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Reduce HammingDistance block size to 32k to avoid overflow

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Bug: libyuv:701
Test: HammingDistance unittest with large size
Change-Id: Id41a2c27eb8922d03b3a21dab32fa2e7b015ba38
Reviewed-on: https://chromium-review.googlesource.com/708335
Reviewed-by: Cheng Wang <wangcheng@google.com>
Commit-Queue: Frank Barchard <fbarchard@google.com>
This commit is contained in:
Frank Barchard 2017-10-09 19:56:42 -07:00 committed by Commit Bot
parent 60f433fbd9
commit e23b27d040
1 changed files with 4 additions and 1 deletions
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source/compare.cc
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@ -110,11 +110,14 @@ uint32 ARGBDetect(const uint8* argb, int stride_argb, int width, int height) {
return fourcc;
}
// NEON version accumulates in 16 bit shorts which overflow at 65536 bytes.
// So actual maximum is 1 less loop, which is 64436 - 32 bytes.
LIBYUV_API
uint64 ComputeHammingDistance(const uint8* src_a,
const uint8* src_b,
int count) {
const int kBlockSize = 65536;
const int kBlockSize = 1 << 15; // 32768;
const int kSimdSize = 64;
// SIMD for multiple of 64, and C for remainder
int remainder = count & (kBlockSize - 1) & ~(kSimdSize - 1);