re PR rtl-optimization/1823 (-ftrapv aborts with pointer difference due to division optimization)

	PR optimization/1823
	* expmed.c (expand_divmod <EXACT_DIV_EXPR>): Use an unsigned
	multiplication to implement division by constant integer.

Co-Authored-By: Richard Henderson <rth@redhat.com>

From-SVN: r71116

gcc/ChangeLog

+2003-09-05  Roger Sayle  <roger@eyesopen.com>
+	    Richard Henderson  <rth@redhat.com>
+
+	PR optimization/1823
+	* expmed.c (expand_divmod <EXACT_DIV_EXPR>): Use an unsigned
+	multiplication to implement division by constant integer.
+
 Fri Sep  5 07:35:16 CEST 2003  Jan Hubicka  <jh@suse.cz>
 
 	* opts.c (decode_options): Enable unit-at-a-time at -O2.

gcc/expmed.c

@@ -3824,7 +3824,7 @@ expand_divmod (int rem_flag, enum tree_code code, enum machine_mode mode,
 			       build_int_2 (pre_shift, 0), NULL_RTX, unsignedp);
 	    quotient = expand_mult (compute_mode, t1,
 				    gen_int_mode (ml, compute_mode),
-				    NULL_RTX, 0);
+				    NULL_RTX, 1);
 
 	    insn = get_last_insn ();
 	    set_unique_reg_note (insn,