16 SAD in non-cacheline case.
Only Nehalem benefits from sizes smaller than 8x16, and Nehalem doesn't use cacheline functions, so no smaller versions are included.

Also remove an unused variable

Add support for no-b-adapt + pre-scenecut (patch by BugMaster)
Pre-scenecut was generally better than regular scenecut in terms of accuracy and regular scenecut didn't work in threaded mode anyways.
Add no-scenecut option (scenecut=0 is now no scenecut; previously it was -1)
Fix an incorrect bias towards P-frames near scenecuts with B-adapt 2.
Simplify pre-scenecut code.

Note this this implementation is pretty naive and should be improved
by implementing what's discussed in this ML thread:
date: Mon, Feb 2, 2009 at 6:58 PM
subject: Re: [x264-devel] [PATCH] AltiVec implementation of hadamard_ac routines

Deblocking was very slightly incorrect with partitions=all.
Bug found by BugMaster.

r1105 introduced array overflow in cbp handling

A "make distclean" is probably required after updating to this revision.

Suppress a GCC warning, fix a non-problematic array overflow, one REP->REP_RET.

Original thread:
date: Mon, Feb 9, 2009 at 9:37 PM
subject: [x264-devel] commit: Spare a vec_perm and a vec_mergeh though using a LUT of permutation vectors . (Guillaume Poirier )

This will allow simplifying vectors loads that can only load 16-bytes
aligned data (such as AltiVec).

Forgetting a %define resulted in SIGILL on 32-bit systems without SSE (e.g. Athlon XP).

Up to +0.04db with CAVLC, generally a lot less with CABAC.

Up to ~17% faster CABAC RDO, ~36% faster intra-only CABAC RDO.
Up to 7% faster overall in extreme cases.

SSSE3 version of predict_8x8_hu
SSE2 version of predict_8x8c_p
SSSE3 versions of both planar prediction functions
Optimizations to predict_16x16_p_sse2
Some unnecessary REP_RETs -> RETs.
SSE2 version of predict_8x8_vr by Holger.
SSE2 version of predict_8x8_hd.
Don't compile MMX versions of some of the pred functions on x86_64.
Remove now-useless x86_64 C versions of 4x4 pred functions.
Rewrite some of the x86_64-only C functions in asm.