[AArch64] PR target/78362: Make sure to only take REGNO of a register

	PR target/78362
	* config/aarch64/aarch64.md (add<mode>3): Extract inner expression
	from a subreg in operands[1] and don't call REGNO on a non-reg
	expression when deciding to force operands[2] into a reg.

	* gcc.c-torture/compile/pr78362.c: New test.

From-SVN: r243011

gcc/ChangeLog

+2016-11-30  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	PR target/78362
+	* config/aarch64/aarch64.md (add<mode>3): Extract inner expression
+	from a subreg in operands[1] and don't call REGNO on a non-reg
+	expression when deciding to force operands[2] into a reg.
+
 2016-11-30  Claudiu Zissulescu  <claziss@synopsys.com>
 	    Andrew Burgess  <andrew.burgess@embecosm.com>
 

gcc/config/aarch64/aarch64.md

@@ -1611,11 +1611,15 @@
 	      (match_operand:GPI 2 "aarch64_pluslong_operand" "")))]
   ""
 {
+  /* If operands[1] is a subreg extract the inner RTX.  */
+  rtx op1 = REG_P (operands[1]) ? operands[1] : SUBREG_REG (operands[1]);
+
   /* If the constant is too large for a single instruction and isn't frame
      based, split off the immediate so it is available for CSE.  */
   if (!aarch64_plus_immediate (operands[2], <MODE>mode)
       && can_create_pseudo_p ()
-      && !REGNO_PTR_FRAME_P (REGNO (operands[1])))
+      && (!REG_P (op1)
+	 || !REGNO_PTR_FRAME_P (REGNO (op1))))
     operands[2] = force_reg (<MODE>mode, operands[2]);
 })
 

gcc/testsuite/ChangeLog

+2016-11-30  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	PR target/78362
+	* gcc.c-torture/compile/pr78362.c: New test.
+
 2016-11-30  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* lib/target-supports.exp (check_effective_target_freorder): Check

gcc/testsuite/gcc.c-torture/compile/pr78362.c

+/* PR target/78362.  */
+
+long a;
+
+void
+foo (void)
+{
+  for (;; a--)
+    if ((int) a)
+      break;
+}