1 files changed, 20 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr21959.c b/gcc/testsuite/gcc.dg/tree-ssa/pr21959.c
new file mode 100644
index 000000000..decbcaf3a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr21959.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-vrp1" } */
+
+unsigned char c[0xFF];
+void f(void)
+{
+  unsigned char i;
+  c[128] = 128;
+  i = 0;
+  while (1)
+  {
+    /* This predicate should not be folded out.  */
+    if (((signed char) i) < 0) break;
+    c[i] = ' ';
+    i++;
+  }
+}
+
+/* { dg-final { scan-tree-dump-times "Folding predicate " 0 "vrp1" } } */
+/* { dg-final { cleanup-tree-dump "vrp1" } } */