[Bug driver/46760] New: LTO doesn't work with FDO

[Bug driver/46760] New: LTO doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

           Summary: LTO doesn't work with FDO
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hjl.tools@gmail.com


When gcc is configured with --with-build-config=bootstrap-lto,
I got

make profiledbootstrap -j8
...
/tmp/ccFYqcB1.ltrans0.ltrans.o: In function `pex_unix_exec_child.3021':
/export/gnu/import/git/gcc/libiberty/pex-unix.c:669: undefined reference to
`__gcov_execvp'
/export/gnu/import/git/gcc/libiberty/pex-unix.c:674: undefined reference to
`__gcov_execv'
collect2: ld returned 1 exit status
make[4]: *** [lto-wrapper] Error 1
make[4]: *** Waiting for unfinished jobs....
rm cpp.pod gcov.pod gfdl.pod gcc.pod fsf-funding.pod
make[4]: Leaving directory `/export/build/gnu/gcc-lto/build-x86_64-linux/gcc'
make[3]: *** [all-stageprofile-gcc] Error 2
make[3]: Leaving directory `/export/build/gnu/gcc-lto/build-x86_64-linux'
make[2]: *** [stageprofile-bubble] Error 2
make[2]: Leaving directory `/export/build/gnu/gcc-lto/build-x86_64-linux'
make[1]: *** [profiledbootstrap] Error 2
make[1]: Leaving directory `/export/build/gnu/gcc-lto/build-x86_64-linux'
5005.95user 127.48system 12:19.47elapsed 694%CPU (0avgtext+0avgdata
1395712maxresident)k
109864inputs+6981752outputs (5major+52176484minor)pagefaults 0swaps
make: *** [profiledbootstrap] Error 2

[Bug driver/46760] LTO doesn't work with FDO

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2010-12-02 01:47:47 UTC ---
I think this is a bug in make file rather than anything else.  We are building
libibity with -fprofile-generate but not lto-wrapper.

[Bug driver/46760] LTO doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2010-12-02 01:58:17 UTC ---
(In reply to comment #1)
> I think this is a bug in make file rather than anything else.  We are building
> libibity with -fprofile-generate but not lto-wrapper.

It looks good to me:

/export/build/gnu/gcc-lto/build-x86_64-linux/./prev-gcc/xgcc
-B/export/build/gnu/gcc-lto/build-x86_64-linux/./prev-gcc/
-B/usr/gcc-4.6.0/x86_64-unknown-linux-gnu/bin/
-B/usr/gcc-4.6.0/x86_64-unknown-linux-gnu/bin/
-B/usr/gcc-4.6.0/x86_64-unknown-linux-gnu/lib/ -isystem
/usr/gcc-4.6.0/x86_64-unknown-linux-gnu/include -isystem
/usr/gcc-4.6.0/x86_64-unknown-linux-gnu/sys-include    -c -DHAVE_CONFIG_H -g
-O2 -flto=jobserver -fuse-linker-plugin -frandom-seed=1 -fprofile-generate  -I.
-I/export/gnu/import/git/gcc/libiberty/../include  -W -Wall -Wwrite-strings
-Wc++-compat -Wstrict-prototypes -pedantic 
/export/gnu/import/git/gcc/libiberty/pex-unix.c -o pex-unix.o

[Bug driver/46760] LTO doesn't work with FDO

[davek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

Dave Korn <davek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2010.12.02 04:57:41
         AssignedTo|unassigned at gcc dot       |davek at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

--- Comment #3 from Dave Korn <davek at gcc dot gnu.org> 2010-12-02 04:57:41 UTC ---
Created attachment 22600
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22600
extend pass-throughs

I'm testing this, which adds pass-thoughs for gcov and the endfiles (see also
Bug 42690).

[Bug driver/46760] LTO doesn't work with FDO

[davek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #4 from Dave Korn <davek at gcc dot gnu.org> 2010-12-02 07:14:34 UTC ---

  With my patch we no longer get the undefined symbols building lto-wrapper,
but instead later on we hit this problem:

------------------------------------------------------------------------------
       [ . . . ]
/home/davek/gcc/obj-gold/./prev-gcc/xgcc -B/home/davek/gcc/obj-gold/./prev-gcc/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/bin/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/bin/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/lib/ -isystem
/n/10/davek/gcc/x86_64-unknown-linux-gnu/include -isystem
/n/10/davek/gcc/x86_64-unknown-linux-gnu/sys-include      -g -O2
-flto=jobserver -fuse-linker-plugin -frandom-seed=1 -fprofile-use -DIN_GCC   -W
-Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
-Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -Werror -Wold-style-definition -Wc++-compat -fno-common
 -DHAVE_CONFIG_H -DGENERATOR_FILE  -o build/genchecksum \
        build/genchecksum.o .././libiberty/libiberty.a
lto1: sorry, unimplemented: combining units with different profiles is not
supported
lto1: internal compiler error: in lto_file_decl_data_get_fn_decl, at
lto-streamer.h:1075
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /home/davek/gcc/obj-gold/./prev-gcc/xgcc returned 1 exit status
gold: fatal error: lto-wrapper failed
collect2: ld returned 1 exit status
make[3]: *** [build/genchecksum] Error 1
make[3]: *** Waiting for unfinished jobs....
rm gfdl.pod cpp.pod gfortran.pod gcov.pod fsf-funding.pod gcc.pod
make[3]: Leaving directory `/home/davek/gcc/obj-gold/gcc'
make[2]: *** [all-stagefeedback-gcc] Error 2
make[2]: Leaving directory `/home/davek/gcc/obj-gold'
make[1]: *** [stagefeedback-bubble] Error 2
make[1]: Leaving directory `/home/davek/gcc/obj-gold'
make: *** [profiledbootstrap] Error 2
------------------------------------------------------------------------------

