[issue30150] raw debug allocators to not return malloc alignment

[STINNER Victor]

STINNER Victor added the comment:

> On for example x32 malloc returns 16 byte aligned memory but size_t is 4 bytes.

x32 is a strange platform :-( Does numpy support it? I'm not sure that Python works on such platform.

I suggest to hardcode 16 or 32 bytes in _PyMem_DebugRawAlloc instead of relying on sizeof(size_t). pymalloc aligns memory allocations to 8 bytes if I recall correctly.


> How it cause problem?

numpy uses SIMD instructions which require strict memory alignement.

Note: There was also an issue #18835 to "Add aligned memory variants to the suite of PyMem functions/macros", but it was rejected.

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nosy: +haypo

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