[Bug sanitizer/58413] ubsan constant folding

[mpolacek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58413

--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Wed Sep 25 08:58:57 2013
New Revision: 202886

URL: http://gcc.gnu.org/viewcvs?rev=202886&root=gcc&view=rev
Log:
    PR sanitizer/58413
c-family/
    * c-ubsan.c (ubsan_instrument_shift): Don't instrument
    an expression if we can prove it is correct.
    (ubsan_instrument_division): Likewise.  Remove unnecessary
    check.
testsuite/
    * c-c++-common/ubsan/shift-5.c: New test.
    * c-c++-common/ubsan/shift-6.c: New test.
    * c-c++-common/ubsan/div-by-zero-5.c: New test.
    * gcc.dg/ubsan/c-shift-1.c: New test.


Added:
    trunk/gcc/testsuite/c-c++-common/ubsan/div-by-zero-5.c
    trunk/gcc/testsuite/c-c++-common/ubsan/shift-5.c
    trunk/gcc/testsuite/c-c++-common/ubsan/shift-6.c
    trunk/gcc/testsuite/gcc.dg/ubsan/c-shift-1.c
Modified:
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-ubsan.c
    trunk/gcc/testsuite/ChangeLog