As far as I can see though, everything relevant was compiled with -fprofile-use
in effect:


------------------------------------------------------------------------------
Configuring stage feedback in ./libiberty
       [ . . . ]
/home/davek/gcc/obj-gold/./prev-gcc/xgcc -B/home/davek/gcc/obj-gold/./prev-gcc/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/bin/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/bin/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/lib/ -isystem
/n/10/davek/gcc/x86_64-unknown-linux-gnu/include -isystem
/n/10/davek/gcc/x86_64-unknown-linux-gnu/sys-include    -c -DHAVE_CONFIG_H -g
-O2 -flto=jobserver -fuse-linker-plugin -frandom-seed=1 -fprofile-use  -I.
-I/n/10/davek/gcc/gcc/libiberty/../include  -W -Wall -Wwrite-strings
-Wc++-compat -Wstrict-prototypes -pedantic  /n/10/davek/gcc/gcc/libiberty/md5.c
-o md5.o
       [ . . . ]
/home/davek/gcc/obj-gold/./prev-gcc/xgcc -B/home/davek/gcc/obj-gold/./prev-gcc/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/bin/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/bin/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/lib/ -isystem
/n/10/davek/gcc/x86_64-unknown-linux-gnu/include -isystem
/n/10/davek/gcc/x86_64-unknown-linux-gnu/sys-include    -c -DHAVE_CONFIG_H -g
-O2 -flto=jobserver -fuse-linker-plugin -frandom-seed=1 -fprofile-use  -I.
-I/n/10/davek/gcc/gcc/libiberty/../include  -W -Wall -Wwrite-strings
-Wc++-compat -Wstrict-prototypes -pedantic 
/n/10/davek/gcc/gcc/libiberty/fopen_unlocked.c -o fopen_unlocked.o
       [ . . . ]
/home/davek/gcc/obj-gold/./prev-gcc/xgcc -B/home/davek/gcc/obj-gold/./prev-gcc/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/bin/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/bin/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/lib/ -isystem
/n/10/davek/gcc/x86_64-unknown-linux-gnu/include -isystem
/n/10/davek/gcc/x86_64-unknown-linux-gnu/sys-include    -c -DHAVE_CONFIG_H -g
-O2 -flto=jobserver -fuse-linker-plugin -frandom-seed=1 -fprofile-use  -I.
-I/n/10/davek/gcc/gcc/libiberty/../include  -W -Wall -Wwrite-strings
-Wc++-compat -Wstrict-prototypes -pedantic 
/n/10/davek/gcc/gcc/libiberty/xstrerror.c -o xstrerror.o
       [ . . . ]
/home/davek/gcc/obj-gold/./prev-gcc/xgcc -B/home/davek/gcc/obj-gold/./prev-gcc/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/bin/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/bin/
-B/n/10/davek/gcc/x86_64-unknown-linux-gnu/lib/ -isystem
/n/10/davek/gcc/x86_64-unknown-linux-gnu/include -isystem
/n/10/davek/gcc/x86_64-unknown-linux-gnu/sys-include    -c   -g -O2
-flto=jobserver -fuse-linker-plugin -frandom-seed=1 -fprofile-use -DIN_GCC   -W
-Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
-Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -Werror -Wold-style-definition -Wc++-compat -fno-common
 -DHAVE_CONFIG_H -DGENERATOR_FILE -I. -Ibuild -I/n/10/davek/gcc/gcc/gcc
-I/n/10/davek/gcc/gcc/gcc/build -I/n/10/davek/gcc/gcc/gcc/../include
-I/n/10/davek/gcc/gcc/gcc/../libcpp/include -I/opt/cfarm/gmp-4.2.4/include
-I/opt/cfarm/mpfr-2.4.1/include -I/opt/cfarm/mpc-0.8/include 
-I/n/10/davek/gcc/gcc/gcc/../libdecnumber
-I/n/10/davek/gcc/gcc/gcc/../libdecnumber/bid -I../libdecnumber    \
        -o build/genchecksum.o /n/10/davek/gcc/gcc/gcc/genchecksum.c
       [ . . . ]
------------------------------------------------------------------------------

... but none the less input_profile_summary complains when it gets to the first
libiberty input IR object file.

Re: [Bug driver/46760] LTO doesn't work with FDO

[Jan Hubicka]

Hi,
at one point I tried profiledbootstrap and problem is that we can not merge multiple LTO files
that has been profiled different amount of times.  This happens during our build because lto1
and cc1 share libbackend.  We probably need to add code rescaling corresponding events...

