[Bug bootstrap/65337] New: 5.0 bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[Bug bootstrap/65337] New: 5.0 bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[nheghathivhistha at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

            Bug ID: 65337
           Summary: 5.0 bootstrap-lto gnat1 linktime ICE:
                    gcc/ada/exp_aggr.adb:6570:0: internal compiler error:
                    in forward_edge_to_pdom, at tree-ssa-dce.c:1086
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: nheghathivhistha at gmail dot com

/var/tmp/portage/sys-devel/gcc-4.10.0_pre20150305/work/build/./prev-gcc/xg++
-B/var/tmp/portage/sys-devel/gcc-4.10.0_pre20150305/work/build/./prev-gcc/
-B/usr/x86_64-pc-linux-gnu/bin/ -nostdinc++
-B/var/tmp/portage/sys-devel/gcc-4.10.0_pre20150305/work/build/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-B/var/tmp/portage/sys-devel/gcc-4.10.0_pre20150305/work/build/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
 -isystem
/var/tmp/portage/sys-devel/gcc-4.10.0_pre20150305/work/build/prev-x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu
 -isystem
/var/tmp/portage/sys-devel/gcc-4.10.0_pre20150305/work/build/prev-x86_64-pc-linux-gnu/libstdc++-v3/include
 -isystem
/var/tmp/portage/sys-devel/gcc-4.10.0_pre20150305/work/gcc-4.10.0-20150305/libstdc++-v3/libsupc++
-L/var/tmp/portage/sys-devel/gcc-4.10.0_pre20150305/work/build/prev-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-L/var/tmp/portage/sys-devel/gcc-4.10.0_pre20150305/work/build/prev-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
-m64 -O2 -g -pipe -march=nocona -mtune=nocona -flto=jobserver -frandom-seed=1
-DIN_GCC -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall
-Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -DHAVE_CONFIG_H -static-libstdc++ -static-libgcc  -o
gnat1 ada/adadecode.o ada/adaint.o ada/argv.o ada/cio.o ada/cstreams.o
ada/env.o ada/init.o ada/initialize.o ada/raise.o ada/seh_init.o ada/targext.o
ada/cuintp.o ada/decl.o ada/rtfinal.o ada/rtinit.o ada/misc.o ada/utils.o
ada/utils2.o ada/trans.o ada/targtyps.o ada/a-charac.o ada/a-chlat1.o
ada/a-elchha.o ada/a-except.o ada/a-ioexce.o ada/ada.o ada/spark_xrefs.o
ada/ali.o ada/alloc.o ada/aspects.o ada/atree.o ada/butil.o ada/casing.o
ada/checks.o ada/comperr.o ada/csets.o ada/cstand.o ada/debug.o ada/debug_a.o
ada/einfo.o ada/elists.o ada/err_vars.o ada/errout.o ada/erroutc.o
ada/eval_fat.o ada/exp_aggr.o ada/exp_spark.o ada/exp_atag.o ada/exp_attr.o
ada/exp_cg.o ada/exp_ch11.o ada/exp_ch12.o ada/exp_ch13.o ada/exp_ch2.o
ada/exp_ch3.o ada/exp_ch4.o ada/exp_ch5.o ada/exp_ch6.o ada/exp_ch7.o
ada/exp_ch8.o ada/exp_ch9.o ada/exp_code.o ada/exp_dbug.o ada/exp_disp.o
ada/exp_dist.o ada/exp_fixd.o ada/exp_imgv.o ada/exp_intr.o ada/exp_pakd.o
ada/exp_prag.o ada/exp_sel.o ada/exp_smem.o ada/exp_strm.o ada/exp_tss.o
