[Bug middle-end/67891] New: [6 Regression] FAIL: gcc.dg/pr43300.c (internal compiler error) on alpha-linux-gnu

[Bug middle-end/67891] New: [6 Regression] FAIL: gcc.dg/pr43300.c (internal compiler error) on alpha-linux-gnu

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67891

            Bug ID: 67891
           Summary: [6 Regression] FAIL: gcc.dg/pr43300.c (internal
                    compiler error) on alpha-linux-gnu
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ubizjak at gmail dot com
                CC: aoliva at gcc dot gnu.org
  Target Milestone: ---

r228175 introduced following testcase failure on alpha-linux-gnu:

FAIL: gcc.dg/pr43300.c (internal compiler error)
FAIL: gcc.dg/pr43300.c (test for excess errors)

The failure can be triggered with a crosscompiler from x86_64-linux-gnu to
alpha-linux-gnu:

~/gcc-build-alpha/gcc/cc1 -Os -quiet pr43300.c
pr43300.c: In function ‘foo’:
pr43300.c:8:1: internal compiler error: in adjust_one_expanded_partition_var,
at cfgexpand.c:1401
 foo (int x, V2SF a)
 ^
0x7b18e3 adjust_one_expanded_partition_var
        ../../gcc-svn/trunk/gcc/cfgexpand.c:1401
0x7c2a19 execute
        ../../gcc-svn/trunk/gcc/cfgexpand.c:6217
Please submit a full bug report,
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Subject: [Bug middle-end/67766] [6 Regression]: Bootstrap failure on alpha-linux-gnu: ICE in simplify_subreg, at simplify-rtx.c
Date: Thu, 08 Oct 2015 08:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67766

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Uroš Bizjak from comment #4)

> Bootstrap and regression test went OK [1].  There is however one new
> testsuite failure that looks related to your original patch from 2015-09-27:
> 
> FAIL: gcc.dg/pr43300.c (internal compiler error)
> FAIL: gcc.dg/pr43300.c (test for excess errors)

---> PR 67891
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Subject: [Bug target/67124] [6 Regression] wrong code at -O1, -O2 and -O3 on x86_64-linux-gnu
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idg124

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|rtl-optimization            |target

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think a fix is required for *movdi_internal.  Back to target bug.

[Bug middle-end/67891] [6 Regression] FAIL: gcc.dg/pr43300.c (internal compiler error) on alpha-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67891

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |6.0

[Bug middle-end/67891] [6 Regression] FAIL: gcc.dg/pr43300.c (internal compiler error) on alpha-linux-gnu

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67891

Alexandre Oliva <aoliva at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2015-10-09
           Assignee|unassigned at gcc dot gnu.org      |aoliva at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Mine.  Looking into it.

[Bug middle-end/67891] [6 Regression] FAIL: gcc.dg/pr43300.c (internal compiler error) on alpha-linux-gnu

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67891

--- Comment #2 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Created attachment 36469
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36469&action=edit
Patch that works around the problem

Ugh.  assign_parms's use of emit_block_move (as for parameter a in this
testcase) marks decls as addressable that weren't before, so they no longer
pass is_gimple_reg in spite of having SSA defs.  This is turn causes
set_parm_rtl to pass the parm down to set_rtl, instead of the default def, so
the RTL isn't associated with the partition holding the default def.  Oops.

Fortunately, ssa_default_def doesn't seem to mind being called for addressable
decls, so we can just skip the is_gimple_reg test.  I'm testing further to see
that this is indeed the case.

[Bug middle-end/67891] [6 Regression] FAIL: gcc.dg/pr43300.c (internal compiler error) on alpha-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67891

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri Oct  9 08:12:18 2015
New Revision: 228635

URL: https://gcc.gnu.org/viewcvs?rev=228635&root=gcc&view=rev
Log:
2015-10-09  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/67891
        * gimple-match.h (gimple_simplified_result_is_gimple_val):
        New helper.
        (gimple_resimplify1): Declare.
        (gimple_resimplify2): Likewise.
        (gimple_resimplify3): Likewise.
        * gimple-match-head.c (gimple_resimplify1): Export.
        (gimple_resimplify2): Likewise.
        (gimple_resimplify3): Likewise.
        (maybe_push_res_to_seq): Use gimple_simplified_result_is_gimple_val.
        * gimple-fold.c (gimple_fold_stmt_to_constant_1): Likewise.
        * tree-ssa-sccvn.c (visit_reference_op_load): Use gimple_resimplify1
        to avoid creating stmts without VN info.

        * gcc.dg/tree-ssa/pr67891.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr67891.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-fold.c
    trunk/gcc/gimple-match-head.c
    trunk/gcc/gimple-match.h
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-sccvn.c

[Bug middle-end/67891] [6 Regression] FAIL: gcc.dg/pr43300.c (internal compiler error) on alpha-linux-gnu

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67891

--- Comment #4 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Author: aoliva
Date: Fri Oct  9 12:18:58 2015
New Revision: 228652

URL: https://gcc.gnu.org/viewcvs?rev=228652&root=gcc&view=rev
Log:
[PR67891] don't test is_gimple_reg after parm expansion

for  gcc/ChangeLog

        PR middle-end/67891
        * cfgexpand.c (set_parm_rtl): Drop is_gimple_reg test.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cfgexpand.c

[Bug middle-end/67891] [6 Regression] FAIL: gcc.dg/pr43300.c (internal compiler error) on alpha-linux-gnu

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67891

Alexandre Oliva <aoliva at gcc dot gnu.org> changed:

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

--- Comment #5 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Fixed.  Richi's patch was for PR 67889.