Honza

[Bug driver/46760] LTO doesn't work with FDO

[davek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #5 from Dave Korn <davek at gcc dot gnu.org> 2010-12-02 07:47:13 UTC ---
(In reply to comment #4)

>  -DHAVE_CONFIG_H -DGENERATOR_FILE  -o build/genchecksum \
>         build/genchecksum.o .././libiberty/libiberty.a
> lto1: sorry, unimplemented: combining units with different profiles is not
> supported
> lto1: internal compiler error: in lto_file_decl_data_get_fn_decl, at
> lto-streamer.h:1075


  This sorry comes from input_profile_summary() in lto-cgraph.c, in fact:


static struct gcov_ctr_summary lto_gcov_summary;

/* Input profile_info from IB.  */
static void
input_profile_summary (struct lto_input_block *ib)
{
  unsigned int runs = lto_input_uleb128 (ib);
  if (runs)
    {
      if (!profile_info)
        {
      profile_info = &lto_gcov_summary;
      lto_gcov_summary.runs = runs;
      lto_gcov_summary.sum_all = lto_input_sleb128 (ib);
      lto_gcov_summary.run_max = lto_input_sleb128 (ib);
      lto_gcov_summary.sum_max = lto_input_sleb128 (ib);
    }
      /* We can support this by scaling all counts to nearest common multiple
         of all different runs, but it is perhaps not worth the effort.  */
      else if (profile_info->runs != runs
           || profile_info->sum_all != lto_input_sleb128 (ib)
           || profile_info->run_max != lto_input_sleb128 (ib)
           || profile_info->sum_max != lto_input_sleb128 (ib))
    sorry ("combining units with different profiles is not supported");
      /* We allow some units to have profile and other to not have one.  This
will
         just make unprofiled units to be size optimized that is sane.  */
    }

}

This is the start of the cgraph data from build/genchecksum.o:

(gdb) c
Continuing.

Breakpoint 5, lto_create_simple_input_block (file_data=0x7ffff7267000,
    section_type=LTO_section_cgraph, datar=0x7fffffffd858, len=0x7fffffffd860)
    at /n/10/davek/gcc/gcc/gcc/lto-section-in.c:294
294     {
$17 = {current_decl_state = 0x7ffff7275000,
  global_decl_state = 0x7ffff7275000, cgraph_node_encoder = 0x0,
  varpool_node_encoder = 0x0, function_decl_states = 0x7ffff735dcb0,
  file_name = 0x1bde940 "build/genchecksum.o", section_hash_table = 0x1bfa560,
  renaming_hash_table = 0x1bfb4a0, next = 0x0, id = 3807079657,
  resolutions = 0x1bfab30}
(gdb) fin
Run till exit from #0  lto_create_simple_input_block (
    file_data=0x7ffff7267000, section_type=LTO_section_cgraph,
    datar=0x7fffffffd858, len=0x7fffffffd860)
    at /n/10/davek/gcc/gcc/gcc/lto-section-in.c:294
input_cgraph () at /n/10/davek/gcc/gcc/gcc/lto-cgraph.c:1475
1475          if (!ib)
Value returned is $18 = (struct lto_input_block *) 0x1bfa250
(gdb) p $18[0]
$19 = {data = 0x1bfa020 "\004\201?\225\r??\237\003?\233\f\002\177", p = 0,
  len = 551}
(gdb) x/551xb $18->data
0x1bfa020:      0x04    0x81    0xf1    0x95    0x0d    0xc0    0xdc    0x9f
0x1bfa028:      0x03    0xda    0xb9    0x9b    0x0c    0x02    0x7f    0x00
0x1bfa030:      0x00    0x00    0x06    0x07    0x05    0x0f    0x7f    0x7f
0x1bfa038:      0xbc    0xa0    0x0a    0x00    0x00    0x02    0x7f    0x01
0x1bfa040:      0xbd    0x01    0xc8    0x20    0xe4    0x00    0x06    0xe2

and here is how it gets read into lto_gcov_summary first time
input_profile_summary is called:

(gdb) p &'lto_gcov_summary.170684.49820'
$27 = (<data variable, no debug info> *) 0x1777280
(gdb) p (struct gcov_ctr_summary *)&'lto_gcov_summary.170684.49820'
$28 = (struct gcov_ctr_summary *) 0x1777280
(gdb) p $28[0]
$29 = {num = 0, runs = 4, sum_all = 27621505, run_max = 6811200,
  sum_max = 25615578}
(gdb) p/x $28[0]
$30 = {num = 0x0, runs = 0x4, sum_all = 0x1a57881, run_max = 0x67ee40,
  sum_max = 0x186dcda}
(gdb)

But here's the start of the ../libiberty/md5.o cgraph section data:

(gdb) c
Continuing.

