https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85698
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
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Keywords| |wrong-code
Priority|P3 |P2
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmpf. Sounds like the issue requires "careful" preparation of stmt operand
order
(aka SSA name numbering). We've had issues in this area in the past.
Can you help me with isolating this to a single function inside that file?
Maybe try sticking __attribute__((optimize("no-tree-vectorize"))) on some
functions. Oh, there's also the vect_loop debug counter
(-fdbg-cnt=vect_loop:N).
Eventually we simply trigger a latent issue elsewhere when we now recognize
sth for SLP vectorization.
Otherwise I'll have to find a power8 machine where I can set up CPU 2017
myself (unlikely this week due to public holidays).
