re PR tree-optimization/79690 (IVOPTs drops gs: prefix)

2017-02-27  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/79690
	* tree-vect-stmts.c (vectorizable_store): Use vector type
	built from the DR with address-space.

	* gcc.target/i386/pr79690.c: New testcase.

From-SVN: r245751

gcc/ChangeLog

+2017-02-27  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/79690
+	* tree-vect-stmts.c (vectorizable_store): Use vector type
+	built from the DR with address-space.
+
 2017-02-26  Gerald Pfeifer  <gerald@pfeifer.com>
 
 	* doc/invoke.texi (Optimize Options): Refine the description

gcc/testsuite/ChangeLog

+2017-02-27  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/79690
+	* gcc.target/i386/pr79690.c: New testcase.
+
 2017-02-26  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/51119

gcc/testsuite/gcc.target/i386/pr79690.c

+/* { dg-do compile } */
+/* { dg-options "-O3 -msse2 -mno-avx" } */
+
+void fill(unsigned char __seg_gs *arr, unsigned char c, long n)
+{
+  for (long i = 0; i < n; ++i)
+    arr[i] = c;
+}
+
+/* { dg-final { scan-assembler "mov\[au\]p.\[ \t\]\[^,\]+, %gs:" } } */

gcc/tree-vect-stmts.c

@@ -6324,7 +6324,7 @@ vectorizable_store (gimple *stmt, gimple_stmt_iterator *gsi, gimple **vec_stmt,
 		   vect_permute_store_chain().  */
 		vec_oprnd = result_chain[i];
 
-	      data_ref = fold_build2 (MEM_REF, TREE_TYPE (vec_oprnd),
+	      data_ref = fold_build2 (MEM_REF, vectype,
 				      dataref_ptr,
 				      dataref_offset
 				      ? dataref_offset