[PATCH] tree-optimization/107672 - avoid vector mode type_for_mode call

[Richard Biener via Gcc-patches]

The following avoids using type_for_mode on vector modes which might
not work for all frontends.  Instead we look for the inner mode
type and use build_vector_type_for_mode instead.

Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.

        PR tree-optimization/107672
        * tree-vect-stmts.cc (supportable_widening_operation): Avoid
        type_for_mode on vector modes.
---
 gcc/tree-vect-stmts.cc | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
index bc0ef136f19..b35b986889d 100644
--- a/gcc/tree-vect-stmts.cc
+++ b/gcc/tree-vect-stmts.cc
@@ -12195,9 +12195,15 @@ supportable_widening_operation (vec_info *vinfo,
        intermediate_type
          = vect_halve_mask_nunits (prev_type, intermediate_mode);
       else
-       intermediate_type
-         = lang_hooks.types.type_for_mode (intermediate_mode,
-                                           TYPE_UNSIGNED (prev_type));
+       {
+         gcc_assert (VECTOR_MODE_P (intermediate_mode));
+         tree intermediate_element_type
+           = lang_hooks.types.type_for_mode (GET_MODE_INNER 
(intermediate_mode),
+                                             TYPE_UNSIGNED (prev_type));
+         intermediate_type
+           = build_vector_type_for_mode (intermediate_element_type,
+                                         intermediate_mode);
+       }
 
       if (VECTOR_BOOLEAN_TYPE_P (intermediate_type)
          && VECTOR_BOOLEAN_TYPE_P (prev_type)
-- 
2.35.3