[Bug middle-end/63879] [5 Regression] ICE compiling Linux Kernel fs/ext3/namei.c with -fsanitize=undefined

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63879

--- Comment #9 from Marek Polacek <mpolacek at gcc dot 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