[Bug tree-optimization/67191] [6 Regression] ICE: in before_dom_children, at tree-ssa-sccvn.c:4372

[antoine.balestrat at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67191

Antoine Balestrat <antoine.balestrat at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |antoine.balestrat at gmail dot 
com

--- Comment #5 from Antoine Balestrat <antoine.balestrat at gmail dot com> ---
Hello ! This simpler C testcase seemingly triggers the exact same ICE at -O1 on
my x86_64 machine :

$ cat tested.c
int a;
void f(void)
{
    int b;
    for(a=1; a;);
    for(; b; b++)
lbl:
        b || a;
    if(a)
        goto lbl;
}

$ xgcc -w -O1 tested.c
tested.c: In function ‘f’:
tested.c:11:1: internal compiler error: in before_dom_children, at
tree-ssa-sccvn.c:4372
 }
 ^
0xc66ffc sccvn_dom_walker::before_dom_children(basic_block_def*)
        ../../srcdir/gcc/tree-ssa-sccvn.c:4371
0x10c46a1 dom_walker::walk(basic_block_def*)
        ../../srcdir/gcc/domwalk.c:177
0xc681d6 run_scc_vn(vn_lookup_kind)
        ../../srcdir/gcc/tree-ssa-sccvn.c:4459
0xc3a3b2 execute
        ../../srcdir/gcc/tree-ssa-pre.c:4959
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.