(movsf): Only generate stack temporary if used.

From-SVN: r7552

gcc/config/rs6000/rs6000.md

@@ -3763,8 +3763,6 @@
 
   if (GET_CODE (operands[1]) == REG && REGNO (operands[1]) < 32)
     {
-      rtx stack_slot = assign_stack_temp (SFmode, 4, 0);
-
       /* If this is a store to memory or another integer register do the
 	 move directly.  Otherwise store to a temporary stack slot and
 	 load from there into a floating point register.  */
@@ -3779,19 +3777,21 @@
 			  operand_subword (operands[1], 0, 0, SFmode));
 	  DONE;
 	}
+      else
+	{
+	  rtx stack_slot = assign_stack_temp (SFmode, 4, 0);
 
 	  emit_move_insn (stack_slot, operands[1]);
 	  emit_move_insn (operands[0], stack_slot);
 	  DONE;
 	}
+    }
 
   if (GET_CODE (operands[0]) == MEM)
     operands[1] = force_reg (SFmode, operands[1]);
 
   if (GET_CODE (operands[0]) == REG && REGNO (operands[0]) < 32)
     {
-      rtx stack_slot = assign_stack_temp (SFmode, 4, 0);
-
       if (GET_CODE (operands[1]) == MEM
 #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT && ! defined(REAL_IS_NOT_DOUBLE)
 	  || GET_CODE (operands[1]) == CONST_DOUBLE
@@ -3805,11 +3805,15 @@
 			  operand_subword (operands[1], 0, 0, SFmode));
 	  DONE;
 	}
+      else
+	{
+	  rtx stack_slot = assign_stack_temp (SFmode, 4, 0);
 
 	  emit_move_insn (stack_slot, operands[1]);
 	  emit_move_insn (operands[0], stack_slot);
 	  DONE;
 	}
+    }
 
   if (CONSTANT_P (operands[1]))
     {