1 files changed, 58 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.c-torture/execute/20080519-1.c b/gcc/testsuite/gcc.c-torture/execute/20080519-1.c
new file mode 100644
index 000000000..303c4e65f
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/20080519-1.c
@@ -0,0 +1,58 @@
+extern void abort (void);
+
+typedef unsigned long HARD_REG_SET[2];
+HARD_REG_SET reg_class_contents[2];
+
+struct du_chain
+{
+  struct du_chain *next_use;
+  int cl;
+};
+
+void __attribute__((noinline))
+merge_overlapping_regs (HARD_REG_SET *p)
+{
+  if ((*p)[0] != -1 || (*p)[1] != -1)
+    abort ();
+}
+
+void __attribute__((noinline))
+regrename_optimize (struct du_chain *this)
+{
+  HARD_REG_SET this_unavailable;
+  unsigned long *scan_fp_;
+  int n_uses;
+  struct du_chain *last;
+
+  this_unavailable[0] = 0;
+  this_unavailable[1] = 0;
+
+  n_uses = 0;
+  for (last = this; last->next_use; last = last->next_use)
+    {
+      scan_fp_ = reg_class_contents[last->cl];
+      n_uses++;
+      this_unavailable[0] |= ~ scan_fp_[0];
+      this_unavailable[1] |= ~ scan_fp_[1];
+    }
+  if (n_uses < 1)
+    return;
+
+  scan_fp_ = reg_class_contents[last->cl];
+  this_unavailable[0] |= ~ scan_fp_[0];
+  this_unavailable[1] |= ~ scan_fp_[1];
+
+  merge_overlapping_regs (&this_unavailable);
+}
+
+int main()
+{
+  struct du_chain du1 = { 0, 0 };
+  struct du_chain du0 = { &du1, 1 };
+  reg_class_contents[0][0] = -1;
+  reg_class_contents[0][1] = -1;
+  reg_class_contents[1][0] = 0;
+  reg_class_contents[1][1] = 0;
+  regrename_optimize (&du0);
+  return 0;
+}