(aux_truncdfsf2): New pattern.

(movsf): Use it instead of invalid SUBREG and truncdfsf2.

From-SVN: r9902

gcc/config/rs6000/rs6000.md

@@ -2712,6 +2712,13 @@
   "frsp %0,%1"
   [(set_attr "type" "fp")])
 
+(define_insn "aux_truncdfsf2"
+  [(set (match_operand:SF 0 "gpc_reg_operand" "=f")
+	(unspec:SF [(match_operand:SF 1 "gpc_reg_operand" "f")] 0))]
+  "! TARGET_POWERPC && TARGET_HARD_FLOAT"
+  "frsp %0,%1"
+  [(set_attr "type" "fp")])
+
 (define_insn "negsf2"
   [(set (match_operand:SF 0 "gpc_reg_operand" "=f")
 	(neg:SF (match_operand:SF 1 "gpc_reg_operand" "f")))]
@@ -4082,11 +4089,12 @@
 	  /* If operands[1] is a register, it may have double-precision data
 	     in it, so truncate it to single precision.  We need not do
 	     this for POWERPC.  */
-	  if (! TARGET_POWERPC && GET_CODE (operands[1]) == REG)
+	  if (! TARGET_POWERPC && TARGET_HARD_FLOAT
+	      && GET_CODE (operands[1]) == REG)
 	    {
-	      rtx newreg = reload_in_progress ? operands[1] : gen_reg_rtx (SFmode);
-	      emit_insn (gen_truncdfsf2 (newreg,
-					 gen_rtx (SUBREG, DFmode, operands[1], 0)));
+	      rtx newreg
+		= reload_in_progress ? operands[1] : gen_reg_rtx (SFmode);
+	      emit_insn (gen_aux_truncdfsf2 (newreg, operands[1]));
 	      operands[1] = newreg;
 	    }