Testcase for PR71785

gcc/testsuite/
	PR rtl-optimization/71785
	* gcc.target/powerpc/pr71785.c: New file.

From-SVN: r242665

gcc/testsuite/ChangeLog

+2016-11-21  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR rtl-optimization/71785
+	* gcc.target/powerpc/pr71785.c: New file.
+
 2016-11-21  Bin Cheng  <bin.cheng@arm.com>
 
 	PR testsuite/78114

gcc/testsuite/gcc.target/powerpc/pr71785.c

+/* { dg-do compile { target { powerpc*-*-* } } } */
+/* { dg-options "-O2" } */
+/* { dg-final { scan-assembler-not {\mb\M} } } */
+
+/* Check that all computed gotos in this testcase end up unfactored completely.
+   If some is not there will be a unconditional jump left; if all works fine,
+   all are gone.  */
+
+typedef enum opcode
+{
+	OP_A,
+	OP_B,
+	OP_END
+} opcode;
+
+typedef struct op
+{
+	opcode opcode;
+	int arg;
+} op;
+
+extern void do_stuff_b(int arg);
+extern void do_stuff_c(int arg);
+
+extern int someglobal;
+
+void
+eval(op *op)
+{
+	static const void *dispatch_table[] = {
+		&&CASE_OP_A,
+		&&CASE_OP_B,
+		&&CASE_OP_C,
+		&&CASE_OP_END
+	};
+
+	goto *dispatch_table[op->opcode];
+CASE_OP_A:
+	someglobal++;
+	op++;
+	goto *dispatch_table[op->opcode];
+CASE_OP_B:
+	do_stuff_b(op->arg);
+	op++;
+	goto *dispatch_table[op->opcode];
+CASE_OP_C:
+	do_stuff_c(op->arg);
+	op++;
+	goto *dispatch_table[op->opcode];
+CASE_OP_END:
+	return;
+}