Fix condition folding in c_parser_omp_for_loop

2017-09-16  Tom de Vries  <tom@codesourcery.com>

	PR c/81875
	* c-parser.c (c_parser_omp_for_loop): Fold only operands of cond, not
	cond itself.

	* testsuite/libgomp.c-c++-common/pr81875.c: New test.

From-SVN: r252873

2 files changed, 51 insertions, 0 deletions

diff --git a/libgomp/ChangeLog b/libgomp/ChangeLog
index 9fafd622b60..0c8832cf097 100644
--- a/libgomp/ChangeLog
+++ b/libgomp/ChangeLog
@@ -1,3 +1,8 @@
+2017-09-16  Tom de Vries  <tom@codesourcery.com>
+
+	PR c/81875
+	* testsuite/libgomp.c-c++-common/pr81875.c: New test.
+
 2017-09-14  Tom de Vries  <tom@codesourcery.com>
 
 	* testsuite/libgomp.c++/cancel-taskgroup-1.C: Remove.
diff --git a/libgomp/testsuite/libgomp.c-c++-common/pr81875.c b/libgomp/testsuite/libgomp.c-c++-common/pr81875.c
new file mode 100644
index 00000000000..3067d49a492
--- /dev/null
+++ b/libgomp/testsuite/libgomp.c-c++-common/pr81875.c
@@ -0,0 +1,46 @@
+/* { dg-do run } */
+
+extern
+#ifdef __cplusplus
+"C"
+#endif
+void abort (void);
+
+#define N 32ULL
+int a[N];
+
+const unsigned long long c = 0x7fffffffffffffffULL;
+
+void
+f2_tpf_static32 (void)
+{
+  unsigned long long i;
+  #pragma omp for
+  for (i = c + N; i > c; i -= 1ULL)
+    a[i - 1ULL - c] -= 4;
+}
+
+__attribute__((noinline, noclone)) int
+test_tpf_static32 (void)
+{
+  int i, j, k;
+  for (i = 0; i < N; i++)
+    a[i] = i - 25;
+
+  f2_tpf_static32 ();
+
+  for (i = 0; i < N; i++)
+    if (a[i] != i - 29)
+      return 1;
+
+  return 0;
+}
+
+int
+main ()
+{
+  if (test_tpf_static32 ())
+    abort ();
+
+  return 0;
+}