Breakpoint 5, lto_create_simple_input_block (file_data=0x7ffff72670b0,
    section_type=LTO_section_cgraph, datar=0x7fffffffd858, len=0x7fffffffd860)
    at /n/10/davek/gcc/gcc/gcc/lto-section-in.c:294
294     {
$22 = {current_decl_state = 0x7ffff7275870,
  global_decl_state = 0x7ffff7275870, cgraph_node_encoder = 0x0,
  varpool_node_encoder = 0x0, function_decl_states = 0x7ffff735dd20,
  file_name = 0x1bfb480 "../libiberty/md5.o", section_hash_table = 0x1bfcdd0,
  renaming_hash_table = 0x1bfae30, next = 0x0, id = 3807079657,
  resolutions = 0x1bfb770}
(gdb) fin
Run till exit from #0  lto_create_simple_input_block (
    file_data=0x7ffff72670b0, section_type=LTO_section_cgraph,
    datar=0x7fffffffd858, len=0x7fffffffd860)
    at /n/10/davek/gcc/gcc/gcc/lto-section-in.c:294
input_cgraph () at /n/10/davek/gcc/gcc/gcc/lto-cgraph.c:1475
1475          if (!ib)
Value returned is $23 = (struct lto_input_block *) 0x1bfbb50
(gdb) p $23[0]
$24 = {
  data = 0x1bfc0e0 "?\016??\212?\212\002\220?\204\017??\204?\002\002\177",
  p = 0, len = 352}
(gdb) x/352xb $23->data
0x1bfc0e0:      0xc0    0x0e    0xaf    0xbc    0x8a    0xed    0x8a    0x02
0x1bfc0e8:      0x90    0xcf    0x84    0x0f    0xa3    0xa1    0x84    0xb4
0x1bfc0f0:      0x02    0x02    0x7f    0x00    0x08    0x00    0x0b    0x09
0x1bfc0f8:      0x0a    0x11    0x7f    0x7f    0x9e    0xa0    0x0a    0x00
0x1bfc100:      0x00    0x02    0x7f    0x01    0x00    0x00    0x0b    0x0b
0x1bfc108:      0x0a    0x13    0x7f    0x7f    0x9e    0xa0    0x0a    0x00

which gives me { runs = 0x740, sum_all = 0x10ada29e2f, run_max = 0x1e12790,
sum_max = 0x268110a3 }, none of which remotely matches up with the gcov summary
from genchecksum.o

[Bug driver/46760] LTO doesn't work with FDO

[hubicka at ucw dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #6 from Jan Hubicka <hubicka at ucw dot cz> 2010-12-02 09:00:51 UTC ---
Hi,
at one point I tried profiledbootstrap and problem is that we can not merge
multiple LTO files
that has been profiled different amount of times.  This happens during our
build because lto1
and cc1 share libbackend.  We probably need to add code rescaling corresponding
events...

Honza

[Bug driver/46760] LTO doesn't work with FDO

[davek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

Dave Korn <davek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |42690
         AssignedTo|davek at gcc dot gnu.org    |unassigned at gcc dot
                   |                            |gnu.org

--- Comment #7 from Dave Korn <davek at gcc dot gnu.org> 2010-12-02 09:08:42 UTC ---
(In reply to comment #6)
> Hi,
> at one point I tried profiledbootstrap and problem is that we can not merge
> multiple LTO files
> that has been profiled different amount of times.  This happens during our
> build because lto1
> and cc1 share libbackend.  We probably need to add code rescaling corresponding
> events...
> 
> Honza

  Rather than open a second bug for this part of the problem, let's leave this
PR to handle it; the first part of the problem that HJ originally reported can
be considered a part of bug 42690, which I'm in the course of testing the
attached patch as part of.

  So, de-assigning myself from this PR.  Possibly we should consider this a
build system bug and the makefile should be responsible for swapping sets of
gcda files in and out?  Otherwise the component should be changed to lto.

Re: [Bug driver/46760] LTO doesn't work with FDO

[Jan Hubicka]

Hi,
you can still test bootstrap with simply commenting out that sorry.  It should give, sort-of, sane results.
I will implement counter rescaling once I get some time for it - it is not too hard.
Also not too many setups actually train library built into multiple binaries, so it is not that critical
outside GCC itself.

[Bug driver/46760] LTO doesn't work with FDO

[hubicka at ucw dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #8 from Jan Hubicka <hubicka at ucw dot cz> 2010-12-02 09:22:38 UTC ---
Hi,
you can still test bootstrap with simply commenting out that sorry.  It should
give, sort-of, sane results.
I will implement counter rescaling once I get some time for it - it is not too
hard.
Also not too many setups actually train library built into multiple binaries,
so it is not that critical
outside GCC itself.

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #9 from Jan Hubicka <hubicka at gcc dot gnu.org> 2010-12-02 15:57:00 UTC ---
Created attachment 22604
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22604
Patch I am testing to allow profile merging

This patch should allow merging of LTO units with different number of
executions.  I am testing how far I can get with lto bootstrap with this one
and the pass-through

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> 2010-12-04 17:04:34 UTC ---
(In reply to comment #9)
> Created attachment 22604 [details]
> Patch I am testing to allow profile merging
> 
> This patch should allow merging of LTO units with different number of
> executions.  I am testing how far I can get with lto bootstrap with this one
> and the pass-through

I got

lto1: internal compiler error: Floating point exception
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Do we have a divide by zero bug?

