[wide-int] Remove SHIFT_COUNT_TRUNCATED uses at tree/gimple level

[Richard Sandiford]

Following the removal of SHIFT_COUNT_TRUNCATED from double-int, this patch
reverts the changed I'd made to mimic the old behaviour on wide-int.

Tested on powerpc64-linux-gnu and by assembly comparison on a range of targets.
OK to install?

Thanks,
Richard


Index: gcc/fold-const.c
===================================================================
--- gcc/fold-const.c	2013-11-05 13:06:56.985255941 +0000
+++ gcc/fold-const.c	2013-11-05 13:12:28.805655903 +0000
@@ -1007,13 +1007,9 @@ int_const_binop_1 (enum tree_code code,
 	/* It's unclear from the C standard whether shifts can overflow.
 	   The following code ignores overflow; perhaps a C standard
 	   interpretation ruling is needed.  */
-	res = wi::rshift (arg1, arg2, sign,
-			  SHIFT_COUNT_TRUNCATED
-			  ? GET_MODE_BITSIZE (TYPE_MODE (type)) : 0);
+	res = wi::rshift (arg1, arg2, sign);
       else
-	res = wi::lshift (arg1, arg2,
-			  SHIFT_COUNT_TRUNCATED
-			  ? GET_MODE_BITSIZE (TYPE_MODE (type)) : 0);
+	res = wi::lshift (arg1, arg2);
       break;
       
     case RROTATE_EXPR:
Index: gcc/tree-ssa-ccp.c
===================================================================
--- gcc/tree-ssa-ccp.c	2013-11-05 13:07:25.659474362 +0000
+++ gcc/tree-ssa-ccp.c	2013-11-05 13:12:28.806655910 +0000
@@ -1272,20 +1272,15 @@ bit_value_binop_1 (enum tree_code code,
 		  else
 		    code = RSHIFT_EXPR;
 		}
-	      int shift_precision = SHIFT_COUNT_TRUNCATED ? width : 0;
 	      if (code == RSHIFT_EXPR)
 		{
-		  *mask = wi::rshift (wi::ext (r1mask, width, sgn),
-				      shift, sgn, shift_precision);
-		  *val = wi::rshift (wi::ext (r1val, width, sgn),
-				     shift, sgn, shift_precision);
+		  *mask = wi::rshift (wi::ext (r1mask, width, sgn), shift, sgn);
+		  *val = wi::rshift (wi::ext (r1val, width, sgn), shift, sgn);
 		}
 	      else
 		{
-		  *mask = wi::ext (wi::lshift (r1mask, shift, shift_precision),
-				   width, sgn);
-		  *val = wi::ext (wi::lshift (r1val, shift, shift_precision),
-				  width, sgn);
+		  *mask = wi::ext (wi::lshift (r1mask, shift), width, sgn);
+		  *val = wi::ext (wi::lshift (r1val, shift), width, sgn);
 		}
 	    }
 	}