[gcc r15-322] Fix SLP reduction initial value for pointer reductions

[Richard Biener via Gcc-cvs]

https://gcc.gnu.org/g:b65cc09f9c78633a4f29d458a0549f36627c1259

commit r15-322-gb65cc09f9c78633a4f29d458a0549f36627c1259
Author: Richard Biener <rguent...@suse.de>
Date:   Fri Feb 23 11:21:20 2024 +0100

    Fix SLP reduction initial value for pointer reductions
    
    For pointer reductions we need to convert the initial value to
    the vector component integer type.
    
            * tree-vect-loop.cc (get_initial_defs_for_reduction): Convert
            initial value to the vector component type.

Diff:
---
 gcc/tree-vect-loop.cc | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index 29c03c246d45..704df7bdcc73 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -5618,7 +5618,14 @@ get_initial_defs_for_reduction (loop_vec_info loop_vinfo,
       if (i >= initial_values.length () || (j > i && neutral_op))
        op = neutral_op;
       else
-       op = initial_values[i];
+       {
+         if (!useless_type_conversion_p (TREE_TYPE (vector_type),
+                                         TREE_TYPE (initial_values[i])))
+           initial_values[i] = gimple_convert (&ctor_seq,
+                                               TREE_TYPE (vector_type),
+                                               initial_values[i]);
+         op = initial_values[i];
+       }
 
       /* Create 'vect_ = {op0,op1,...,opn}'.  */
       number_of_places_left_in_vector--;