git.videolan.org Git - x264.git/summary

Les articles publiés sur le site

• Transparent hugepage support

  8 juillet 2013, par Henrik Gramner

  Transparent hugepage support
  
  Combine frame and mb data mallocs into a single large malloc.
  Additionally, on Linux systems with hugepage support, ask for hugepages on
  large mallocs.
  
  This gives a small performance improvement (~0.2-0.9%) on systems without
  hugepage support, as well as a small memory footprint reduction.
  
  On recent Linux kernels with hugepage support enabled (set to madvise or
  always), it improves performance up to 4% at the cost of about 7-12% more
  memory usage on typical settings..
  
  It may help even more on Haswell and other recent CPUs with improved 2MB page
  support in hardware.
  

  • [DH] common/common.c
  • [DH] common/common.h
  • [DH] common/frame.c
  • [DH] common/frame.h
  • [DH] common/macroblock.c
  • [DH] configure
  • [DH] encoder/encoder.c

• x86 : SSSE3 implementation of pixel_sad_x3 and pixel_sad_x4

  5 juillet 2013, par Henrik Gramner

  x86: SSSE3 implementation of pixel_sad_x3 and pixel_sad_x4
  

  • [DH] common/pixel.c
  • [DH] common/x86/sad-a.asm

• x86 : Faster AVX2 pixel_sad_x3 and pixel_sad_x4

  5 juillet 2013, par Henrik Gramner

  x86: Faster AVX2 pixel_sad_x3 and pixel_sad_x4
  

  • [DH] common/x86/sad-a.asm
  • [DH] encoder/me.c
  • [DH] tools/checkasm.c

• x86 : Remove X264_CPU_SSE_MISALIGN functions

  5 juillet 2013, par Henrik Gramner

  x86: Remove X264_CPU_SSE_MISALIGN functions
  
  Prevents a crash if the misaligned exception mask bit is cleared for some reason.
  
  Misaligned SSE functions are only used on AMD Phenom CPUs and the benefit is miniscule.
  They also require modifying the MXCSR control register and by removing those functions
  we can get rid of that complexity altogether.
  
  VEX-encoded instructions also supports unaligned memory operands. I tried adding AVX
  implementations of all removed functions but there were no performance improvements on
  Ivy Bridge. pixel_sad_x3 and pixel_sad_x4 had significant code size reductions though
  so I kept them and added some minor cosmetics fixes and tweaks.
  

  • [DH] common/cpu.c
  • [DH] common/cpu.h
  • [DH] common/pixel.c
  • [DH] common/x86/cpu-a.asm
  • [DH] common/x86/mc-a.asm
  • [DH] common/x86/mc-a2.asm
  • [DH] common/x86/mc-c.c
  • [DH] common/x86/pixel.h
  • [DH] common/x86/sad-a.asm
  • [DH] common/x86/x86inc.asm
  • [DH] encoder/encoder.c
  • [DH] encoder/lookahead.c
  • [DH] tools/checkasm.c
  • [DH] x264.h

• Interface : if vbv-maxrate bitrate, set bitrate = vbv-maxrate

  27 juin 2013, par Jason Garrett-Glaser

  Interface: if vbv-maxrate < bitrate, set bitrate = vbv-maxrate
  
  This probably makes more sense to the user than setting vbv-maxrate = bitrate,
  as before.
  

  • [DH] encoder/encoder.c