[Bug tree-optimization/58342] New: ICE in propagate_threaded_block_debug_into, at tree-ssa-threadedge.c:623

[su at cs dot ucdavis.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58342

            Bug ID: 58342
           Summary: ICE in propagate_threaded_block_debug_into, at
                    tree-ssa-threadedge.c:623
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

The following code causes an ICE when compiled with the current gcc trunk at
-O2 and -O3 with -g on x86_64-linux (both 32-bit and 64-bit modes). 

This is a regression from 4.8.x. 

This may be the same as 58340, but I couldn't reproduce the ICE using the
testcase for 58340 (see below for pt.ii). 


$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure
--enable-languages=c,c++,objc,obj-c++,fortran,lto
--with-gmp=/usr/local/gcc-trunk --with-mpfr=/usr/local/gcc-trunk
--with-mpc=/usr/local/gcc-trunk --with-cloog=/usr/local/gcc-trunk
--prefix=/usr/local/gcc-trunk
Thread model: posix
gcc version 4.9.0 20130906 (experimental) [trunk revision 202308] (GCC) 
$
$ gcc-trunk -m32 -O2 -c small.c
$ gcc-trunk -O2 -c small.c
$ gcc-4.8 -O2 -g -c small.c  
$ gcc-trunk -O2 -g -c small.c
small.c: In function ‘main’:
small.c:8:5: internal compiler error: in propagate_threaded_block_debug_into,
at tree-ssa-threadedge.c:623
 int main ()
     ^
0xa93f53 propagate_threaded_block_debug_into(basic_block_def*,
basic_block_def*)
    ../../gcc-trunk/gcc/tree-ssa-threadedge.c:623
0xa94ca2 thread_across_edge(gimple_statement_d*, edge_def*, bool,
vec<tree_node*, va_heap, vl_ptr>*, tree_node* (*)(gimple_statement_d*,
gimple_statement_d*))
    ../../gcc-trunk/gcc/tree-ssa-threadedge.c:1019
0x9fcc34 dom_opt_leave_block
    ../../gcc-trunk/gcc/tree-ssa-dom.c:1898
0xd46ebf walk_dominator_tree(dom_walk_data*, basic_block_def*)
    ../../gcc-trunk/gcc/domwalk.c:241
0x9faa02 tree_ssa_dominator_optimize
    ../../gcc-trunk/gcc/tree-ssa-dom.c:827
0x9faa02 execute
    ../../gcc-trunk/gcc/tree-ssa-dom.c:951
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.
$
$
$ gcc-trunk -O2 -g -c pt.ii
$



-------------------------------------


int a, b, c, d;

int foo (int x, int y)
{
  return y == 0 ? x : 1 % y;
}

int main ()
{
  c = 0 || a;

  for (;;)
    b = foo (d, c) && 1;

  return 0;
}