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Benchmarks: align malloc'ed buffers. #3794

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Merged
martin-frbg merged 2 commits into from
Oct 21, 2022
Merged

Benchmarks: align malloc'ed buffers. #3794

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Benchmarks: align malloc'ed buffers.
bartoldeman Oct 20, 2022
9e6b060
Fix comment.
bartoldeman Oct 21, 2022
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18 changes: 18 additions & 0 deletions benchmark/bench.h
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,24 @@ static void *huge_malloc(BLASLONG size){

#endif

/* Benchmarks should allocate with cacheline (often 64 bytes) alignment
to avoid unreliable results. This technique, storing the allocated
pointer value just before the aligned memory, doesn't require
C11's aligned_alloc for compatibility with older compilers. */
static void *aligned_alloc_cacheline(size_t n)
{
void *p = malloc((size_t)(void *) + n + L1_DATA_LINESIZE - 1);
if (p) {
void **newp = (void **)
(((uintptr_t)p + L1_DATA_LINESIZE) & (uintptr_t)-L1_DATA_LINESIZE);
newp[-1] = p;
p = newp;
}
return p;
}
#define malloc aligned_alloc_cacheline
#define free(p) free((p) ? ((void **)(p))[-1] : (p))

#if defined(__WIN32__) || defined(__WIN64__) || !defined(_POSIX_TIMERS)
struct timeval start, stop;
#elif defined(__APPLE__)
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