1 files changed, 29 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/opt/reg-stack4.C b/gcc/testsuite/g++.dg/opt/reg-stack4.C
new file mode 100644
index 000000000..b1b743416
--- /dev/null
+++ b/gcc/testsuite/g++.dg/opt/reg-stack4.C
@@ -0,0 +1,29 @@
+// PR target/12900
+// Origin: <snyder@fnal.gov>
+
+// This used to fail on x86 because the reg-stack pass
+// deleted a valid edge.
+
+// { dg-do compile }
+// { dg-options "-mtune=i586 -O2" { target { { i?86-*-* x86_64-*-* } && ilp32 } } }
+
+struct array {
+  double data;
+  virtual ~array();
+};
+
+double glob;
+double ext1(double);
+int nmuons;
+
+void track_match()
+{
+  array vecdca;
+  if (glob < 10) return;
+  double p = glob*5;
+  double phi = vecdca.data;
+  ext1 (vecdca.data-glob);
+  ext1 (phi*2);
+  if (1 < p)
+    ++nmuons; 
+}