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Add comment explaining MSan false-positive workaround

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atdt 2018-12-15 01:23:22 -08:00 committed by Victor Costan
parent 5913c5f8e4
commit f7aece15e2
1 changed files with 2 additions and 0 deletions
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snappy.cc
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@ -695,6 +695,8 @@ static inline void Report(const char *algorithm, size_t compressed_size,
static inline uint32 ExtractLowBytes(uint32 v, int n) {
DCHECK_GE(n, 0);
DCHECK_LE(n, 4);
// TODO(b/121042345): Remove !defined(MEMORY_SANITIZER) once MSan
// handles _bzhi_u32() correctly.
#if defined(__BMI2__) && !defined(MEMORY_SANITIZER)
return _bzhi_u32(v, 8 * n);
#else