From: Richard Biener <rguenther@suse.de>
Date: Tue, 1 Apr 2025 12:13:03 +0000 (+0200)
Subject: tree-optimization/119534 - reject bogus emulated vectorized gather
X-Git-Tag: basepoints/gcc-16~424
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d0cc14c62ad7403afcab3c2e38851d3ab179352f;p=thirdparty%2Fgcc.git

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.
---

diff --git a/gcc/testsuite/gcc.dg/vect/pr119534.c b/gcc/testsuite/gcc.dg/vect/pr119534.c
new file mode 100644
index 00000000000..0b4130b7cfa
--- /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 813b2b77951..8bd5ea96667 100644
--- a/gcc/tree-vect-stmts.cc
+++ b/gcc/tree-vect-stmts.cc
@@ -2522,6 +2522,7 @@ get_load_store_type (vec_info  *vinfo, stmt_vec_info stmt_info,
 	{
 	  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)))