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #11 from H.J. Lu <hjl.tools at gmail dot com> 2010-12-04 17:13:57 UTC ---
Program received signal SIGFPE, Arithmetic exception.
0x0000000000f6e670 in merge_profile_summaries ()
    at /export/gnu/import/git/gcc/gcc/lto-cgraph.c:1513
1513            / node->local.lto_file_data->profile_info.run_max);

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #12 from H.J. Lu <hjl.tools at gmail dot com> 2010-12-04 17:24:28 UTC ---
(gdb) p cgraph_nodes->local.lto_file_data->profile_info
$4 = {num = 0, runs = 9409, sum_all = 0, run_max = 0, sum_max = 1302797449}
(gdb)

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

Jan Hubicka <hubicka at gcc dot gnu.org> changed:

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

--- Comment #13 from Jan Hubicka <hubicka at gcc dot gnu.org> 2010-12-04 17:33:02 UTC ---
I fixed that division bug (it is wrong way) and I can bootstrap C only, C++
still fails, this time on profile mismatches.
I will commit the fixed patch.

Honza

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #14 from Jan Hubicka <hubicka at gcc dot gnu.org> 2010-12-04 19:35:27 UTC ---
Author: hubicka
Date: Sat Dec  4 19:35:23 2010
New Revision: 167458

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=167458
Log:

    PR tree-optimization/46760
    * cgraph.c (cgraph_create_node): Initialize count_materialization_scale.
    * cgraph.h (struct cgraph_node): Add count_materialization_scale.
    * lto-cgraph.c (lto_output_edge): Fix assert.
    (lto_output_node): Output count_materialization_scale.
    (output_profile_summary): Output only runs and sum_max.
    (input_node): Input count_materialization_scale.
    (input_profile_summary): Read data into file specific gcov summary.
    (merge_profile_summaries): New function.
    (input_cgraph): Update call of input_profile_summary;
    call merge_profile_summaries.
    * lto-streamer-in.c (input_cfg): Add count_materialization_scale arg;
    rescale counts at read in.
    (intput_bb): Likewise.
    (input_function): Update call of input_bb.
    (lto_read_body): Update call of input_cfg.
    * lto-streamer.h: Inlclude gcov-io.h
    (lto_file_decl_data): Add gcov_ctr_summary.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cgraph.c
    trunk/gcc/cgraph.h
    trunk/gcc/lto-cgraph.c
    trunk/gcc/lto-streamer-in.c
    trunk/gcc/lto-streamer.h

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #15 from H.J. Lu <hjl.tools at gmail dot com> 2010-12-05 00:51:39 UTC ---
With revision 167460, I got

[hjl@gnu-18 gcc]$ /export/build/gnu/gcc-lto/build-x86_64-linux/./prev-gcc/xgcc
-B/export/build/gnu/gcc-lto/build-x86_64-linux/./prev-gcc/
-B/usr/gcc-4.6.0/x86_64-unknown-linux-gnu/bin/
-B/usr/gcc-4.6.0/x86_64-unknown-linux-gnu/bin/
-B/usr/gcc-4.6.0/x86_64-unknown-linux-gnu/lib/ -isystem
/usr/gcc-4.6.0/x86_64-unknown-linux-gnu/include -isystem
/usr/gcc-4.6.0/x86_64-unknown-linux-gnu/sys-include      -g -O2 -flto=jobserver
-fuse-linker-plugin -frandom-seed=1 -fprofile-use -DIN_GCC   -W -Wall
-Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
-Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -Werror -Wold-style-definition -Wc++-compat -fno-common
 -DHAVE_CONFIG_H -DGENERATOR_FILE -static-libstdc++ -static-libgcc  -o
build/genchecksum build/genchecksum.o .././libiberty/libiberty.a
In function \u2018md5_process_block\u2019:
lto1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make: *** [/tmp/cc1Nc0QJ.ltrans0.ltrans.o] Error 1
lto-wrapper: make returned 2 exit status
lto-wrapper failedcollect2: ld returned 1 exit status
[hjl@gnu-18 gcc]$

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

Jan Hubicka <hubicka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |WAITING

--- Comment #16 from Jan Hubicka <hubicka at gcc dot gnu.org> 2010-12-05 14:28:29 UTC ---
Bootstrap works for me with current mainline with release checking as well as
default checking, configured as:

../configure --enable-stage1-languages=c,lto
--with-ld=/abuild/jh/trunk-install/bin/ld --with-build-config=bootstrap-lto
--enable-checking=release --disable-plugin

Can you, please, re-confirm the bug or close the PR?

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW

--- Comment #17 from H.J. Lu <hjl.tools at gmail dot com> 2010-12-05 17:16:53 UTC ---
(In reply to comment #16)
> Bootstrap works for me with current mainline with release checking as well as
> default checking, configured as:
> 
> ../configure --enable-stage1-languages=c,lto
> --with-ld=/abuild/jh/trunk-install/bin/ld --with-build-config=bootstrap-lto
> --enable-checking=release --disable-plugin
                            ^^^^^^^^^^^^^^^^^
Can you try without disabling plugin?

I am using.

--enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --enable-langua
ges=c,lto  --prefix=/usr/gcc-4.6.0 --with-local-prefix=/usr/local
--with-fpmath=
sse --with-build-config=bootstrap-lto

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #18 from Jan Hubicka <hubicka at gcc dot gnu.org> 2010-12-05 19:04:38 UTC ---
I tried with the default checking earlier (this is not LTO plugin, just the
plugin support that does not cause that much of difference).  I will try
tonight or after I return from trip.

