[Bug c/59139] New: internal compiler error: in get_val_for, at tree-ssa-loop-niter.c:2267

[Bug c/59139] New: internal compiler error: in get_val_for, at tree-ssa-loop-niter.c:2267

[regehr at cs dot utah.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59139

            Bug ID: 59139
           Summary: internal compiler error: in get_val_for, at
                    tree-ssa-loop-niter.c:2267
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: regehr at cs dot utah.edu

[regehr@imp test]$ gcc -O3 -c -Wall ./work20/reduce_55RZFl/small.c
./work20/reduce_55RZFl/small.c: In function ‘fn2’:
./work20/reduce_55RZFl/small.c:4:6: internal compiler error: in get_val_for, at
tree-ssa-loop-niter.c:2267
 void fn2() {
      ^
0xafe7c9 get_val_for
    /users/regehr/z/compiler-source/gcc/gcc/tree-ssa-loop-niter.c:2267
0xb0162b loop_niter_by_eval(loop*, edge_def*)
    /users/regehr/z/compiler-source/gcc/gcc/tree-ssa-loop-niter.c:2335
0xb01934 find_loop_niter_by_eval(loop*, edge_def**)
    /users/regehr/z/compiler-source/gcc/gcc/tree-ssa-loop-niter.c:2394
0xae4c5f canonicalize_loop_induction_variables
    /users/regehr/z/compiler-source/gcc/gcc/tree-ssa-loop-ivcanon.c:929
0xae682b canonicalize_induction_variables()
    /users/regehr/z/compiler-source/gcc/gcc/tree-ssa-loop-ivcanon.c:998
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.
[regehr@imp test]$ cat ./work20/reduce_55RZFl/small.c
int a, b, c, d, e;
int fn1(p1, p2) { return p2 == 0 ? p1 : 1 % p2; }

void fn2() {
  c = 0;
  for (;; c = (unsigned short)c) {
    b = 2;
    for (; b; b = a) {
      e = fn1(2, c && 1);
      d = c == 0 ? e : c;
      if (d)
        return;
    }
  }
}
[regehr@imp test]$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/mnt/local/randomtest/compiler-install/gcc-r204770-install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /users/regehr/z/compiler-source/gcc/configure
--prefix=/users/regehr/z/compiler-install/gcc-r204770-install
--enable-languages=c,c++ --enable-multilib
Thread model: posix
gcc version 4.9.0 20131114 (experimental) (GCC)
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/59131] Compiler segfaults while generating code to save local variables in transactional section
Date: Thu, 14 Nov 2013 23:36:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY131

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2013-11-14
     Ever confirmed|0                           |1

--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Nothing is attached.

[Bug tree-optimization/59139] [4.7/4.8/4.9 Regression] internal compiler error: in get_val_for, at tree-ssa-loop-niter.c:2267

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59139

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

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

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
I can't reproduce it anymore and wonder what fixed it.  Likely some constant
folding.

I wonder if a more appropriate fix would be to drop the gcc_unreachable ()
and just fold the thing.

I'll have a look.

[Bug tree-optimization/59139] [4.7/4.8/4.9 Regression] internal compiler error: in get_val_for, at tree-ssa-loop-niter.c:2267

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59139

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2

[Bug tree-optimization/59139] [4.7/4.8/4.9 Regression] internal compiler error: in get_val_for, at tree-ssa-loop-niter.c:2267

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59139

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Dec  2 15:43:01 2013
New Revision: 205588

URL: http://gcc.gnu.org/viewcvs?rev=205588&root=gcc&view=rev
Log:
2013-12-02  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/59139
    * tree-ssa-loop-niter.c (chain_of_csts_start): Properly match
    code in get_val_for.
    (get_val_for): Use gcc_checking_asserts.

    * gcc.dg/torture/pr59139.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr59139.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-loop-niter.c

[Bug tree-optimization/59139] [4.7/4.8/4.9 Regression] internal compiler error: in get_val_for, at tree-ssa-loop-niter.c:2267

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59139

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Dec  2 15:43:47 2013
New Revision: 205589

URL: http://gcc.gnu.org/viewcvs?rev=205589&root=gcc&view=rev
Log:
2013-12-02  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/59139
    * tree-ssa-loop-niter.c (chain_of_csts_start): Properly match
    code in get_val_for.
    (get_val_for): Use gcc_checking_asserts.

    * gcc.dg/torture/pr59139.c: New testcase.

Added:
    branches/gcc-4_8-branch/gcc/testsuite/gcc.dg/torture/pr59139.c
Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_8-branch/gcc/tree-ssa-loop-niter.c

[Bug tree-optimization/59139] [4.7 Regression] internal compiler error: in get_val_for, at tree-ssa-loop-niter.c:2267

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59139

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |4.8.3, 4.9.0
            Summary|[4.7/4.8/4.9 Regression]    |[4.7 Regression] internal
                   |internal compiler error: in |compiler error: in
                   |get_val_for, at             |get_val_for, at
                   |tree-ssa-loop-niter.c:2267  |tree-ssa-loop-niter.c:2267
      Known to fail|4.9.0                       |

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed for 4.8.3 sofar.

[Bug tree-optimization/59139] [4.7 Regression] internal compiler error: in get_val_for, at tree-ssa-loop-niter.c:2267

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59139

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Mar 17 14:38:55 2014
New Revision: 208618

URL: http://gcc.gnu.org/viewcvs?rev=208618&root=gcc&view=rev
Log:
2014-03-17  Richard Biener  <rguenther@suse.de>

    Backport from mainline
    2013-05-21  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/57303
    * tree-ssa-sink.c (statement_sink_location): Properly handle
    self-assignments.

    * gcc.dg/torture/pr57303.c: New testcase.

    2013-12-02  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/59139
    * tree-ssa-loop-niter.c (chain_of_csts_start): Properly match
    code in get_val_for.
    (get_val_for): Use gcc_checking_asserts.

    * gcc.dg/torture/pr59139.c: New testcase.

    2014-02-14  Richard Biener  <rguenther@suse.de>

    PR tree-optimization/60183
    * tree-ssa-phiprop.c (propagate_with_phi): Avoid speculating
    loads.
    (tree_ssa_phiprop): Calculate and free post-dominators.

    * gcc.dg/torture/pr60183.c: New testcase.

Added:
    branches/gcc-4_7-branch/gcc/testsuite/gcc.dg/torture/pr57303.c
    branches/gcc-4_7-branch/gcc/testsuite/gcc.dg/torture/pr59139.c
    branches/gcc-4_7-branch/gcc/testsuite/gcc.dg/torture/pr60183.c
Modified:
    branches/gcc-4_7-branch/gcc/ChangeLog
    branches/gcc-4_7-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_7-branch/gcc/tree-ssa-loop-niter.c
    branches/gcc-4_7-branch/gcc/tree-ssa-phiprop.c
    branches/gcc-4_7-branch/gcc/tree-ssa-sink.c

[Bug tree-optimization/59139] [4.7 Regression] internal compiler error: in get_val_for, at tree-ssa-loop-niter.c:2267

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59139

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

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

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.