https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95798
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 #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 50249
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50249&action=edit
gcc11-pr95798.patch
Untested fix.
The #c4 qux case above is not fixed by it, but it isn't a regression, so I
think we should defer that one for GCC 12 (file a separate PR for that).
And, it would work (if done e.g. at expansion time) only when there is signed
integer overflow, so not for -fwrapv nor when e.g. the narrower type is
unsigned, so I think we need the single_use match.pd case because after those
changes, there is no way to undo that.
