BUG: Correct ambiguous logic for s390x CPU feature detection#29701
Merged
charris merged 1 commit intonumpy:maintenance/2.3.xfrom Sep 6, 2025
Merged
BUG: Correct ambiguous logic for s390x CPU feature detection#29701charris merged 1 commit intonumpy:maintenance/2.3.xfrom
charris merged 1 commit intonumpy:maintenance/2.3.xfrom
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Backport #29697.
This PR continues the work from #29678 to improve CPU feature detection in the Meson build system, specifically for the
s390xarchitecture.Problem:
The current detection for
VXEandVXE2is ambiguous:These ambiguities may cause NumPy to compile with unsupported CPU instructions, risking Illegal Instruction crashes or performance issues.
Solution:
This PR replaces the fragile patterns with precise regular expressions using word boundaries (
\b):VXE → '\\bvxe\\b'VXE2 → '\\bvxe2\\b'No changes are made to the feature hierarchy, compiler flags, or test code.