1 files changed, 26 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/torture/pr91812.c b/gcc/testsuite/gcc.dg/torture/pr91812.c
new file mode 100644
index 00000000000..ebc67a01e33
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr91812.c
@@ -0,0 +1,26 @@
+/* { dg-do compile } */
+/* { dg-skip-if "" { *-*-* } { "-fno-fat-lto-objects" } { "" } } */
+/* { dg-options "-fdump-tree-optimized-blocks" } */
+
+unsigned register1;
+unsigned register2;
+
+void busy_wait_for_register (int x)
+{
+  volatile unsigned* ptr;
+  switch(x) {
+    case 0x1111:
+    ptr = &register1;
+    break;
+
+    case 0x2222:
+    ptr = &register2;
+    break;
+
+    default:
+    return;
+  }
+  while (*ptr) {}
+}
+
+/* { dg-final { scan-tree-dump "loop depth 1" "optimized" } } */