https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102902
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> --- (In reply to Martin Liška from comment #3) > I guess fixed with: > > commit aa15952d646fd5dd569fce287b719a737ae66e4f (HEAD -> master, > origin/trunk, origin/master, origin/HEAD) > Author: Richard Biener <rguent...@suse.de> > Date: Mon Oct 25 09:33:15 2021 +0200 > > tree-optimization/102920 - fix PHI VN with undefined args > > This fixes a latent issue exposed by now allowing VN_TOP in PHI > arguments. We may only use optimistic equality when merging values on > different edges, not when merging values on the same edge - in particular > we may not choose the undef value on any edge when there's a not undef > value as well. > > 2021-10-25 Richard Biener <rguent...@suse.de> > > PR tree-optimization/102920 > * tree-ssa-sccvn.h (expressions_equal_p): Add argument > controlling VN_TOP matching behavior. > * tree-ssa-sccvn.c (expressions_equal_p): Likewise. > (vn_phi_eq): Do not optimistically match VN_TOP. > > * gcc.dg/torture/pr102920.c: New testcase. Sorry, wrong PR.
