10000 BUG: longdouble with elsize 12 is never uint alignable by mattip · Pull Request #12611 · numpy/numpy · GitHub
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BUG: longdouble with elsize 12 is never uint alignable #12611

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Merged
merged 5 commits into from
Dec 26, 2018
Merged

BUG: longdouble with elsize 12 is never uint alignable #12611

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d2ec5a1
DEV: activate assert code in 32bit linux via -UNDEBUG
mattip Dec 25, 2018
16c30d0
BUG: add case for longdouble alignment size
mattip Dec 25, 2018
cb690e5
BUG: non-uint-aligned arrays were counted as uint-aligned
ahaldane Dec 26, 2018
617dbcb
Merge pull request #1 from ahaldane/mattip_align-longdouble
mattip Dec 26, 2018
de4c4ef
MAINT: improve comments
mattip Dec 26, 2018
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MAINT: improve comments
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@mattip
mattip committed Dec 26, 2018
commit de4c4ef7e8a828331694de290582dced09c4df6f
2 changes: 1 addition & 1 deletion numpy/core/src/common/array_assign.c
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Expand Up @@ -129,7 +129,7 @@ raw_array_is_aligned(int ndim, npy_intp *shape,
return 1;
}
else {
/* always return false for alignment == 0, which means unaligned */
/* always return false for alignment == 0, which means cannot-be-aligned */
return 0;
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Why is alignment == 0 even a legal argument to this function?

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Maybe there is a better way to organize it... but the idea is that npy_uint_alignment, which normally returns the uint alignment, returns 0 if the type is not uint-alignable.

Then, it turned out to be convenient to allow the result of npy_uint_alignment to be passed directly to raw_array_is_aligned.

An alternative would be to check the return value of npy_uint_alignment explicitly everywhere it is used. But since it is pretty much always used as an arg to raw_array_is_aligned it seemed less complicated this way.

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changed the comment

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Thanks

}
}
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5 changes: 3 additions & 2 deletions numpy/core/src/common/array_assign.h
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Expand Up @@ -87,9 +87,10 @@ broadcast_strides(int ndim, npy_intp *shape,

/*
* Checks whether a data pointer + set of strides refers to a raw
* array whose elements are all aligned to a given alignment.
* array whose elements are all aligned to a given alignment. Returns
* 1 if data is aligned to alignment or 0 if not.
* alignment should be a power of two, or may be the sentinel value 0 to mean
* unaligned, in which case false is always returned.
* cannot-be-aligned, in which case 0 (false) is always returned.
*/
NPY_NO_EXPORT int
raw_array_is_aligned(int ndim, npy_intp *shape,
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