ada/exp_unst.o ada/exp_util.o ada/expander.o ada/fmap.o ada/fname-uf.o
ada/fname.o ada/freeze.o ada/frontend.o ada/g-byorma.o ada/g-hesora.o
ada/g-htable.o ada/g-spchge.o ada/g-speche.o ada/g-u3spch.o
ada/get_spark_xrefs.o ada/get_targ.o ada/ghost.o ada/gnat.o ada/gnatvsn.o
ada/hostparm.o ada/impunit.o ada/inline.o ada/interfac.o ada/itypes.o
ada/krunch.o ada/layout.o ada/lib-load.o ada/lib-util.o ada/lib-writ.o
ada/lib-xref.o ada/lib.o ada/live.o ada/namet-sp.o ada/namet.o ada/nlists.o
ada/nmake.o ada/opt.o ada/osint-c.o ada/osint.o ada/output.o ada/par.o
ada/par_sco.o ada/prep.o ada/prepcomp.o ada/put_spark_xrefs.o ada/put_scos.o
ada/repinfo.o ada/restrict.o ada/rident.o ada/rtsfind.o ada/s-addope.o
ada/s-assert.o ada/s-bitops.o ada/s-carun8.o ada/s-casuti.o ada/s-conca2.o
ada/s-conca3.o ada/s-conca4.o ada/s-conca5.o ada/s-conca6.o ada/s-conca7.o
ada/s-conca8.o ada/s-conca9.o ada/s-crc32.o ada/s-crtl.o ada/s-excdeb.o
ada/s-except.o ada/s-exctab.o ada/s-htable.o ada/s-imenne.o ada/s-imgenu.o
ada/s-mastop.o ada/s-memory.o ada/s-os_lib.o ada/s-parame.o ada/s-purexc.o
ada/s-restri.o ada/s-secsta.o ada/s-soflin.o ada/s-sopco3.o ada/s-sopco4.o
ada/s-sopco5.o ada/s-stache.o ada/s-stalib.o ada/s-stoele.o ada/s-strcom.o
ada/s-strhas.o ada/s-string.o ada/s-strops.o ada/s-traent.o ada/s-unstyp.o
ada/s-utf_32.o ada/s-valint.o ada/s-valuns.o ada/s-valuti.o ada/s-wchcnv.o
ada/s-wchcon.o ada/s-wchjis.o ada/scans.o ada/scil_ll.o ada/scn.o ada/scng.o
ada/scos.o ada/sdefault.o ada/sem.o ada/sem_aggr.o ada/sem_attr.o ada/sem_aux.o
ada/sem_case.o ada/sem_cat.o ada/sem_ch10.o ada/sem_ch11.o ada/sem_ch12.o
ada/sem_ch13.o ada/sem_ch2.o ada/sem_ch3.o ada/sem_ch4.o ada/sem_ch5.o
ada/sem_ch6.o ada/sem_ch7.o ada/sem_ch8.o ada/sem_ch9.o ada/sem_dim.o
ada/sem_disp.o ada/sem_dist.o ada/sem_elab.o ada/sem_elim.o ada/sem_eval.o
ada/sem_intr.o ada/sem_mech.o ada/sem_prag.o ada/sem_res.o ada/sem_scil.o
ada/sem_smem.o ada/sem_type.o ada/sem_util.o ada/sem_warn.o ada/set_targ.o
ada/sinfo-cn.o ada/sinfo.o ada/sinput-d.o ada/sinput-l.o ada/sinput.o
ada/snames.o ada/sprint.o ada/stand.o ada/stringt.o ada/style.o ada/styleg.o
ada/stylesw.o ada/switch-c.o ada/switch.o ada/system.o ada/table.o
ada/targparm.o ada/tbuild.o ada/tree_gen.o ada/tree_in.o ada/tree_io.o
ada/treepr.o ada/treeprs.o ada/ttypes.o ada/types.o ada/uintp.o ada/uname.o
ada/urealp.o ada/usage.o ada/validsw.o ada/warnsw.o ada/widechar.o
ada/back_end.o ada/gnat1drv.o ada/b_gnat1.o libbackend.a main.o 
libcommon-target.a libcommon.a ../libcpp/libcpp.a
../libdecnumber/libdecnumber.a attribs.o \
  libcommon-target.a libcommon.a ../libcpp/libcpp.a  
../libbacktrace/.libs/libbacktrace.a ../libiberty/libiberty.a
../libdecnumber/libdecnumber.a   -lisl -lmpc -lmpfr -lgmp -rdynamic -ldl  -lz
-m64 -O2 -g -pipe -march=nocona -mtune=nocona -flto=jobserver -frandom-seed=1

