https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104644
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 52494
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52494&action=edit
gcc12-pr104644.patch
Untested fix.
The match.pd optimization relies on (bswap @1) actually being simplified into
something other than bswap when @1 is INTEGER_CST, but that isn't guaranteed at
least in GENERIC - due to TREE_OVERFLOW in there.
The patch uses ! to enforce simplification of that and because ! isn't
supported in GENERIC, also requires GIMPLE for the optimization.
