r217427 - in /trunk/gcc: ChangeLog fold-const.c...

[mpolacek@gcc.gnu.org]

Author: mpolacek
Date: Wed Nov 12 14:36:41 2014
New Revision: 217427

URL: https://gcc.gnu.org/viewcvs?rev=217427&root=gcc&view=rev
Log:
	* fold-const.c (fold_binary_loc): Don't fold if the result
	is undefined.
	* match.pd (A + (-B) -> A - B, A - (-B) -> A + B,
	-(-A) -> A): Likewise.

	* c-c++-common/ubsan/overflow-sub-4.c: New test.
	* c-c++-common/ubsan/overflow-sub-2.c: Adjust dg-output.
	* c-c++-common/ubsan/overflow-int128.c: Likewise.

Added:
    trunk/gcc/testsuite/c-c++-common/ubsan/overflow-sub-4.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/match.pd
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/c-c++-common/ubsan/overflow-int128.c
    trunk/gcc/testsuite/c-c++-common/ubsan/overflow-sub-2.c