Latest x264 code that has a lot of optimization, you can refer to

latest_x264
...........\x264-snapshot-20120425-2245
...........\...........................\.gitignore
...........\...........................\AUTHORS
...........\...........................\COPYING
...........\...........................\Makefile
...........\...........................\common
...........\...........................\......\arm
...........\...........................\......\...\asm.S
...........\...........................\......\...\cpu-a.S
...........\...........................\......\...\dct-a.S
...........\...........................\......\...\dct.h
...........\...........................\......\...\deblock-a.S
...........\...........................\......\...\mc-a.S
...........\...........................\......\...\mc-c.c
...........\...........................\......\...\mc.h
...........\...........................\......\...\pixel-a.S
...........\...........................\......\...\pixel.h
...........\...........................\......\...\predict-a.S
...........\...........................\......\...\predict-c.c
...........\...........................\......\...\predict.h
...........\...........................\......\...\quant-a.S
...........\...........................\......\...\quant.h
...........\...........................\......\bitstream.c
...........\...........................\......\bitstream.h
...........\...........................\......\cabac.c
...........\...........................\......\cabac.h
...........\...........................\......\common.c
...........\...........................\......\common.h
...........\...........................\......\cpu.c
...........\...........................\......\cpu.h
...........\...........................\......\dct.c
...........\...........................\......\dct.h
...........\...........................\......\deblock.c
...........\...........................\......\display-x11.c
...........\...........................\......\display.h
...........\...........................\......\frame.c
...........\...........................\......\frame.h
...........\...........................\......\macroblock.c
...........\...........................\......\macroblock.h
...........\...........................\......\mc.c
...........\...........................\......\mc.h
...........\...........................\......\mvpred.c
...........\...........................\......\osdep.c
...........\...........................\......\osdep.h
...........\...........................\......\pixel.c
...........\...........................\......\pixel.h
...........\...........................\......\ppc
...........\...........................\......\...\dct.c
...........\...........................\......\...\dct.h
...........\...........................\......\...\deblock.c
...........\...........................\......\...\mc.c
...........\...........................\......\...\mc.h
...........\...........................\......\...\pixel.c
...........\...........................\......\...\pixel.h
...........\...........................\......\...\ppccommon.h
...........\...........................\......\...\predict.c
...........\...........................\......\...\predict.h
...........\...........................\......\...\quant.c
...........\...........................\......\...\quant.h
...........\...........................\......\predict.c
...........\...........................\......\predict.h
...........\...........................\......\quant.c
...........\...........................\......\quant.h
...........\...........................\......\rectangle.c
...........\...........................\......\rectangle.h
...........\...........................\......\set.c
...........\...........................\......\set.h
...........\...........................\......\sparc
...........\...........................\......\.....\pixel.asm
...........\...........................\......\.....\pixel.h
...........\...........................\......\threadpool.c
...........\...........................\......\threadpool.h
...........

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