Optimize expand_omp_for_static_chunk for chunk_size one

2015-08-24  Tom de Vries  <tom@codesourcery.com>

	PR tree-optimization/65468
	* omp-low.c (expand_omp_for_static_chunk): Remove inner loop if
	chunk_size is one.

	* gcc.dg/gomp/static-chunk-size-one.c: New test.

	* testsuite/libgomp.c/static-chunk-size-one.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@227124 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 23 insertions, 0 deletions

diff --git a/libgomp/testsuite/libgomp.c/static-chunk-size-one.c b/libgomp/testsuite/libgomp.c/static-chunk-size-one.c
new file mode 100644
index 00000000000..9ed7b83625a
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c/static-chunk-size-one.c
@@ -0,0 +1,23 @@
+extern void abort ();
+
+int
+bar ()
+{
+  int a = 0, i;
+
+#pragma omp parallel for num_threads (3) reduction (+:a) schedule(static, 1)
+  for (i = 0; i < 10; i++)
+    a += i;
+
+  return a;
+}
+
+int
+main (void)
+{
+  int res;
+  res = bar ();
+  if (res != 45)
+    abort ();
+  return 0;
+}