[Bug c/105572] New: timeout with -march=bdver2

[Bug c/105572] New: timeout with -march=bdver2

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105572

            Bug ID: 105572
           Summary: timeout with -march=bdver2
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 52956
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52956&action=edit
C source code

For the attached C code, adding -march=bdver2 causes the compiler to 
spend a lot of time.

$ time /home/dcb/gcc/results/bin/gcc  -w -c -g -O3 bug810.c

real    0m3.344s
user    0m3.133s
sys     0m0.089s
$ (ulimit -t 300; time /home/dcb/gcc/results/bin/gcc  -w -c -g -O3
-march=bdver2  bug810.c)
gcc: fatal error: Killed signal terminated program as
compilation terminated.

real    5m20.276s
user    5m8.801s
sys     0m0.880s
$  /home/dcb/gcc/results/bin/gcc  -v 2>&1 | fgrep exp
gcc version 13.0.0 20220511 (experimental) (5b2a24ebfc0b2b4c) 
$

[Bug target/105572] timeout with -march=bdver2

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105572

--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
The problem seems to exist before git revision 82a4c5c704433249, dated about a
month ago.

[Bug target/105572] [12/13 Regression] timeout with -march=bdver2 since r12-155-gd8e1f1d24179690f

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105572

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marxin at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW
            Summary|timeout with -march=bdver2  |[12/13 Regression] timeout
                   |                            |with -march=bdver2 since
                   |                            |r12-155-gd8e1f1d24179690f
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-05-12

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r12-155-gd8e1f1d24179690f.

Apparently GAS takes ages in:
    81.66%  as             [.] symbol_clone_if_forward_ref.part.0

[Bug target/105572] [12/13 Regression] timeout with -march=bdver2 since r12-155-gd8e1f1d24179690f

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105572

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This should be reported to binutils and closed as moved since this is not a gcc
bug.

[Bug target/105572] [12/13 Regression] timeout with -march=bdver2 since r12-155-gd8e1f1d24179690f

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105572

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |12.2

[Bug target/105572] [12/13 Regression] timeout with -march=bdver2 since r12-155-gd8e1f1d24179690f

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105572

--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
I bisected that and it's fixed in master (not present in any release branch):

commit fb0e49d8e05e61ca2af9b5f60b01ad5fb6d274ff
Author: Alan Modra <amodra@gmail.com>
Date:   Tue Mar 8 22:48:51 2022 +1030

    Constant fold view increment expressions

    The idea here is to replace expressions like v + 1 + 1 + 1 with v + 3.

            * dwarf2dbg.c (set_or_check_view): Remove useless assertion.
            Resolve multiple view increments.
            * testsuite/gas/elf/dwarf2-18.d: Don't xfail mep.

[Bug target/105572] [12/13 Regression] timeout with -march=bdver2 since r12-155-gd8e1f1d24179690f

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105572

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

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

--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed in binutils master.