)]}'
{
  "commit": "c17b62e1bd8fe9335ba247061c072b10392e88a7",
  "tree": "ce9b28fcd55dd269215e4d9901e1dd179ece3c66",
  "parents": [
    "ec1871554b4793ad274ed8ae764ff5044d75e0d4"
  ],
  "author": {
    "name": "Timothy B. Terriberry",
    "email": "tterribe@xiph.org",
    "time": "Wed May 05 17:58:19 2010 -0400"
  },
  "committer": {
    "name": "Timothy B. Terriberry",
    "email": "tterribe@xiph.org",
    "time": "Tue Jun 15 19:55:14 2010 -0700"
  },
  "message": "Change bitreader to use a larger window.\n\nChange bitreading functions to use a larger window which is refilled less\n often.\n\nThis makes it cheap enough to do bounds checking each time the window is\n refilled, which avoids the need to copy the input into a large circular\n buffer.\nThis uses less memory and speeds up the total decode time by 1.6% on an ARM11,\n 2.8% on a Cortex A8, and 2.2% on x86-32, but less than 1% on x86-64.\n\nInlining vp8dx_bool_decoder_fill() has a big penalty on x86-32, as does moving\n the refill loop to the front of vp8dx_decode_bool().\nHowever, having the refill loop between computation of the split values and\n the branch in vp8_decode_mb_tokens() is a big win on ARM (presumably due to\n memory latency and code size: refilling after normalization duplicates the\n code in the DECODE_AND_BRANCH_IF_ZERO and DECODE_AND_LOOP_IF_ZERO cases.\nUnfortunately, refilling at the end of vp8dx_bool_decoder_fill() and at the\n beginning of each decode step in vp8_decode_mb_tokens() means the latter\n requires an extra refill at the end.\nPlatform-specific versions could avoid the problem, but would require most of\n detokenize.c to be duplicated.\n\nChange-Id: I16c782a63376f2a15b78f8086d899b987204c1c7\n",
  "tree_diff": [
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