The following patch makes fold_ternary no longer make
VEC_PERMs valid for the target invalid. As pointed out
in the PR we only need to make sure this doesn't happen
after vector lowering.
I won't have time to improve on the following patch this
week - Marc, can you take over here?
Bootstrapped & tested on x86_64-unknown-linux-gnu.
Thanks,
Richard.
2014-10-30 Richard Biener <rguent...@suse.de>
PR middle-end/63666
* fold-const.c: Include optabs.h.
(fold_ternary_loc): Only change the VEC_PERM mask if it
then is a valid constant permutation on the target.
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));
