[gcc r12-11229] tree-optimization/119534 - reject bogus emulated vectorized gather

[Richard Biener]

https://gcc.gnu.org/g:550edc99476376ee0350be90b9e61b337ffb0ff3

commit r12-11229-g550edc99476376ee0350be90b9e61b337ffb0ff3
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Apr 1 14:13:03 2025 +0200

    tree-optimization/119534 - reject bogus emulated vectorized gather
    
    The following makes sure to reject the attempts to emulate a vector
    gather when the discovered index vector type is a vector mask.
    
            PR tree-optimization/119534
            * tree-vect-stmts.cc (get_load_store_type): Reject
            VECTOR_BOOLEAN_TYPE_P offset vector type for emulated gathers.
    
            * gcc.dg/vect/pr119534.c: New testcase.
    
    (cherry picked from commit d0cc14c62ad7403afcab3c2e38851d3ab179352f)

Diff:
---
 gcc/testsuite/gcc.dg/vect/pr119534.c | 11 +++++++++++
 gcc/tree-vect-stmts.cc               |  1 +
 2 files changed, 12 insertions(+)

diff --git a/gcc/testsuite/gcc.dg/vect/pr119534.c b/gcc/testsuite/gcc.dg/vect/pr119534.c
new file mode 100644
index 000000000000..0b4130b7cfaa
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/pr119534.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-mavx512bw" { target { x86_64-*-* i?86-*-* } } } */
+
+void f(int w, int *out, double *d)
+{
+  for (int j = 0; j < w; j++)
+    {
+      const int i = (j >= w / 2);
+      out[j] += d[i];
+    }
+}
diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
index b1ab4bce7d28..bc9f95cab970 100644
--- a/gcc/tree-vect-stmts.cc
+++ b/gcc/tree-vect-stmts.cc
@@ -2493,6 +2493,7 @@ get_load_store_type (vec_info  *vinfo, stmt_vec_info stmt_info,
 	  else if (!TYPE_VECTOR_SUBPARTS (vectype).is_constant ()
 		   || !TYPE_VECTOR_SUBPARTS
 			 (gs_info->offset_vectype).is_constant ()
+		   || VECTOR_BOOLEAN_TYPE_P (gs_info->offset_vectype)
 		   || !constant_multiple_p (TYPE_VECTOR_SUBPARTS
 					      (gs_info->offset_vectype),
 					    TYPE_VECTOR_SUBPARTS (vectype)))