re PR tree-optimization/88182 (ICE in vectorizable_reduction, at tree-vect-loop.c:6465)

2018-11-26  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/88182
	* tree-vect-loop.c (vectorizable_reduction): Pick up single
	correct reduc_def_info.
	* tree-vect-slp.c (vect_analyze_slp_instance): Set
	STMT_VINFO_REDUC_DEF of the first stmt.

	libgomp/
	* testsuite/libgomp.c++/pr88182.C: New testcase.

From-SVN: r266467

2 files changed, 47 insertions, 0 deletions

diff --git a/libgomp/ChangeLog b/libgomp/ChangeLog
index 4037356ca6d..706835541e4 100644
--- a/libgomp/ChangeLog
+++ b/libgomp/ChangeLog
@@ -1,3 +1,8 @@
+2018-11-26  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/88182
+	* testsuite/libgomp.c++/pr88182.C: New testcase.
+
 2018-11-20  Jakub Jelinek  <jakub@redhat.com>
 
 	PR bootstrap/88106
diff --git a/libgomp/testsuite/libgomp.c++/pr88182.C b/libgomp/testsuite/libgomp.c++/pr88182.C
new file mode 100644
index 00000000000..2e3ac69c5fc
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c++/pr88182.C
@@ -0,0 +1,42 @@
+// { dg-do run }
+// { dg-options "-O -fopenmp -ftree-loop-if-convert -fno-ssa-phiopt" }
+
+#pragma omp declare simd simdlen(4) notinbranch
+__attribute__((noinline)) int
+foo (double c1, double c2)
+{
+  double z1 = c1, z2 = c2;
+  int res = 100, i;
+
+  for (i = 0; i < 5; i++)
+    {
+      res = (z1 * z1 + z2 * z2 > 4.0) ? (i < res ? i : res) : res;
+      z1 = c1 + z1 * z1 - z2 * z2;
+      z2 = c2 + 2.0 * z1 * z2;
+      c1 += 0.5;
+      c2 += 0.5;
+    }
+  return res;
+}
+
+__attribute__((noinline, noclone)) void
+bar (double *x, double *y)
+{
+  asm volatile ("" : : "rm" (x), "rm" (y) : "memory");
+}
+
+int
+main ()
+{
+  int i;
+  double c[4] = { 0.0, 1.0, 0.0, 1.0 };
+  double d[4] = { 0.0, 1.0, 2.0, 0.0 };
+  int e[4];
+  bar (c, d);
+#pragma omp simd safelen(4)
+  for (i = 0; i < 4; i++)
+    e[i] = foo (c[i], d[i]);
+  if (e[0] != 3 || e[1] != 1 || e[2] != 1 || e[3] != 2)
+    __builtin_abort ();
+  return 0;
+}