ends up with

/var/tmp/portage/sys-devel/gcc-4.10.0_pre20150305/work/gcc-4.10.0-20150305/gcc/ada/exp_aggr.adb:6570:0:
internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

Gcc is vanilla trunk revision 221246.
/var/tmp/portage/sys-devel/gcc-4.10.0_pre20150305/work/build/./prev-gcc/xg++ -v

Using built-in specs.
COLLECT_GCC=/var/tmp/portage/sys-devel/gcc-4.10.0_pre20150305/work/build/./prev-gcc/xg++
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-4.10.0_pre20150305/work/gcc-4.10.0-20150305/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.10.0-pre20150305
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.10.0-pre20150305/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.10.0-pre20150305
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.10.0-pre20150305/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.10.0-pre20150305/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.10.0-pre20150305/include/g++-v4
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.10.0-pre20150305/python
--enable-languages=c,c++,fortran,ada --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 4.10.0_pre20150305' --enable-libstdcxx-time
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64
--disable-altivec --disable-fixed-point --enable-targets=all --disable-libgcj
--enable-libgomp --disable-libmudflap --disable-libssp --enable-lto
--with-cloog --disable-isl-version-check --enable-libsanitizer
--with-build-config=bootstrap-lto
Thread model: posix
gcc version 4.10.0-pre20150305 20150306 (experimental) [trunk revision 221246]
(Gentoo 4.10.0_pre20150305)

Binutils are vanilla version 2.25.51.20150305 from git.

[Bug tree-optimization/65337] [5 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |build
             Target|                            |x86_64-*-*
          Component|bootstrap                   |tree-optimization
   Target Milestone|---                         |5.0
            Summary|5.0 bootstrap-lto gnat1     |[5 Regression]
                   |linktime ICE:               |bootstrap-lto gnat1
                   |gcc/ada/exp_aggr.adb:6570:0 |linktime ICE:
                   |: internal compiler error:  |gcc/ada/exp_aggr.adb:6570:0
                   |in forward_edge_to_pdom, at |: internal compiler error:
                   |tree-ssa-dce.c:1086         |in forward_edge_to_pdom, at
                   |                            |tree-ssa-dce.c:1086

[Bug tree-optimization/65337] [5 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I can reproduce this, but wonder if the bug isn't just earlier in CD-DCE where
the GIMPLE_COND should have been marked necessary.  The immediate
post-dominator is very far from the bb and has tons of incoming edges, some
PHIs are not marked as unnecessary and certainly aren't degenerate:

<bb 171>:
# _17 = PHI <0(15), 0(19), 0(21), 1(34), 0(115), 0(121), 0(129), 0(132),
0(137), 0(140), _112(143), 1(170), 0(31), 1(113), 0(50), 0(42), 0(37), 0(52),
0(46), 0(48)>
# JMPBUF_SAVE_926(ab) = PHI <JMPBUF_SAVE_6(ab)(15), JMPBUF_SAVE_590(ab)(19),
JMPBUF_SAVE_590(ab)(21), JMPBUF_SAVE_590(ab)(34), JMPBUF_SAVE_590(ab)(115),
JMPBUF_SAVE_590(ab)(121), JMPBUF_SAVE_590(ab)(129), JMPBUF_SAVE_590(ab)(132),
JMPBUF_SAVE_590(ab)(137), JMPBUF_SAVE_590(ab)(140), JMPBUF_SAVE_590(ab)(143),
JMPBUF_SAVE_590(ab)(170), JMPBUF_SAVE_590(ab)(31), JMPBUF_SAVE_590(ab)(113),
JMPBUF_SAVE_590(ab)(50), JMPBUF_SAVE_590(ab)(42), JMPBUF_SAVE_590(ab)(37),
JMPBUF_SAVE_590(ab)(52), JMPBUF_SAVE_590(ab)(46), JMPBUF_SAVE_590(ab)(48)>
# prephitmp_56 = PHI <addr_195(15), pretmp_285(19), pretmp_414(21),
pretmp_413(34), pretmp_418(115), pretmp_412(121), pretmp_286(129),
pretmp_419(132), pretmp_735(137), pretmp_713(140), pretmp_703(143),
pretmp_714(170), pretmp_801(31), pretmp_814(113), pretmp_352(50),
pretmp_353(42), pretmp_355(37), pretmp_189(52), pretmp_267(46), pretmp_261(48)>
# DEBUG addr => (const system__address) JMPBUF_SAVE_926(ab)
_796 = system__soft_links__set_jmpbuf_address;
_796 (prephitmp_56);

is the post_dom_bb, and

<bb 117>:
# DEBUG n => _201
_10 = _264;
_601 = _264 * 32;
_233 = _262 + _601;
_724 = MEM[(struct atree__atree_private_part__node_record[2147483648] *)_233 +
104B];
# DEBUG D#7737 => (types__node_id___XDLU_0__99999999) _724
# DEBUG id => D#7737
# DEBUG e => D#7737
_732 = (sizetype) _724;
_733 = _732 + 1;
_734 = *_262[_733].nkind;
_727 = _734 + 243;
if (_727 > 11)
  goto <bb 118>;
else
  goto <bb 122>;

is e->src.  Honza, this is your code, can you please have a look?

