1 files changed, 91 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/pr41295.c b/gcc/testsuite/gcc.dg/pr41295.c
new file mode 100644
index 00000000000..fabff63c923
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr41295.c
@@ -0,0 +1,91 @@
+/* { dg-do compile } */
+/* { dg-options "-O1 -g" } */
+
+enum reg_class
+{
+  BASE_REGS,
+  GENERAL_REGS,
+  LIM_REG_CLASSES
+};
+
+static __inline__ unsigned char
+hard_reg_set_subset_p (const unsigned long x[4], const unsigned long y[4])
+{
+  return ((x[0] & ~y[0]) == 0
+          && (x[1] & ~y[1]) == 0
+          && (x[2] & ~y[2]) == 0
+	  && (x[3] & ~y[3]) == 0);
+}
+
+static __inline__ unsigned char
+hard_reg_set_equal_p (const unsigned long x[4], const unsigned long y[4])
+{
+  return x[0] == y[0]
+         && x[1] == y[1]
+         && x[2] == y[2]
+         && x[3] == y[3];
+}
+
+extern unsigned long reg_class_contents[(int) LIM_REG_CLASSES][4];
+extern int ira_important_classes_num;
+extern enum reg_class ira_important_classes[(int) LIM_REG_CLASSES];
+extern enum reg_class ira_reg_class_intersect[(int) LIM_REG_CLASSES][(int)
+								     LIM_REG_CLASSES];
+extern unsigned char ira_reg_classes_intersect_p[(int) LIM_REG_CLASSES][(int)
+									LIM_REG_CLASSES];
+extern enum reg_class ira_reg_class_super_classes[(int) LIM_REG_CLASSES][(int)
+									 LIM_REG_CLASSES];
+static unsigned long temp_hard_regset[4];
+
+static void
+setup_reg_class_relations (void)
+{
+  int i, cl1, cl2, cl3;
+  unsigned long temp_set2[4];
+  for (cl1 = 0; cl1 < (int) LIM_REG_CLASSES; cl1++)
+    {
+      ira_reg_class_super_classes[cl1][0] = LIM_REG_CLASSES;
+      for (cl2 = 0; cl2 < (int) LIM_REG_CLASSES; cl2++)
+	{
+	  ira_reg_classes_intersect_p[cl1][cl2] = 0;
+	  {
+	    unsigned long *scan_tp_ = (temp_set2), *scan_fp_ =
+	      (reg_class_contents[cl2]);
+	    scan_tp_[1] = scan_fp_[1];
+	    scan_tp_[2] = scan_fp_[2];
+	    scan_tp_[3] = scan_fp_[3];
+	  }
+	  for (i = 0; i < ira_important_classes_num; i++)
+	    {
+	      cl3 = ira_important_classes[i];
+	      {
+		unsigned long *scan_tp_ = (temp_hard_regset), *scan_fp_ =
+		  (reg_class_contents[cl3]);
+		scan_tp_[0] = scan_fp_[0];
+		scan_tp_[1] = scan_fp_[1];
+		scan_tp_[3] = scan_fp_[3];
+	      }
+	      if (!hard_reg_set_subset_p (temp_hard_regset, temp_set2)
+		  || (hard_reg_set_equal_p (temp_hard_regset, temp_set2)
+		      && hard_reg_set_subset_p (reg_class_contents[cl3],
+						reg_class_contents[(int)
+								   ira_reg_class_intersect
+								   [cl1]
+								   [cl2]])))
+		ira_reg_class_intersect[cl1][cl2] = (enum reg_class) cl3;
+	    }
+	}
+    }
+}
+
+static void
+find_reg_class_closure (void)
+{
+  setup_reg_class_relations ();
+}
+
+void
+ira_init (void)
+{
+  find_reg_class_closure ();
+}