https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63666
--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Index: gcc/fold-const.c
===================================================================
--- gcc/fold-const.c (revision 216834)
+++ gcc/fold-const.c (working copy)
@@ -82,6 +82,7 @@ along with GCC; see the file COPYING3.
#include "ipa-ref.h"
#include "cgraph.h"
#include "generic-match.h"
+#include "optabs.h"
/* Nonzero if we are folding constants inside an initializer; zero
otherwise. */
@@ -14311,7 +14331,8 @@ fold_ternary_loc (location_t loc, enum t
if (op0 == op1 && !single_arg)
changed = true;
- if (need_mask_canon && arg2 == op2)
+ if (need_mask_canon && arg2 == op2
+ && can_vec_perm_p (TYPE_MODE (type), false, sel))
{
tree *tsel = XALLOCAVEC (tree, nelts);
tree eltype = TREE_TYPE (TREE_TYPE (arg2));
fixes the IA64 case.
