r217766 - in /trunk/gcc: ChangeLog fold-const.c...

[mpolacek@gcc.gnu.org]

Author: mpolacek
Date: Wed Nov 19 12:03:04 2014
New Revision: 217766

URL: https://gcc.gnu.org/viewcvs?rev=217766&root=gcc&view=rev
Log:
	PR sanitizer/63879
	* fold-const.c (negate_expr_p) <case NEGATE_EXPR>: Return
	!TYPE_OVERFLOW_SANITIZED.
	(fold_negate_expr) <case INTEGER_CST>: Fold when overflow
	does not trap and when overflow wraps, or when SANITIZE_SI_OVERFLOW
	is 0.

	* c-c++-common/ubsan/pr63879-1.c: New test.
	* c-c++-common/ubsan/pr63879-2.c: New test.

Added:
    trunk/gcc/testsuite/c-c++-common/ubsan/pr63879-1.c
    trunk/gcc/testsuite/c-c++-common/ubsan/pr63879-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog