expmed.c (expand_divmod): Cast constant to unsigned HOST_WIDE_INT before negating.

	* expmed.c (expand_divmod) [TRUNC_MOD_EXPR, TRUNC_DIV_EXPR]: Cast
	constant to unsigned HOST_WIDE_INT before negating.

From-SVN: r120995

gcc/ChangeLog

 2007-01-19  Ian Lance Taylor  <iant@google.com>
 
+	* expmed.c (expand_divmod) [TRUNC_MOD_EXPR, TRUNC_DIV_EXPR]: Cast
+	constant to unsigned HOST_WIDE_INT before negating.
+
+2007-01-19  Ian Lance Taylor  <iant@google.com>
+
 	* tree-ssa-operands.h (struct vuse_vec_d): Change num_vuse field
 	to unsigned.
 	(VUSE_VECT_ELEMENT) [ENABLE_CHECKING]: Use unsigned comparison.

gcc/expmed.c

 /* Medium-level subroutines: convert bit-field store and extract
    and shifts, multiplies and divides to rtl instructions.
    Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
+   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
    Free Software Foundation, Inc.
 
 This file is part of GCC.
@@ -4174,7 +4174,9 @@ expand_divmod (int rem_flag, enum tree_code code, enum machine_mode mode,
 		int lgup, post_shift;
 		rtx mlr;
 		HOST_WIDE_INT d = INTVAL (op1);
-		unsigned HOST_WIDE_INT abs_d = d >= 0 ? d : -d;
+		unsigned HOST_WIDE_INT abs_d;
+
+		abs_d = d >= 0 ? d : - (unsigned HOST_WIDE_INT) d;
 
 		/* n rem d = n rem -d */
 		if (rem_flag && d < 0)