[Bug c++/65851] New: ice in set_lattice_value at tree-ssa-cc p.c:535

[Bug c++/65851] New: ice in set_lattice_value at tree-ssa-cc p.c:535

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65851

            Bug ID: 65851
           Summary: ice in set_lattice_value at tree-ssa-cc p.c:535
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com

Created attachment 35386
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35386&action=edit
gzipped C++ source code

The attached code, when compiled by gcc trunk dated 20150422, 
with flag -O2 on x86_64, does this

bug201.cc: In member function ‘void CamWnd::Cam_Draw()’:
bug201.cc:95609:6: internal compiler error: in set_lattice_value, at
tree-ssa-cc
p.c:535
 void CamWnd::Cam_Draw() {
      ^
0xed5857 set_lattice_value
    ../../src/trunk/gcc/tree-ssa-ccp.c:535
0xedacdc visit_assignment
    ../../src/trunk/gcc/tree-ssa-ccp.c:2290
0xedacdc ccp_visit_stmt
    ../../src/trunk/gcc/tree-ssa-ccp.c:2364
0xf63174 simulate_stmt
    ../../src/trunk/gcc/tree-ssa-propagate.c:348

This might be related to bug # 63914.
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Subject: [Bug target/65837] [arm-linux-gnueabihf] lto1 target specific builtin not available
Date: Wed, 22 Apr 2015 21:29:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide837

--- Comment #4 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
(In reply to prathamesh3492 from comment #3)
> Hi,
> I tried to reproduce the error with a reduced test-case:
>
> #include "arm_neon.h"
>
> float32x2_t a, b, c, e;
>
> int main()
> {
>   e = __builtin_neon_vmls_lanev2sf (a, b, c, 0);
>   return 0;
> }
>
> arm-linux-gnueabihf-gcc -mfpu=neon test.c -flto test.c -c
> arm-linux-gnueabihf-gcc test.o -flto -o test
> lto1: fatal error: target specific builtin not available
> compilation terminated.

Ofcourse, that's expected behaviour - you don't have support for the SIMD
intrinsics if you don't ask for it on the command line or your compiler doesn't
default to generating code for the SIMD unit.

> lto-wrapper: fatal error:
> /home/prathamesh.kulkarni/gnu-toolchain/gcc-chromium-arm-linux-gnueabihf/
> builds/destdir/x86_64-unknown-linux-gnu/bin/arm-linux-gnueabihf-gcc returned
> 1 exit status
> compilation terminated.
>
> However passing -mfpu=neon for linking works:
> arm-linux-gnueabihf-gcc -mfpu=neon test.o -flto -o test
>
> I suppose similar thing must be happening during linking
> libshared_memory_support.so for chromium build ?
> I couldn't see -mfpu=neon in the command line used for linking
> libshared_memory_support.so

RESOLVED INVALID then ?

regards
Ramana

>
> Thank you
> Prathamesh

[Bug c++/65851] ice in set_lattice_value at tree-ssa-cc p.c:535

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65851

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marxin at gcc dot gnu.org

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Running creduce and isolating culprit commit.
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Subject: [Bug middle-end/65855] missing optimization: triangular numbers
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide855

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

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----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2015-04-23
           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> ---
For some reason we can't compute the number of iterations of this loop which is
because we have to assume that

 (long unsigned int) n_3(D) != 18446744073709551615

and for some reason we couldn't simplify that to true!?

  if (!exit_must_be_taken && !POINTER_TYPE_P (type))
    {
      if (integer_nonzerop (iv0->step))
        assumption = fold_build2 (NE_EXPR, boolean_type_node,
                                  iv1->base, TYPE_MAX_VALUE (type));

if we fix that we fail in the following way:

(chrec_apply
  (varying_loop = 1
)
  (chrec = {1, +, {2, +, 1}_1}_1)
  (x = (long unsigned int) n_3(D) + 18446744073709551615)
  (res = scev_not_known))
not replacing:
  t_4 = PHI <t_5(3)>

because we can't compute the final result expression.

[Bug c++/65851] ice in set_lattice_value at tree-ssa-cc p.c:535

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65851

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2015-04-23
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine.  Waiting for a reduced testcase though.

[Bug c++/65851] ice in set_lattice_value at tree-ssa-cc p.c:535

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65851

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
We are transitioning from known-bits (likely alignment) to an invariant (thus
constant).  Most of the cases this happens because of too weak UNDEFINED
handling.
I suppose we should finally punt in making that "correct" and simply drop that
lattice transition...  (we already to sth similar for known-bits to
known-bits).

The assert is really there to catch this kind of missed optimizations, in
theory
we can just reject invalid transitions...

[Bug c++/65851] ice in set_lattice_value at tree-ssa-cc p.c:535

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65851

--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 35389
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35389&action=edit
reduced test case
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida534

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dcb314 at hotmail dot com

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
*** Bug 53131 has been marked as a duplicate of this bug. ***

[Bug c++/65851] ice in set_lattice_value at tree-ssa-cc p.c:535

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65851

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |trippels at gcc dot gnu.org

--- Comment #6 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
*** Bug 65907 has been marked as a duplicate of this bug. ***

[Bug c++/65851] ice in set_lattice_value at tree-ssa-cc p.c:535

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65851

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Apr 28 07:26:41 2015
New Revision: 222510

URL: https://gcc.gnu.org/viewcvs?rev=222510&root=gcc&view=rev
Log:
2015-04-28  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/65851
        * tree-ssa-ccp.c (set_lattice_value): Perform a meet when
        changing CONSTANT to CONSTANT non-copy.  Get new_val by reference.
        (ccp_lattice_meet): Remove stray argument.  Use operand_equal_p
        rather than simple_cst_equal as the latter doesn't handle COMPLEX_CST.
        (ccp_visit_phi_node): Adjust.
        (evaluate_stmt): For simplifications to SSA names return its
        lattice value if that isn't VARYING.  Return immediately when
        simplified to a constant.
        (visit_assignment): Adjust.
        (ccp_visit_stmt): Likewise.

        * g++.dg/torture/pr65851.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/torture/pr65851.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-ccp.c

[Bug c++/65851] ice in set_lattice_value at tree-ssa-cc p.c:535

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65851

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.