re PR target/74563 (Classic MIPS16 (non-MIPS16e) function return broken)

	PR target/74563
	* mips.md ({return,simple_return}_internal): Do not overwrite
	operands[0].

	PR target/74563
	* gcc.target/mips/pr74563: New test.

From-SVN: r246987

gcc/ChangeLog

+2017-04-18  Jeff Law  <law@redhat.com>
+
+	PR target/74563
+	* mips.md ({return,simple_return}_internal): Do not overwrite
+	operands[0].
+
 2017-04-18  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/80443

gcc/config/mips/mips.md

@@ -6585,7 +6585,6 @@
    (use (match_operand 0 "pmode_register_operand" ""))]
   ""
   {
-    operands[0] = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM);
     return mips_output_jump (operands, 0, -1, false);
   }
   [(set_attr "type"	"jump")

gcc/testsuite/ChangeLog

+2017-04-18  Jeff Law  <law@redhat.com>
+
+	PR target/74563
+	* gcc.target/mips/pr74563: New test.
+
 2017-04-18  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/80443

gcc/testsuite/gcc.target/mips/pr74563.c

+/* { dg-do compile } */
+/* { dg-options "-mips3 -mips16 -msoft-float" } */
+
+void f2(void);
+
+void f1(void)
+{
+        f2();
+}
+
+/* { dg-final { scan-assembler-not "\tjr\t\\\$31" } } */
+/* { dg-final { scan-assembler "\tjr\t\\\$7" } } */
+
+