reg-stack.c (get_true_reg): Reorder to fallthru to FLOAT case.

	* reg-stack.c (get_true_reg) <case FLOAT_TRUNCATE>: Reorder
	to fallthru to FLOAT case.

From-SVN: r264151

gcc/ChangeLog

+2018-09-06  Uros Bizjak  <ubizjak@gmail.com>
+
+	* reg-stack.c (get_true_reg) <case FLOAT_TRUNCATE>: Reorder
+	to fallthru to FLOAT case.
+
 2018-09-06  Will Schmidt  <will_schmidt@vnet.ibm.com>
 
 	PR target/86731

gcc/reg-stack.c

@@ -413,8 +413,9 @@ get_true_reg (rtx *pat)
 	/* Eliminate FP subregister accesses in favor of the
 	   actual FP register in use.  */
 	{
-	  rtx subreg;
-	  if (STACK_REG_P (subreg = SUBREG_REG (*pat)))
+	  rtx subreg = SUBREG_REG (*pat);
+
+	  if (STACK_REG_P (subreg))
 	    {
 	      int regno_off = subreg_regno_offset (REGNO (subreg),
 						   GET_MODE (subreg),
@@ -427,6 +428,12 @@ get_true_reg (rtx *pat)
 	  pat = &XEXP (*pat, 0);
 	  break;
 	}
+
+      case FLOAT_TRUNCATE:
+	if (!flag_unsafe_math_optimizations)
+	  return pat;
+	/* FALLTHRU */
+
       case FLOAT:
       case FIX:
       case FLOAT_EXTEND:
@@ -439,12 +446,6 @@ get_true_reg (rtx *pat)
 	  pat = &XVECEXP (*pat, 0, 0);
 	return pat;
 
-      case FLOAT_TRUNCATE:
-	if (!flag_unsafe_math_optimizations)
-	  return pat;
-	pat = &XEXP (*pat, 0);
-	break;
-
       default:
 	return pat;
       }