[gcc r14-1708] vect: Don't pass subtype to vect_widened_op_tree where not needed [PR 110142]

[gcc r14-1708] vect: Don't pass subtype to vect_widened_op_tree where not needed [PR 110142]

[Andre Simoes Dias Vieira]

https://gcc.gnu.org/g:3ad0ef34ccbe656a7a9e5962fe1173226104174a

commit r14-1708-g3ad0ef34ccbe656a7a9e5962fe1173226104174a
Author: Andre Vieira <andre.simoesdiasvieira@arm.com>
Date:   Mon Jun 12 10:30:39 2023 +0100

    vect: Don't pass subtype to vect_widened_op_tree where not needed [PR 110142]
    
    This patch fixes an issue introduced by
    g:2f482a07365d9f4a94a56edd13b7f01b8f78b5a0, where a subtype was beeing passed
    to vect_widened_op_tree, when no subtype was to be used. This lead to an
    errorneous use of IFN_VEC_WIDEN_MINUS.
    
    gcc/ChangeLog:
    
            PR middle-end/110142
            * tree-vect-patterns.cc (vect_recog_widen_op_pattern): Don't pass
            subtype to vect_widened_op_tree and remove subtype parameter, also
            remove superfluous overloaded function definition.
            (vect_recog_widen_plus_pattern): Remove subtype parameter and dont pass
            to call to vect_recog_widen_op_pattern.
            (vect_recog_widen_minus_pattern): Likewise.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.dg/vect/pr110142.c: New test.

Diff:
---
 gcc/testsuite/gcc.dg/vect/pr110142.c |  9 +++++++++
 gcc/tree-vect-patterns.cc            | 27 ++++-----------------------
 2 files changed, 13 insertions(+), 23 deletions(-)

diff --git a/gcc/testsuite/gcc.dg/vect/pr110142.c b/gcc/testsuite/gcc.dg/vect/pr110142.c
new file mode 100644
index 00000000000..a88dbe400f4
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/pr110142.c
@@ -0,0 +1,9 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-O3" } */
+void test(short *x, unsigned short *y, int n)
+{
+  for (int i = 0; i < n; i++)
+      x[i] = (y[i] - x[i]) >> 1;
+}
+
+/* { dg-final { scan-tree-dump-not "widen_minus" "vect" } } */
diff --git a/gcc/tree-vect-patterns.cc b/gcc/tree-vect-patterns.cc
index dc102c91935..ab21f701d16 100644
--- a/gcc/tree-vect-patterns.cc
+++ b/gcc/tree-vect-patterns.cc
@@ -1405,15 +1405,14 @@ static gimple *
 vect_recog_widen_op_pattern (vec_info *vinfo,
 			     stmt_vec_info last_stmt_info, tree *type_out,
 			     tree_code orig_code, code_helper wide_code,
-			     bool shift_p, const char *name,
-			     optab_subtype *subtype = NULL)
+			     bool shift_p, const char *name)
 {
   gimple *last_stmt = last_stmt_info->stmt;
 
   vect_unpromoted_value unprom[2];
   tree half_type;
   if (!vect_widened_op_tree (vinfo, last_stmt_info, orig_code, orig_code,
-			     shift_p, 2, unprom, &half_type, subtype))
+			     shift_p, 2, unprom, &half_type))
 
     return NULL;
 
@@ -1480,20 +1479,6 @@ vect_recog_widen_op_pattern (vec_info *vinfo,
 			      type, pattern_stmt, vecctype);
 }
 
-static gimple *
-vect_recog_widen_op_pattern (vec_info *vinfo,
-			     stmt_vec_info last_stmt_info, tree *type_out,
-			     tree_code orig_code, internal_fn wide_ifn,
-			     bool shift_p, const char *name,
-			     optab_subtype *subtype = NULL)
-{
-  combined_fn ifn = as_combined_fn (wide_ifn);
-  return vect_recog_widen_op_pattern (vinfo, last_stmt_info, type_out,
-				      orig_code, ifn, shift_p, name,
-				      subtype);
-}
-
-
 /* Try to detect multiplication on widened inputs, converting MULT_EXPR
    to WIDEN_MULT_EXPR.  See vect_recog_widen_op_pattern for details.  */
 
@@ -1513,11 +1498,9 @@ static gimple *
 vect_recog_widen_plus_pattern (vec_info *vinfo, stmt_vec_info last_stmt_info,
 			       tree *type_out)
 {
-  optab_subtype subtype;
   return vect_recog_widen_op_pattern (vinfo, last_stmt_info, type_out,
 				      PLUS_EXPR, IFN_VEC_WIDEN_PLUS,
-				      false, "vect_recog_widen_plus_pattern",
-				      &subtype);
+				      false, "vect_recog_widen_plus_pattern");
 }
 
 /* Try to detect subtraction on widened inputs, converting MINUS_EXPR
@@ -1526,11 +1509,9 @@ static gimple *
 vect_recog_widen_minus_pattern (vec_info *vinfo, stmt_vec_info last_stmt_info,
 			       tree *type_out)
 {
-  optab_subtype subtype;
   return vect_recog_widen_op_pattern (vinfo, last_stmt_info, type_out,
 				      MINUS_EXPR, IFN_VEC_WIDEN_MINUS,
-				      false, "vect_recog_widen_minus_pattern",
-				      &subtype);
+				      false, "vect_recog_widen_minus_pattern");
 }
 
 /* Function vect_recog_ctz_ffs_pattern