[Bug middle-end/66945] New: ICE in generic_simplify (generic-match.c:24790)

[Bug middle-end/66945] New: ICE in generic_simplify (generic-match.c:24790)

[antoine.balestrat at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66945

            Bug ID: 66945
           Summary: ICE in generic_simplify (generic-match.c:24790)
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: antoine.balestrat at gmail dot com
  Target Milestone: ---

Hello !

This very pathological testcase seems to trigger an ICE with a freshly built
gcc.

$ xgcc --version
gcc (GCC) 6.0.0 20150720 (experimental)

$ cat tested.c
unsigned b;
f()
{
    for(;;)
        if(!b?:(b=0));
        else if(b%0<b?:b)
            for(;;);
}

$ xgcc -w -O1 tested.c
~/experiments/gcc/dist/bin/gcc -w -O1 tested.c
tested.c: In function ‘f’:
tested.c:2:1: internal compiler error: Segmentation fault
 f()
 ^
0xb7bd2f crash_signal
        ../../srcdir/gcc/toplev.c:352
0x91332d generic_simplify(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
        /home/antoine/gcc/objdir/gcc/generic-match.c:24790
0x826037 fold_binary_loc(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
        ../../srcdir/gcc/fold-const.c:9190
0xbc2eed cleanup_control_expr_graph
        ../../srcdir/gcc/tree-cfgcleanup.c:116
0xbc2eed cleanup_control_flow_bb
        ../../srcdir/gcc/tree-cfgcleanup.c:211
0xbc2eed cleanup_tree_cfg_bb
        ../../srcdir/gcc/tree-cfgcleanup.c:628
0xbc3548 cleanup_tree_cfg_1
        ../../srcdir/gcc/tree-cfgcleanup.c:681
0xbc3548 cleanup_tree_cfg_noloop
        ../../srcdir/gcc/tree-cfgcleanup.c:733
0xbc3548 cleanup_tree_cfg()
        ../../srcdir/gcc/tree-cfgcleanup.c:788
0xab7e44 execute_function_todo
        ../../srcdir/gcc/passes.c:1900
0xab8733 execute_todo
        ../../srcdir/gcc/passes.c:2005
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.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf944

zhykzhykzhyk at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |major

[Bug middle-end/66945] ICE in generic_simplify (generic-match.c:24790)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66945

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2015-07-21
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
(gdb) up
#1  0x0000000000a0c151 in fold_binary_loc (loc=2147483656, code=NE_EXPR, 
    type=<boolean_type 0x7ffff68d0d20 _Bool>, op0=<ssa_name 0x7ffff6a061f8>, 
    op1=<integer_cst 0x7ffff68e9000>)
    at /space/rguenther/tramp3d/trunk/gcc/fold-const.c:9068
9068      tem = generic_simplify (loc, code, type, op0, op1);
(gdb) p debug_tree (op0)
 <ssa_name 0x7ffff6a061f8 nothrowdef_stmt 

    version 13 in-free-list>
$1 = void


Mine.

[Bug middle-end/66945] ICE in generic_simplify (generic-match.c:24790)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66945

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ok, this is

  0 > unsigned

vs.

  X > X % Y

applying on

  0 > 0 % 0

...

[Bug middle-end/66945] ICE in generic_simplify (generic-match.c:24790)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66945

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.

[Bug middle-end/66945] ICE in generic_simplify (generic-match.c:24790)

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66945

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Jul 23 07:23:23 2015
New Revision: 226088

URL: https://gcc.gnu.org/viewcvs?rev=226088&root=gcc&view=rev
Log:
2015-07-23  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/66945
        * tree-ssa-propagate.c (substitute_and_fold_dom_walker
        ::before_dom_children): Force the propagators idea of
        non-executable edges to materialize, not what the folder
        chooses.

        * gcc.dg/torture/pr66945.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr66945.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-propagate.c