re PR tree-optimization/79683 (SLP vectorizer drops gs: prefix)

2017-02-23  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/79683
	* tree-vect-stmts.c (vect_analyze_stmt): Do not overwrite
	vector types for data-refs.

	* gcc.target/i386/pr79683.c: New testcase.

From-SVN: r245679

gcc/ChangeLog

+2017-02-23  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/79683
+	* tree-vect-stmts.c (vect_analyze_stmt): Do not overwrite
+	vector types for data-refs.
+
 2017-02-23  Martin Liska  <mliska@suse.cz>
 
 	* params.def (PARAM_MIN_NONDEBUG_INSN_UID): Change default to 0.

gcc/testsuite/ChangeLog

+2017-02-23  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/79683
+	* gcc.target/i386/pr79683.c: New testcase.
+
 2017-02-22  Jeff Law  <law@redhat.com>
 
 	PR tree-optimization/79578

gcc/testsuite/gcc.target/i386/pr79683.c

+/* { dg-do compile } */
+/* { dg-options "-O3 -msse2" } */
+
+struct s {
+    __INT64_TYPE__ a;
+    __INT64_TYPE__ b;
+};
+void test(struct s __seg_gs *x) {
+    x->a += 1;
+    x->b -= 1;
+}
+
+/* We get the function vectorized, verify the load and store are
+   address-space qualified.  */
+/* { dg-final { scan-assembler-times "padd" 1 } } */
+/* { dg-final { scan-assembler-times "%gs" 2 } } */

gcc/tree-vect-stmts.c

@@ -8486,6 +8486,10 @@ vect_analyze_stmt (gimple *stmt, bool *need_to_vectorize, slp_tree node)
     {
       gcc_assert (PURE_SLP_STMT (stmt_info));
 
+      /* Memory accesses already got their vector type assigned
+         in vect_analyze_data_refs.  */
+      if (! STMT_VINFO_DATA_REF (stmt_info))
+	{
 	  scalar_type = TREE_TYPE (gimple_get_lhs (stmt));
 	  if (dump_enabled_p ())
 	    {
@@ -8518,6 +8522,7 @@ vect_analyze_stmt (gimple *stmt, bool *need_to_vectorize, slp_tree node)
 
 	  STMT_VINFO_VECTYPE (stmt_info) = vectype;
 	}
+   }
 
   if (STMT_VINFO_RELEVANT_P (stmt_info))
     {