[Bug tree-optimization/64357] New: ICE at -Os on x86_64-linux-gnu in check_loop_closed_ssa_use, at tree-ssa-loop-manip.c:579

[Bug tree-optimization/64357] New: ICE at -Os on x86_64-linux-gnu in check_loop_closed_ssa_use, at tree-ssa-loop-manip.c:579

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64357

            Bug ID: 64357
           Summary: ICE at -Os on x86_64-linux-gnu in
                    check_loop_closed_ssa_use, at
                    tree-ssa-loop-manip.c:579
           Product: gcc
           Version: 5.0
            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
-Os on x86_64-linux-gnu in both 32-bit and 64-bit modes. 

It is a regression from 4.9.x.

$ 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/5.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 5.0.0 20141218 (experimental) [trunk revision 218871] (GCC) 

$ 
$ gcc-trunk -O1 -c small.c
$ gcc-trunk -O2 -c small.c
$ gcc-4.9 -Os -c small.c
$ 
$ gcc-trunk -Os -c small.c
small.c: In function ‘fn3’:
small.c:25:1: internal compiler error: in check_loop_closed_ssa_use, at
tree-ssa-loop-manip.c:579
 fn3 ()
 ^
0xbb7c5f check_loop_closed_ssa_use
    ../../gcc-trunk/gcc/tree-ssa-loop-manip.c:579
0xbb97da verify_loop_closed_ssa(bool)
    ../../gcc-trunk/gcc/tree-ssa-loop-manip.c:624
0x9a8026 execute_function_todo
    ../../gcc-trunk/gcc/passes.c:1955
0x9a88b3 execute_todo
    ../../gcc-trunk/gcc/passes.c:1997
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.
$ 


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


int a, b, c, d, e, f;

long long
fn1 (int p)
{
  return p ? p : 1;
}

static int
fn2 ()
{
lbl:
  for (; f;)
    return 0;
  for (;;)
    {
      for (b = 0; b; ++b)
    if (d)
      goto lbl;
      c = e;
    }
}

void
fn3 ()
{
  for (; a; a = fn1 (a))
    {
      fn2 ();
      e = 0;
    }
}
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Subject: [Bug tree-optimization/64357] [5 Regression] ICE at -Os on x86_64-linux-gnu in check_loop_closed_ssa_use, at tree-ssa-loop-manip.c:579
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd357

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-12-19
                 CC|                            |jakub at gcc dot gnu.org
   Target Milestone|---                         |5.0
            Summary|ICE at -Os on               |[5 Regression] ICE at -Os
                   |x86_64-linux-gnu in         |on x86_64-linux-gnu in
                   |check_loop_closed_ssa_use,  |check_loop_closed_ssa_use,
                   |at                          |at
                   |tree-ssa-loop-manip.c:579   |tree-ssa-loop-manip.c:579
     Ever confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r216304.

[Bug tree-optimization/64357] [5 Regression] ICE at -Os on x86_64-linux-gnu in check_loop_closed_ssa_use, at tree-ssa-loop-manip.c:579

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64357

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine.

[Bug tree-optimization/64357] [5 Regression] ICE at -Os on x86_64-linux-gnu in check_loop_closed_ssa_use, at tree-ssa-loop-manip.c:579

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64357

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Jan 12 15:34:37 2015
New Revision: 219473

URL: https://gcc.gnu.org/viewcvs?rev=219473&root=gcc&view=rev
Log:
2015-01-12  Richard Biener  <rguenther@suse.de>

    PR middle-end/64357
    * tree-cfg.c (gimple_can_merge_blocks_p): Protect simple
    latches properly.

    * gcc.dg/torture/pr64357.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr64357.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-cfg.c

[Bug tree-optimization/64357] [5 Regression] ICE at -Os on x86_64-linux-gnu in check_loop_closed_ssa_use, at tree-ssa-loop-manip.c:579

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64357

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.