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

Jan Hubicka <hubicka at gcc dot gnu.org> changed:

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

--- Comment #19 from Jan Hubicka <hubicka at gcc dot gnu.org> 2011-01-09 18:27:52 UTC ---
it works for me now.

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

H.J. Lu <hjl.tools at gmail dot com> changed:

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

--- Comment #20 from H.J. Lu <hjl.tools at gmail dot com> 2011-01-09 22:02:10 UTC ---
On my Intel64 machine with 6GB RAM and 12GB swap, revision 168617
failed at final link:

lto1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /export/build/gnu/gcc-lto/build-x86_64-linux/./prev-gcc/xgcc
returned 1 exit status
/usr/local/bin/ld: lto-wrapper failed
collect2: ld returned 1 exit status
make[5]: *** [lto1] Error 1
make[5]: *** Waiting for unfinished jobs....
lto1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /export/build/gnu/gcc-lto/build-x86_64-linux/./prev-gcc/xgcc
returned 1 exit status
/usr/local/bin/ld: lto-wrapper failed
collect2: ld returned 1 exit status
make[5]: *** [cc1obj] Error 1
lto1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /export/build/gnu/gcc-lto/build-x86_64-linux/./prev-gcc/xgcc
returned 1 exit status
/usr/local/bin/ld: lto-wrapper failed
collect2: ld returned 1 exit status
make[5]: *** [jc1] Error 1
lto1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /export/build/gnu/gcc-lto/build-x86_64-linux/./prev-gcc/xgcc
returned 1 exit status
/usr/local/bin/ld: lto-wrapper failed
collect2: ld returned 1 exit status
make[5]: *** [cc1] Error 1
lto1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /export/build/gnu/gcc-lto/build-x86_64-linux/./prev-gcc/xgcc
returned 1 exit status
/usr/local/bin/ld: lto-wrapper failed
collect2: ld returned 1 exit status
make[5]: *** [cc1plus] Error 1
lto1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /export/build/gnu/gcc-lto/build-x86_64-linux/./prev-gcc/xgcc
returned 1 exit status
/usr/local/bin/ld: lto-wrapper failed
collect2: ld returned 1 exit status
make[5]: *** [f951] Error 1
rm gcj-dbtool.pod jcf-dump.pod cpp.pod jv-convert.pod grmic.pod gcov.pod
gcj.pod gc-analyze.pod gfdl.pod gij.pod gcc.pod gfortran.pod fsf-funding.pod
make[5]: Leaving directory `/export/build/gnu/gcc-lto/build-x86_64-linux/gcc'
make[4]: *** [all-stagefeedback-gcc] Error 2
make[4]: Leaving directory `/export/build/gnu/gcc-lto/build-x86_64-linux'
make[3]: *** [stagefeedback-bubble] Error 2
make[3]: Leaving directory `/export/build/gnu/gcc-lto/build-x86_64-linux'
make[2]: *** [profiledbootstrap] Error 2
make[2]: Leaving directory `/export/build/gnu/gcc-lto/build-x86_64-linux'

GCC configured with

/export/gnu/import/git/gcc/configure --enable-clocale=gnu --with-system-zlib
--with-demangler-in-ld   --prefix=/usr/gcc-4.6.0 --with-local-prefix=/usr/local
--with-fpmath=sse --with-build-config=bootstrap-lto

Re: [Bug driver/46760] LTO bootstrap doesn't work with FDO

[Jan Hubicka]

> lto1: internal compiler error: Segmentation fault
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <http://gcc.gnu.org/bugs.html> for instructions.
> lto-wrapper: /export/build/gnu/gcc-lto/build-x86_64-linux/./prev-gcc/xgcc

What is the backtrace here?  I built working profiledbootsrap LTO compiler with various cofigurations
already (both GNU ld and gold) w/o problems....  I will try with current tree.

Honza

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hubicka at ucw dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #21 from Jan Hubicka <hubicka at ucw dot cz> 2011-01-09 22:07:59 UTC ---
> lto1: internal compiler error: Segmentation fault
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <http://gcc.gnu.org/bugs.html> for instructions.
> lto-wrapper: /export/build/gnu/gcc-lto/build-x86_64-linux/./prev-gcc/xgcc

What is the backtrace here?  I built working profiledbootsrap LTO compiler with
various cofigurations
already (both GNU ld and gold) w/o problems....  I will try with current tree.

