[Bug target/64113] New: Gcc on Alpha: Error: No lda !gpdisp!282 was found

[Bug target/64113] New: Gcc on Alpha: Error: No lda !gpdisp!282 was found

[mcree at orcon dot net.nz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64113

            Bug ID: 64113
           Summary: Gcc on Alpha: Error: No lda !gpdisp!282 was found
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mcree at orcon dot net.nz
            Target: alpha-linux-gnu

gcc-4.9.x (and the trunk a couple of weeks ago) compiling certain software
packages (e.g. systemd) on an Alpha running Debian Alpha Linux results in
errors at the link stage such as:

{standard input}: Assembler messages:
{standard input}:5327: Error: No lda !gpdisp!282 was found
lto-wrapper: gcc returned 1 exit status
/usr/bin/ld: lto-wrapper failed
collect2: error: ld returned 1 exit status

These packages are successfully compiled with gcc-4.8.x.  

I have not been able to construct a minimal source exhibiting the problem.  But
because gcc-4.9.0 exhibits the failure and gcc-4.8.0 compiles the code
successfully I have been able to bisect to the first commit in gcc that
produces those errors, and that commit is:

commit c59258dcb37171743fdc6d393e767834aac9642b
Author: law <law@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Tue Nov 12 16:41:51 2013 +0000

        * gimple-ssa-isolate-paths.c (check_loadstore): New function.
        (insert_trap_and_remove_trailing_statements): New argument OP which
        is the NULL pointer.  Emit the trap after the load/store through
        the NULL pointer.  Simplify the RHS of a store through a NULL pointer
        when trivial to do so.
        (isolate_path): Corresponding changes.
        (gimple_ssa_isolate_erroneous_path): Likewise.

        * gcc.dg/tree-ssa/isolate-1.c: Update expected output.
        * gcc.dg/tree-ssa/isolate-5.c: New test.

    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@204708
138bc75d-0d04-0410-961f-82ee72b054a4

[Bug target/64113] Gcc on Alpha: Error: No lda !gpdisp!282 was found

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64113

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2014-12-01
           Assignee|unassigned at gcc dot gnu.org      |ubizjak at gmail dot com
   Target Milestone|---                         |4.9.3
     Ever confirmed|0                           |1

--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
This is actually a target problem, the quoted patch just exposed it.

The problem is in the way call to __tls_get_addr is split. Currently, when the
gp register is not used, life analysis removes only UNSPEC_LDGP2 - the last
part of the sequence. This call has to be split with a peephole2, in the same
way other calls are handled. alpha.md has the comment that says:

;; We must use peep2 instead of a split because we need accurate life
;; information for $gp.  Consider the case of { bar(); while (1); }.

I have the patch in testing.
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Subject: [Bug target/64113] Gcc on Alpha: Error: No lda !gpdisp!282 was found
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64113

--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 34157
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34157&action=edit
Proposed patch

Patch in testing.

Using this patch, I was able to compile systemd-217 that otherwise failed to
compile with the reported error.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd144

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
But that one doesn't block because wait_for() returns future_status::ready
immediately ... it was failing due to some local changes I had. So I think this
is a false alarm.

[Bug target/64113] Gcc on Alpha: Error: No lda !gpdisp!282 was found

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64113

--- Comment #3 from uros at gcc dot gnu.org ---
Author: uros
Date: Tue Dec  2 10:04:14 2014
New Revision: 218264

URL: https://gcc.gnu.org/viewcvs?rev=218264&root=gcc&view=rev
Log:
    PR target/64113
    * config/alpha/alpha.md (call_value_osf_tlsgd): Do not split insn
    using post-reload splitter.  Use peephole2 pass instead.
    (call_value_osf_tlsldm): Ditto.
    (TLS_CALL): New int iterator.
    (tls): New int attribute.
    (call_value_osf_<tls>): Merge insn pattern from call_value_osf_tlsgd
    and call_value_tlsldm using TLS_CALL int iterator.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/alpha/alpha.md

[Bug target/64113] Gcc on Alpha: Error: No lda !gpdisp!282 was found

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64113

--- Comment #4 from uros at gcc dot gnu.org ---
Author: uros
Date: Tue Dec  2 19:29:28 2014
New Revision: 218282

URL: https://gcc.gnu.org/viewcvs?rev=218282&root=gcc&view=rev
Log:
    PR target/64113
    * config/alpha/alpha.md (call_value_osf_tlsgd): Do not split insn
    using post-reload splitter.  Use peephole2 pass instead.
    (call_value_osf_tlsldm): Ditto.
    (TLS_CALL): New int iterator.
    (tls): New int attribute.
    (call_value_osf_<tls>): Merge insn pattern from call_value_osf_tlsgd
    and call_value_tlsldm using TLS_CALL int iterator.


Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/config/alpha/alpha.md

[Bug target/64113] Gcc on Alpha: Error: No lda !gpdisp!282 was found

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64113

Uroš Bizjak <ubizjak at gmail dot com> changed:

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

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
Fixed for 4.9.3+.
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Subject: [Bug rtl-optimization/64156] Subversion id 218266 breaks the big-endian 64-bit PowerPC build (wilco.dijkstra@arm.com's mod to ira-costs.c)
Date: Tue, 02 Dec 2014 19:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd156

--- Comment #2 from Michael Meissner <meissner at gcc dot gnu.org> ---
Note, the fix proposed in PR64151 DOES NOT work on the PowerPC, so it may be a
dup in terms of what change broke the build, but the potential fix needs more
analysis.

[Bug target/64113] Gcc on Alpha: Error: No lda !gpdisp!282 was found

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64113

--- Comment #6 from uros at gcc dot gnu.org ---
Author: uros
Date: Sun Feb 22 15:29:16 2015
New Revision: 220896

URL: https://gcc.gnu.org/viewcvs?rev=220896&root=gcc&view=rev
Log:
    Backport from mainline
    2014-12-02  Uros Bizjak  <ubizjak@gmail.com>

    PR target/64113
    * config/alpha/alpha.md (call_value_osf_tlsgd): Do not split insn
    using post-reload splitter.  Use peephole2 pass instead.
    (call_value_osf_tlsldm): Ditto.
    (TLS_CALL): New int iterator.
    (tls): New int attribute.
    (call_value_osf_<tls>): Merge insn pattern from call_value_osf_tlsgd
    and call_value_tlsldm using TLS_CALL int iterator.


Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/config/alpha/alpha.md