r250853 - in /trunk/gcc: ChangeLog fold-const.c...

[rguenth@gcc.gnu.org]

Author: rguenth
Date: Thu Aug  3 11:52:00 2017
New Revision: 250853

URL: https://gcc.gnu.org/viewcvs?rev=250853&root=gcc&view=rev
Log:
2017-08-03 Richard Biener  <rguenther@suse.de>

	PR middle-end/81148
	* fold-const.c (split_tree): Add minus_var and minus_con
	arguments, remove unused loc arg.  Never generate NEGATE_EXPRs
	here but always use minus_*.
	(associate_trees): Assert we never associate with MINUS_EXPR
	and NULL first operand.  Do not recurse for PLUS_EXPR operands
	when associating as MINUS_EXPR either.
	(fold_binary_loc): Track minus_var and minus_con.

	* c-c++-common/ubsan/pr81148.c: New testcase.

Added:
    trunk/gcc/testsuite/c-c++-common/ubsan/pr81148.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog