[gcc(refs/vendors/vrull/heads/slp-improvements)] Fix element_prevision check for vec_perm+view_convert pattern

[Philipp Tomsich]

https://gcc.gnu.org/g:f0072d8a1dee8a6278ad68abe257f8f2433bfd91

commit f0072d8a1dee8a6278ad68abe257f8f2433bfd91
Author: Manolis Tsamis <manolis.tsamis@vrull.eu>
Date:   Fri Nov 24 10:08:24 2023 +0100

    Fix element_prevision check for vec_perm+view_convert pattern
    
    Addresses the blender_r ICE reported as part of #343.
    
    Ref #343

Diff:
---
 gcc/match.pd | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/gcc/match.pd b/gcc/match.pd
index be623d9773c..e63be8e2158 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -9965,20 +9965,21 @@ and,
      d = VEC_PERM_EXPR <a, b, NEW_VCST>;  */
 
 (simplify
- (vec_perm (view_convert?@0 (vec_perm @1 @2 VECTOR_CST@3)) @0 VECTOR_CST@4)
+ (vec_perm (view_convert?@0 (vec_perm@1 @2 @3 VECTOR_CST@4)) @0 VECTOR_CST@5)
  (if (TYPE_VECTOR_SUBPARTS (type).is_constant ())
   (with
    {
      machine_mode result_mode = TYPE_MODE (type);
-     machine_mode op_mode = TYPE_MODE (TREE_TYPE (@1));
+     machine_mode op_mode = TYPE_MODE (TREE_TYPE (@2));
      int nelts = TYPE_VECTOR_SUBPARTS (type).to_constant ();
      vec_perm_builder builder0;
      vec_perm_builder builder1;
      vec_perm_builder builder2 (nelts, nelts, 1);
    }
-   (if (tree_to_vec_perm_builder (&builder0, @3)
-	&& tree_to_vec_perm_builder (&builder1, @4)
-	&& element_precision (type) == element_precision (TREE_TYPE (@0)))
+   (if (tree_to_vec_perm_builder (&builder0, @4)
+	&& tree_to_vec_perm_builder (&builder1, @5)
+	&& element_precision (TREE_TYPE (@0))
+	   == element_precision (TREE_TYPE (@1)))
     (with
      {
        vec_perm_indices sel0 (builder0, 2, nelts);
@@ -10000,10 +10001,10 @@ and,
 	       ? (!can_vec_perm_const_p (result_mode, op_mode, sel0, false)
 		  || !can_vec_perm_const_p (result_mode, op_mode, sel1, false))
 	       : !can_vec_perm_const_p (result_mode, op_mode, sel1, false)))
-	 op0 = vec_perm_indices_to_tree (TREE_TYPE (@4), sel2);
+	 op0 = vec_perm_indices_to_tree (TREE_TYPE (@5), sel2);
      }
      (if (op0)
-      (view_convert (vec_perm @1 @2 { op0; }))))))))
+      (view_convert (vec_perm @2 @3 { op0; }))))))))
 
 /* Merge
      c = VEC_PERM_EXPR <a, b, VCST0>;