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bug#52001: numpy CPU dispatch probably prevents builds of python-numpy f
From: |
Ludovic Courtès |
Subject: |
bug#52001: numpy CPU dispatch probably prevents builds of python-numpy from being reproducible |
Date: |
Fri, 10 Dec 2021 23:42:41 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) |
Hi,
Ricardo Wurmus <rekado@elephly.net> skribis:
> Numpy accelerates operations with native code. Early in the build it
> probes the CPU / compiler for supported instruction extensions and
> then proceeds to build extensions for different features. I’m
> guessing that this won’t work when building on older CPUs, so the
> results of two builds on different CPUs may differ.
I don’t see anything in the build log that suggests it might be building
for a specific ISA extension (on x86_64).
On the contrary, it seems to do the right thing by dispatching to the
right optimized implementation at run time, in numpy/core/src/umath.
Apparently this directory contains templates for home-made function
multi-versioning, with variants and dispatch code generated by
numpy/core/code_generators/generate_umath.py.
Besides, I see the same .pyc difference as Maxime, but I don’t think it
relates to ISA extensions.
Ludo’.
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