[gcc r13-5378] tree-optimization/108523 - testcase for the bug

[Richard Biener]

https://gcc.gnu.org/g:1f6d05e9ad858b59b824f57d09400adcb2c5e4ad

commit r13-5378-g1f6d05e9ad858b59b824f57d09400adcb2c5e4ad
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Jan 26 08:38:35 2023 +0100

    tree-optimization/108523 - testcase for the bug
    
    This adds a reduced testcase for the PR.
    
            PR tree-optimization/108523
            * gcc.dg/torture/pr108523.c: New testcase.

Diff:
---
 gcc/testsuite/gcc.dg/torture/pr108523.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/gcc/testsuite/gcc.dg/torture/pr108523.c b/gcc/testsuite/gcc.dg/torture/pr108523.c
new file mode 100644
index 00000000000..a04160baf2a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr108523.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+
+int g_149, g_167, g_481;
+int main() {
+  int *l_1478 = &g_149;
+  *l_1478 ^= g_167;
+lbl_1481:
+  for (;;) {
+    g_481 = 1;
+    for (; g_481 < 100000; g_481 += 1) {
+      g_167 ^= *l_1478;
+      if (g_149)
+        goto lbl_1481;
+    }
+  }
+}