[Bug tree-optimization/63381] New: Wrong constant folding

["ishiura-compiler at ml dot kwansei.ac.jp" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63381

            Bug ID: 63381
           Summary: Wrong constant folding
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ishiura-compiler at ml dot kwansei.ac.jp

GCC 5.0.0 for x86_64 miscompiles the following code.

   $ cat test.c

    int a = 0, b = 0, c = 0, d, e;
    int
    main (void)
    {
        d = ((20 % (1 != b)) && c) + 2147483647;
        e = 20 % (a >= 0);
        return 0;
    }

   $ x86_64-unknown-linux-gnu-gcc-5.0.0 test.c -Os
   $ ./a.out
   Floating point exception (core dumped)

   $ x86_64-unknown-linux-gnu-gcc-5.0.0 -v
    Using built-in specs.
    COLLECT_GCC=x86_64-unknown-linux-gnu-gcc-5.0.0
    COLLECT_LTO_WRAPPER=/usr/local/x86_64-tools/gcc-
    5.0.0/libexec/gcc/x86_64-unknown-linux-gnu/5.0.0/lto-wrapper
    Target: x86_64-unknown-linux-gnu
    Configured with: /home/orange3/gcc-master/configure --
    prefix=/usr/local/x86_64-tools/gcc-5.0.0/ --with-gmp=/usr/local/gmp-
    5.1.1/ --with-mpfr=/usr/local/mpfr-3.1.2/ --with-mpc=/usr/local/mpc-
    1.0.1/ --disable-multilib --disable-nls --enable-languages=c
    Thread model: posix
    gcc version 5.0.0 20140922 (experimental) (GCC)