MAINT: Mark npy_memchr with no_sanitize("alignment") on clang#21475
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charris merged 1 commit intonumpy:maintenance/1.22.xfrom May 9, 2022
Merged
MAINT: Mark npy_memchr with no_sanitize("alignment") on clang#21475charris merged 1 commit intonumpy:maintenance/1.22.xfrom
npy_memchr with no_sanitize("alignment") on clang#21475charris merged 1 commit intonumpy:maintenance/1.22.xfrom
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Clangs sanitizer reports unaligned access here, which is correct but intentional. It may well be that the code would be better of trying to avoid this unaligned access (and rather vectorizing harder). But, this is a bit of a tricky choice, since we have to optimize for different use-cases (in particular very short scans may be interesting). So changing this would best be done together with some more careful benchmarks. See also numpygh-21117, which introduced manual loop unrolling to avoid the unaligned access. Closes numpygh-21116
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Backport of #21467.
Clangs sanitizer reports unaligned access here, which is correct
but intentional. It may well be that the code would be better of
trying to avoid this unaligned access (and rather vectorizing harder).
But, this is a bit of a tricky choice, since we have to optimize for
different use-cases (in particular very short scans may be interesting).
So changing this would best be done together with some more careful
benchmarks.
See also gh-21117, which introduced manual loop unrolling to avoid the
unaligned access.
Closes gh-21116