[Bug rtl-optimization/61278] ICE with LTO (lto-wrapper failed) on x86_64-linux-gnu in 64-bit mode

[Bug rtl-optimization/61278] ICE with LTO (lto-wrapper failed) on x86_64-linux-gnu in 64-bit mode

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61278

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |zhenqiang.chen at linaro dot org
          Component|lto                         |rtl-optimization

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Likely not LTO related.

[Bug rtl-optimization/61278] ICE with LTO (lto-wrapper failed) on x86_64-linux-gnu in 64-bit mode

[zhenqiang.chen at linaro dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61278

--- Comment #2 from zhenqiang.chen at linaro dot org ---
Confirmed.

df_live is not init in O1. Patch is in testing.

[Bug rtl-optimization/61278] ICE with LTO (lto-wrapper failed) on x86_64-linux-gnu in 64-bit mode

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61278

--- Comment #3 from Zhendong Su <su at cs dot ucdavis.edu> ---
Here is another (somewhat simpler) test case that points to the same issue: 

$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.10.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 4.10.0 20140524 (experimental) [trunk revision 210885] (GCC) 
$ 
$ gcc-trunk -O1 -c small.c
small.c: In function ‘fn2’:
small.c:20:1: internal compiler error: Segmentation fault
 }
 ^
0x989def crash_signal
    ../../gcc-trunk/gcc/toplev.c:337
0x5d4fa0 bitmap_clear
    ../../gcc-trunk/gcc/bitmap.c:311
0x5d4fa0 bitmap_copy(bitmap_head*, bitmap_head const*)
    ../../gcc-trunk/gcc/bitmap.c:534
0x961bf7 move_insn_for_shrink_wrap
    ../../gcc-trunk/gcc/shrink-wrap.c:209
0x961bf7 prepare_shrink_wrap(basic_block_def*)
    ../../gcc-trunk/gcc/shrink-wrap.c:337
0x961feb try_shrink_wrapping(edge_def**, edge_def*, bitmap_head*, rtx_def*)
    ../../gcc-trunk/gcc/shrink-wrap.c:463
0x78bbf1 thread_prologue_and_epilogue_insns
    ../../gcc-trunk/gcc/function.c:5661
0x78bbf1 rest_of_handle_thread_prologue_and_epilogue
    ../../gcc-trunk/gcc/function.c:6213
0x78bbf1 execute
    ../../gcc-trunk/gcc/function.c:6252
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$ 


-------------------------------


int a, b, c, *d, e, f, g, h;

int
fn1 ()
{
  return a - b;
}

int *
fn2 (int *p)
{
  h = c;
  for (e = 0; e == 0; e = fn1 () + 1)
    for (; f; f++)
      if (c)
    g = 0;
      else
    return d = p;
  return 0;
}
>From gcc-bugs-return-452448-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat May 24 21:47:50 2014
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Subject: [Bug lto/45375] [meta-bug] Issues with building Mozilla with LTO
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idE375

--- Comment #211 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Elfhack is rather sensitive to LTO, but it works for me, so this seems like
binutils issue or some elfhack change that happened recently.
I wrote instructions for building firefox with LTO here
http://hubicka.blogspot.ca/2014/04/linktime-optimization-in-gcc-2-firefox.html

