[Bug tree-optimization/69213] New: g++ ICE (segfault) at -O1 and above on x86_64-linux-gnu in "add_dependency"

[helloqirun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69213

            Bug ID: 69213
           Summary: g++ ICE (segfault) at -O1 and above on
                    x86_64-linux-gnu in "add_dependency"
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: helloqirun at gmail dot com
  Target Milestone: ---

The following code causes an ICE when compiled with the current g++ trunk at
-O1 and above on x86_64-linux-gnu in both 32-bit and 64-bit modes.


$ g++-trunk  -v
Using built-in specs.
COLLECT_GCC=g++-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20160109 (experimental) [trunk revision 232190] (GCC)



$ g++-trunk -c -O3 abc.c
abc.c: In function ?void fn1()?:
abc.c:2:40: error: invalid 'asm': operand number out of range
 void fn1() { __asm__("add %w0%w1%w2" :); }
                                        ^

abc.c:2:40: error: invalid 'asm': operand number out of range
abc.c:2:40: error: invalid 'asm': operand number out of range
abc.c: In function ?int main()?:
abc.c:3:1: internal compiler error: Segmentation fault
 main() {
 ^~~~

0xd04cdf crash_signal
        ../../gcc/gcc/toplev.c:334
0xe3c08d add_dependency
        ../../gcc/gcc/tree-ssa-loop-im.c:419
0xe3c399 determine_max_movement
        ../../gcc/gcc/tree-ssa-loop-im.c:743
0xe3d833 invariantness_dom_walker::before_dom_children(basic_block_def*)
        ../../gcc/gcc/tree-ssa-loop-im.c:1080
0x13858e2 dom_walker::walk(basic_block_def*)
        ../../gcc/gcc/domwalk.c:265
0xe4005f tree_ssa_lim
        ../../gcc/gcc/tree-ssa-loop-im.c:2518
0xe4005f execute
        ../../gcc/gcc/tree-ssa-loop-im.c:2572
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.



------
$ cat abc.cc
int a, b;
void fn1() { __asm__("add %w0%w1%w2" :); }
main() {
  for (; a < 0; b++)
    a = b;
}