https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123258
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2025-12-22
Ever confirmed|0 |1
Component|middle-end |tree-optimization
CC| |rguenth at gcc dot gnu.org
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
The "impressive" thing is that the extra negation on half of the components
causes us to use interleaving, aka SLP discovery fails here. And the
reason is re-association makes this
a(i+1)=-(a(i+1)*b(2))