Here I am attaching -ftime-report after the symtab hashtable was removed
Execution times (seconds)
 phase setup             :   0.01 ( 0%) usr   0.00 ( 0%) sys   0.02 ( 0%) wall
  1536 kB ( 0%) ggc
 phase opt and generate  :  54.29 (58%) usr   1.28 (18%) sys  55.58 (50%) wall
720779 kB (18%) ggc
 phase stream in         :  33.54 (36%) usr   1.84 (26%) sys  35.39 (32%) wall
3389310 kB (82%) ggc
 phase stream out        :   6.00 ( 6%) usr   4.02 (56%) sys  19.99 (18%) wall
     0 kB ( 0%) ggc
 garbage collection      :   1.86 ( 2%) usr   0.00 ( 0%) sys   1.86 ( 2%) wall
     0 kB ( 0%) ggc
 callgraph optimization  :   0.23 ( 0%) usr   0.00 ( 0%) sys   0.24 ( 0%) wall
     9 kB ( 0%) ggc
 ipa dead code removal   :   5.70 ( 6%) usr   0.18 ( 3%) sys   6.15 ( 6%) wall
    92 kB ( 0%) ggc
 ipa inheritance graph   :   0.09 ( 0%) usr   0.00 ( 0%) sys   0.09 ( 0%) wall
   883 kB ( 0%) ggc
 ipa virtual call target :   5.58 ( 6%) usr   0.06 ( 1%) sys   5.32 ( 5%) wall
     0 kB ( 0%) ggc
 ipa devirtualization    :   0.13 ( 0%) usr   0.00 ( 0%) sys   0.20 ( 0%) wall
  9201 kB ( 0%) ggc
 ipa cp                  :   2.34 ( 2%) usr   0.21 ( 3%) sys   2.55 ( 2%) wall
223628 kB ( 5%) ggc
 ipa inlining heuristics :  26.97 (29%) usr   0.67 ( 9%) sys  27.66 (25%) wall
865791 kB (21%) ggc
 ipa comdats             :   0.21 ( 0%) usr   0.00 ( 0%) sys   0.21 ( 0%) wall
     0 kB ( 0%) ggc
 ipa lto gimple in       :   0.07 ( 0%) usr   0.11 ( 2%) sys   0.21 ( 0%) wall
     0 kB ( 0%) ggc
 ipa lto gimple out      :   0.46 ( 0%) usr   0.19 ( 3%) sys   0.65 ( 1%) wall
     0 kB ( 0%) ggc
 ipa lto decl in         :  24.76 (26%) usr   1.28 (18%) sys  26.08 (23%) wall
2571773 kB (63%) ggc
 ipa lto decl out        :   5.45 ( 6%) usr   0.28 ( 4%) sys   5.75 ( 5%) wall
     0 kB ( 0%) ggc
 ipa lto cgraph I/O      :   1.13 ( 1%) usr   0.24 ( 3%) sys   1.38 ( 1%) wall
414551 kB (10%) ggc
 ipa lto decl merge      :   2.57 ( 3%) usr   0.01 ( 0%) sys   2.58 ( 2%) wall
  8227 kB ( 0%) ggc
 ipa lto cgraph merge    :   1.72 ( 2%) usr   0.00 ( 0%) sys   1.72 ( 2%) wall
 12166 kB ( 0%) ggc
 whopr wpa               :   1.04 ( 1%) usr   0.00 ( 0%) sys   1.04 ( 1%) wall
     2 kB ( 0%) ggc
 whopr wpa I/O           :   0.03 ( 0%) usr   3.55 (50%) sys  13.51 (12%) wall
     0 kB ( 0%) ggc
 whopr partitioning      :   4.97 ( 5%) usr   0.06 ( 1%) sys   5.02 ( 5%) wall
  3738 kB ( 0%) ggc
 ipa reference           :   3.62 ( 4%) usr   0.12 ( 2%) sys   3.75 ( 3%) wall
     0 kB ( 0%) ggc
 ipa profile             :   0.33 ( 0%) usr   0.01 ( 0%) sys   0.33 ( 0%) wall
     0 kB ( 0%) ggc
 ipa pure const          :   3.86 ( 4%) usr   0.01 ( 0%) sys   3.88 ( 3%) wall
     0 kB ( 0%) ggc
 tree eh                 :   0.00 ( 0%) usr   0.00 ( 0%) sys   0.01 ( 0%) wall
     0 kB ( 0%) ggc
 tree CFG cleanup        :   0.01 ( 0%) usr   0.00 ( 0%) sys   0.00 ( 0%) wall
     0 kB ( 0%) ggc
 varconst                :   0.05 ( 0%) usr   0.16 ( 2%) sys   0.13 ( 0%) wall
     0 kB ( 0%) ggc
 unaccounted todo        :   0.65 ( 1%) usr   0.00 ( 0%) sys   0.64 ( 1%) wall
     0 kB ( 0%) ggc
 TOTAL                 :  93.84             7.14           110.98
4111626 kB

there are some improvements in devirtualization performance that used quite few
decl->symbol lookups. (about 20%)

[Bug rtl-optimization/61278] ICE with LTO (lto-wrapper failed) on x86_64-linux-gnu in 64-bit mode

[zqchen at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61278

--- Comment #4 from zqchen at gcc dot gnu.org ---
Author: zqchen
Date: Mon May 26 06:40:57 2014
New Revision: 210922

URL: http://gcc.gnu.org/viewcvs?rev=210922&root=gcc&view=rev
Log:
ChangeLog:
2014-05-26  Zhenqiang Chen  <zhenqiang.chen@linaro.org>

    PR rtl-optimization/61278
    * shrink-wrap.c (move_insn_for_shrink_wrap): Check df_live.

testsuite/ChangeLog:
2014-05-26  Zhenqiang Chen  <zhenqiang.chen@linaro.org>

    * gcc.dg/lto/pr61278_0.c: New test.
    * gcc.dg/lto/pr61278_1.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/lto/pr61278_0.c
    trunk/gcc/testsuite/gcc.dg/lto/pr61278_1.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/shrink-wrap.c
    trunk/gcc/testsuite/ChangeLog