Honza

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #22 from H.J. Lu <hjl.tools at gmail dot com> 2011-01-10 00:01:45 UTC ---
Program received signal SIGSEGV, Segmentation fault.
tree_can_inline_p (e=0x7fffdaf9fd68)
    at /export/gnu/import/git/gcc/gcc/tree-inline.c:5391
5391          gimple_call_set_cannot_inline (e->call_stmt, true);
Missing separate debuginfos, use: debuginfo-install
cloog-ppl-0.15.8-1.0.f12.x86_64 glibc-2.12.90-21.2.f14.x86_64
gmp-4.3.2-0.0.f13.x86_64 libgcc-4.5.1-4.fc14.x86_64 libmpc-0.8.1-1.0.f12.x86_64
libstdc++-4.5.1-4.fc14.x86_64 mpfr-2.4.2-1.0.f12.x86_64
ppl-0.10.2-10.fc12.x86_64 zlib-1.2.5-2.fc14.x86_64
(gdb) bt
#0  tree_can_inline_p (e=0x7fffdaf9fd68)
    at /export/gnu/import/git/gcc/gcc/tree-inline.c:5391
#1  0x0000000000a5653a in cgraph_decide_inlining_of_small_functions ()
    at /export/gnu/import/git/gcc/gcc/ipa-inline.c:1177
#2  0x0000000000a585b7 in cgraph_decide_inlining ()
    at /export/gnu/import/git/gcc/gcc/ipa-inline.c:1479
#3  0x0000000000e65b52 in execute_one_pass (pass=0x1947960)
    at /export/gnu/import/git/gcc/gcc/passes.c:1553
#4  0x0000000000e6626a in execute_ipa_pass_list (pass=0x1947960)
    at /export/gnu/import/git/gcc/gcc/passes.c:1920
#5  0x0000000000e665e6 in do_whole_program_analysis ()
    at /export/gnu/import/git/gcc/gcc/lto/lto.c:2334
#6  0x0000000000ebab88 in lto_main ()
    at /export/gnu/import/git/gcc/gcc/lto/lto.c:2446
#7  0x000000000071730d in compile_file ()
    at /export/gnu/import/git/gcc/gcc/toplev.c:579
#8  do_compile () at /export/gnu/import/git/gcc/gcc/toplev.c:1874
#9  0x00000000007189e5 in toplev_main (argc=405, argv=0x1e44a00)
    at /export/gnu/import/git/gcc/gcc/toplev.c:1937
#10 0x00000000004a5040 in main (argc=35, argv=0x7fffffffdc08)
    at /export/gnu/import/git/gcc/gcc/main.c:36
(gdb) list
5386    
5387      /* Allow the backend to decide if inlining is ok.  */
5388      if (!targetm.target_option.can_inline_p (caller, callee))
5389        {
5390          e->inline_failed = CIF_TARGET_OPTION_MISMATCH;
5391          gimple_call_set_cannot_inline (e->call_stmt, true);
5392          e->call_stmt_cannot_inline_p = true;
5393          return false;
5394        }
5395    
(gdb) p e
$1 = (struct cgraph_edge *) 0x7fffdaf9fd68
(gdb) p e->call_stmt
$2 = (union gimple_statement_d *) 0x0
(gdb)

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hubicka at ucw dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #23 from Jan Hubicka <hubicka at ucw dot cz> 2011-01-10 00:21:35 UTC ---
> 5386    
> 5387      /* Allow the backend to decide if inlining is ok.  */
> 5388      if (!targetm.target_option.can_inline_p (caller, callee))
> 5389        {
> 5390          e->inline_failed = CIF_TARGET_OPTION_MISMATCH;
> 5391          gimple_call_set_cannot_inline (e->call_stmt, true);
> 5392          e->call_stmt_cannot_inline_p = true;
> 5393          return false;
> 5394        }
> 5395    
> (gdb) p e
> $1 = (struct cgraph_edge *) 0x7fffdaf9fd68
> (gdb) p e->call_stmt
> $2 = (union gimple_statement_d *) 0x0
> (gdb)
Obviously we can not set gimple_call_set_cannot_inline when call_stmt is
missing.
I guess just guardining the set with
if (e->call_stmt)
  gimple_call_set_cannot_inline (e->call_stmt, true);
in all occurences in the function should fix the issue. Consider it preaproved
if it helps.  In 4.7 we probably should drop the gimple_call_set_cannot_inline
calls completely, I don't see any value in them.

Can you do dump_cgraph_node (stderr, e->caller) and dump_cgraph_node (stderr,
e->callee)??  I think we should decide function to be uninlinable only in
presence of target optimization attributes and I can not think of any during
the bootstrap....

