i386: Correct costs on CONST_DOUBLE and CONST_VECTOR

We were always falling through to the memory default.
Also use standard_sse_constant_p on CONST_VECTOR.

        * config/i386/i386.c (ix86_rtx_costs): Use standard_sse_constant_p
        and don't fall thru from standard_80387_constant_p to the memory
        fallback,

From-SVN: r189007

gcc/ChangeLog

 2012-06-26  Richard Henderson  <rth@redhat.com>
 
+	* config/i386/i386.c (ix86_rtx_costs): Use standard_sse_constant_p
+	and don't fall thru from standard_80387_constant_p to the memory
+	fallback,
+
+2012-06-26  Richard Henderson  <rth@redhat.com>
+
 	* config/i386/i386.c (bdesc_args): Update.  Change
 	IX86_BUILTIN_VEC_WIDEN_SMUL_ODD_V4SI to OPTION_MASK_ISA_SSE2.
 	(IX86_BUILTIN_VEC_WIDEN_SMUL_EVEN_V4SI): New.

gcc/config/i386/i386.c

@@ -32102,24 +32102,38 @@ ix86_rtx_costs (rtx x, int code_i, int outer_code_i, int opno, int *total,
 
     case CONST_DOUBLE:
       if (mode == VOIDmode)
+	{
 	  *total = 0;
-      else
+	  return true;
+	}
       switch (standard_80387_constant_p (x))
 	{
 	case 1: /* 0.0 */
 	  *total = 1;
-	    break;
+	  return true;
 	default: /* Other constants */
 	  *total = 2;
-	    break;
+	  return true;
 	case 0:
 	case -1:
 	  break;
 	}
-      /* FALLTHRU */
-
+      if (SSE_FLOAT_MODE_P (mode))
+	{
     case CONST_VECTOR:
-      /* Start with (MEM (SYMBOL_REF)), since that's where
+	  switch (standard_sse_constant_p (x))
+	    {
+	    case 0:
+	      break;
+	    case 1:  /* 0: xor eliminates false dependency */
+	      *total = 0;
+	      return true;
+	    default: /* -1: cmp contains false dependency */
+	      *total = 1;
+	      return true;
+	    }
+	}
+      /* Fall back to (MEM (SYMBOL_REF)), since that's where
 	 it'll probably end up.  Add a penalty for size.  */
       *total = (COSTS_N_INSNS (1)
 		+ (flag_pic != 0 && !TARGET_64BIT)