[PATCH] New SLP reduction testcase

[PATCH] New SLP reduction testcase

[Richard Biener]

To cover the case where we need two vectors.

Tested on x86_64-unknown-linux-gnu, applied.

Richard.

2015-05-27  Richard Biener  <rguenther@suse.de>

	* gcc.dg/vect/slp-reduc-7.c: New testcase.

Index: gcc/testsuite/gcc.dg/vect/slp-reduc-7.c
===================================================================
--- gcc/testsuite/gcc.dg/vect/slp-reduc-7.c	(revision 0)
+++ gcc/testsuite/gcc.dg/vect/slp-reduc-7.c	(working copy)
@@ -0,0 +1,60 @@
+/* { dg-require-effective-target vect_int } */
+
+#include <stdarg.h>
+#include "tree-vect.h"
+
+#define N 32
+
+unsigned int ub[N] = {0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,
+    0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45};
+unsigned int uc[N] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
+    0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
+
+/* Vectorization of reduction using loop-aware SLP (with two copies).  */
+
+__attribute__ ((noinline))
+int main1 (int n, int res0, int res1, int res2, int res3,
+	   int res4, int res5, int res6, int res7)
+{
+  int i;
+  unsigned int udiff0 = 5, udiff1 = 10, udiff2 = 20, udiff3 = 30;
+  unsigned int udiff4 = 45, udiff5 = 50, udiff6 = 60, udiff7 = 70;
+
+  for (i = 0; i < n; i++) {
+    udiff7 += (ub[8*i + 7] - uc[8*i + 7]);
+    udiff6 += (ub[8*i + 6] - uc[8*i + 6]);
+    udiff5 += (ub[8*i + 5] - uc[8*i + 5]);
+    udiff4 += (ub[8*i + 4] - uc[8*i + 4]);
+    udiff3 += (ub[8*i + 3] - uc[8*i + 3]);
+    udiff2 += (ub[8*i + 2] - uc[8*i + 2]);
+    udiff1 += (ub[8*i + 1] - uc[8*i + 1]);
+    udiff0 += (ub[8*i] - uc[8*i]);
+  }
+
+  /* Check results:  */
+  if (udiff0 != res0
+      || udiff1 != res1
+      || udiff2 != res2
+      || udiff3 != res3
+      || udiff4 != res4
+      || udiff5 != res5
+      || udiff6 != res6
+      || udiff7 != res7)
+    abort ();
+
+  return 0;
+}
+
+int main (void)
+{
+  check_vect ();
+
+  main1 (N/8, 37, 50, 68, 86, 109, 122, 140, 158);
+  main1 (N/8 - 1, 21, 32, 48, 64, 85, 96, 112, 128);
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { xfail vect_no_int_add } } } */
+/* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 1 "vect" { xfail vect_no_int_add } } } */
+/* { dg-final { cleanup-tree-dump "vect" } } */
+