Do not generate mem->mem SF moves if -msoft-float

From-SVN: r9408

gcc/config/rs6000/rs6000.md

@@ -3923,7 +3923,10 @@
       && REGNO (SUBREG_REG (operands[1])) < FIRST_PSEUDO_REGISTER)
     operands[1] = alter_subreg (operands[1]);
 
-  if (TARGET_HARD_FLOAT)
+  if (TARGET_SOFT_FLOAT && GET_CODE (operands[0]) == MEM)
+    operands[1] = force_reg (SFmode, operands[1]);
+
+  else if (TARGET_HARD_FLOAT)
     {
       if (GET_CODE (operands[1]) == REG && REGNO (operands[1]) < 32)
 	{
@@ -3956,7 +3959,7 @@
 	  /* 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 && TARGET_HARD_FLOAT && GET_CODE (operands[1]) == REG)
+	  if (! TARGET_POWERPC && GET_CODE (operands[1]) == REG)
 	    {
 	      rtx newreg = reload_in_progress ? operands[1] : gen_reg_rtx (SFmode);
 	      emit_insn (gen_truncdfsf2 (newreg,