Honza

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #24 from H.J. Lu <hjl.tools at gmail dot com> 2011-01-10 01:24:13 UTC ---
(gdb) call dump_cgraph_node (stderr, e->caller)
_cpp_clean_line/47583(-1) @0x7fffdaf97b00 (asm: _cpp_clean_line)
availability:available analyzed executed 136036096x 107 time, 14 benefit 186
size, 7 benefit (204 after inlining) needed reachable externally_visible
prevailing_def finalized inlinable
  called by: cpp_pop_definition/47256 (1.00 per call) destringize_and_run/47257
(1.00 per call) run_directive/47259 (2130530x) (1.00 per call)
builtin_macro/47693 (97x) (1.00 per call) paste_tokens/47699 (450825x) (1.00
per call) cpp_read_state/47816 (1.00 per call) _cpp_skip_block_comment/47586
(19682217x) (0.93 per call) _cpp_get_fresh_line.part.5/47584 (113774079x) (1.00
per call) 
  calls: add_line_note/38510 (inlined) (136036096x) (1.00 per call)
add_line_note/47567 (nested in 1 loops) add_line_note/47567 (8317015x) (0.06
per call) (nested in 1 loops) add_line_note/47567 (2018574x) (0.01 per call)
__builtin_expect/2426 (133456296x) (0.98 per call) __builtin_expect/2426
(133456296x) (0.98 per call) __builtin_expect/2426 (133456296x) (0.98 per call)
add_line_note/47567 (nested in 1 loops) __builtin_expect/2426 (319549x) (0.00
per call) (nested in 1 loops) __builtin_expect/2426 (133775845x) (0.98 per
call) (nested in 1 loops) search_line_sse42/47576 (136174844x) (1.00 per call)
(nested in 1 loops) 
  References:  var:search_line_fast (read) fn:search_line_sse42/47576 (addr)
var:_cpp_trigraph_map (read) var:_cpp_trigraph_map (read) var:_sch_istable
(read) var:_sch_istable (read) var:_cpp_trigraph_map (read)
var:_cpp_trigraph_map (read)
  Refering this function: 
  has 1 outgoing edges for indirect calls.
(gdb) call dump_cgraph_node (stderr, e->callee)
search_line_sse42/47576(-1) @0x7fffdaf97160 (asm: search_line_sse42.762190)
availability:available analyzed executed 136174844x 18 time, 15 benefit 30
size, 7 benefit address_taken prevailing_def_ironly finalized inlinable
  called by: _cpp_clean_line/47583 (136174844x) (1.00 per call) 
  calls: __builtin_expect/2426 (127407932x) (0.94 per call)
search_line_sse2/47575 (1039x) __builtin_expect/2426 (142096x) (0.00 per call)
__builtin_expect/2426 (127408971x) (0.94 per call) 
  References: 
  Refering this function:  fn:init_vectorized_lexer/47582 (addr)
fn:_cpp_clean_line/47583 (addr)
(gdb)

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #25 from H.J. Lu <hjl.tools at gmail dot com> 2011-01-10 01:25:00 UTC ---
My machine supports SSE4.

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hubicka at ucw dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #26 from Jan Hubicka <hubicka at ucw dot cz> 2011-01-10 01:42:06 UTC ---
> call) (nested in 1 loops) search_line_sse42/47576 (136174844x) (1.00 per call)
Ahh, that is the Andi's vectorized preprocessor code. That is fine then....

Honza

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #27 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> 2011-01-10 13:24:30 UTC ---
Author: hjl
Date: Mon Jan 10 13:24:27 2011
New Revision: 168631

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=168631
Log:
Check e->call_stmt before calling gimple_call_set_cannot_inline.

2011-01-10  H.J. Lu  <hongjiu.lu@intel.com>

    PR lto/46760
    * tree-inline.c (tree_can_inline_p): Check e->call_stmt before
    calling gimple_call_set_cannot_inline.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-inline.c

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.6.0

--- Comment #28 from H.J. Lu <hjl.tools at gmail dot com> 2011-01-10 13:27:11 UTC ---
Fixed.

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hubicka at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #29 from Jan Hubicka <hubicka at gcc dot gnu.org> 2011-01-10 13:44:00 UTC ---
H.J., since you run regular testing, do you think you could switch one of
tester into lto-bootstrap (or ideally lto-bootstrap with FDO) so we keep those
in good condition?
Thanks!
Honza

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #30 from H.J. Lu <hjl.tools at gmail dot com> 2011-01-10 13:48:27 UTC ---
(In reply to comment #29)
> H.J., since you run regular testing, do you think you could switch one of
> tester into lto-bootstrap (or ideally lto-bootstrap with FDO) so we keep those
> in good condition?
> Thanks!

I have been testing lto-bootstrap:

http://gcc.gnu.org/ml/gcc-testresults/2011-01/msg00750.html

I will try to start lto-bootstrap with FDO.

Re: [Bug driver/46760] LTO bootstrap doesn't work with FDO

[Jan Hubicka]

> I have been testing lto-bootstrap:
> 
> http://gcc.gnu.org/ml/gcc-testresults/2011-01/msg00750.html
> 
> I will try to start lto-bootstrap with FDO.
Great, thanks!
The FDO bootstrap always suffered from lack of testing, so this should help.
Honza

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hubicka at ucw dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #31 from Jan Hubicka <hubicka at ucw dot cz> 2011-01-10 13:51:02 UTC ---
> I have been testing lto-bootstrap:
> 
> http://gcc.gnu.org/ml/gcc-testresults/2011-01/msg00750.html
> 
> I will try to start lto-bootstrap with FDO.
Great, thanks!
The FDO bootstrap always suffered from lack of testing, so this should help.
Honza

[Bug driver/46760] LTO bootstrap doesn't work with FDO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46760

--- Comment #32 from H.J. Lu <hjl.tools at gmail dot com> 2011-01-10 13:59:32 UTC ---
(In reply to comment #31)
> > I have been testing lto-bootstrap:
> > 
> > http://gcc.gnu.org/ml/gcc-testresults/2011-01/msg00750.html
> > 
> > I will try to start lto-bootstrap with FDO.
> Great, thanks!
> The FDO bootstrap always suffered from lack of testing, so this should help.
> Honza

I have been testing FDO bootstrap:

http://gcc.gnu.org/ml/gcc-testresults/2011-01/msg00765.html

I just need to start lto-bootstrap with FDO.