diff mbox series

Fix PR92558

Message ID nycvar.YFH.7.76.1911181339100.5566@zhemvz.fhfr.qr
State New
Headers show
Series Fix PR92558 | expand

Commit Message

Richard Biener Nov. 18, 2019, 12:39 p.m. UTC 
Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.

Richard.

2019-11-18  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/92558
	* tree-vect-loop.c (vect_create_epilog_for_reduction): When
	reducting the width of a reduction vector def update new_phis.

	* gcc.dg/vect/pr92558.c: New testcase.
diff mbox series

Patch

Index: gcc/tree-vect-loop.c
===================================================================
--- gcc/tree-vect-loop.c	(revision 278389)
+++ gcc/tree-vect-loop.c	(working copy)
@@ -5198,6 +5198,7 @@  vect_create_epilog_for_reduction (stmt_v
 	  new_temp = make_ssa_name (vectype1);
 	  epilog_stmt = gimple_build_assign (new_temp, code, dst1, dst2);
 	  gsi_insert_before (&exit_gsi, epilog_stmt, GSI_SAME_STMT);
+	  new_phis[0] = epilog_stmt;
 	}
 
       if (reduce_with_shift && !slp_reduc)
Index: gcc/testsuite/gcc.dg/vect/pr92558.c
===================================================================
--- gcc/testsuite/gcc.dg/vect/pr92558.c	(nonexistent)
+++ gcc/testsuite/gcc.dg/vect/pr92558.c	(working copy)
@@ -0,0 +1,23 @@ 
+/* { dg-additional-options "-mavx2" { target avx2_runtime } } */
+
+void __attribute__((noipa))
+foo (int * __restrict wsum, int * __restrict cff, int * __restrict weight)
+{
+  for (int i = 0; i < 16; ++i)
+    {
+      *wsum += weight[2*i+0];
+      *cff += weight[2*i+1];
+    }
+}
+
+int main()
+{
+  int weight[32];
+  for (int i = 0; i < 32; ++i)
+    weight[i] = i;
+  int wsum = 0, cff = 0;
+  foo (&wsum, &cff, weight);
+  if (wsum != 240 || cff != 256)
+    __builtin_abort ();
+  return 0;
+}