https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115533
Sam James <sjames at gcc dot gnu.org> changed:
What |Removed |Added
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Attachment #58484|0 |1
is obsolete| |
--- Comment #17 from Sam James <sjames at gcc dot gnu.org> ---
Created attachment 58492
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58492&action=edit
test.c
This seems to be the best I can get out of it.
The original (upstream) code passes with -ffp-contract=off, so if this is
invalid, no feelings will be hurt.
I'm going to keep looking for other IPA miscompilations when I have spare
cycles.
This reduced testcase passes with gcc 11 with -O3 -march=znver2
-fno-vect-cost-model -fipa-pta -ffp-contract=fast, but fails with 12+ with the
same options. The relationship with the vectoriser here makes it hard to
understand (in addition to my inexperience with FP so far).