[Bug tree-optimization/65337] [5 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-03-13
     Ever confirmed|0                           |1

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Thus confirmed at least.  IIRC this is a tricky area ;)  (but the issue is
surely latent since quite some time)

[Bug tree-optimization/65337] [5 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

--- Comment #3 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Indeed, the cd-dce is one the worst documented of the tradition SSA
optimizations. I commented on this to Jakum on IRC.  The mechanizm that should
prevent conditional from being removed is the control dependency. For every PHI
argument, the control dependent conditional is marked live.
So it is a question why the control dependent conditional is not live here -
one of problems I remember was that control dependency is defined for basic
blocks, while PHI handling needs it for edges.  This mostly does not matter
because critical edges are split, but with abnormal edges perhaps we manage to
get things wrong.

I am finishing paper today and fly to Vancouver at Tuesday, but will try to
look into this as time allows.

[Bug tree-optimization/65337] [5 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2

[Bug tree-optimization/65337] [5/6 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|5.0                         |5.2

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 5.1 has been released.

[Bug tree-optimization/65337] [5/6 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2015-03-13 00:00:00         |2015-4-30

--- Comment #5 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Still ICE during LTObootstrap on PPC64 (gcc110). I will try to at least figure
out what goes wrong with the PHI (if it is wrong control dependency due to
critical edge or something else)

I suppose we can relax the check to:

  degenerate_phi_p (phi) || SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_phi_result
(phi)

but we may need to trigger SSA rewrite on resulting code as cddce will break
dominance conditions on the PHI.

[Bug tree-optimization/65337] [5/6 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

--- Comment #6 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Patch posted to https://gcc.gnu.org/ml/gcc-patches/2015-05/msg02876.html

[Bug tree-optimization/65337] [5/6 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[steven at uplinklabs dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

--- Comment #7 from Steven Noonan <steven at uplinklabs dot net> ---
Tried applying the patch mentioned in comment 6 and doing a build using
--with-build-config=bootstrap-lto. Ended with:

[...]
/build/gcc-multilib/src/gcc-build/./prev-gcc/xgcc
-B/build/gcc-multilib/src/gcc-build/./prev-gcc/
-B/usr/x86_64-unknown-linux-gnu/bin
/ -B/usr/x86_64-unknown-linux-gnu/bin/ -B/usr/x86_64-unknown-linux-gnu/lib/
-isystem /usr/x86_64-unknown-linux-gnu/include -isystem /
usr/x86_64-unknown-linux-gnu/sys-include    -c -g -O2 -flto=jobserver
-frandom-seed=1  -gnatpg  -W -Wall -nostdinc -I- -I. -Iada/gene
rated -Iada -I/build/gcc-multilib/src/gcc-5-20150602/gcc/ada
-I/build/gcc-multilib/src/gcc-5-20150602/gcc/ada/gcc-interface /build/gc
c-multilib/src/gcc-5-20150602/gcc/ada/comperr.adb -o ada/comperr.o
[...]
raised STORAGE_ERROR : stack overflow or erroneous memory access  
/build/gcc-multilib/src/gcc-5-20150602/gcc/ada/gcc-interface/Make-lang.in:119:
recipe for target 'ada/comperr.o' failed

Ideas?

[Bug tree-optimization/65337] [5/6 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[hubicka at ucw dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

--- Comment #8 from Jan Hubicka <hubicka at ucw dot cz> ---
 [...]
> raised STORAGE_ERROR : stack overflow or erroneous memory access  
> /build/gcc-multilib/src/gcc-5-20150602/gcc/ada/gcc-interface/Make-lang.in:119:
> recipe for target 'ada/comperr.o' failed
> 
> Ideas?

This is most likely an independent issue.  Can you, please, attach a backtrace?

Honza

[Bug tree-optimization/65337] [5/6 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[steven at uplinklabs dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

--- Comment #9 from Steven Noonan <steven at uplinklabs dot net> ---
Sure.

$ gdb --args
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-build/./prev-gcc/xgcc
-B/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-build/./prev-gcc/
-B/usr/x86_64-unknown-linux-gnu/bin/ -B/usr/x86_64-unknown-linux-gnu/bin/
-B/usr/x86_64-unknown-linux-gnu/lib/ -isystem
/usr/x86_64-unknown-linux-gnu/include -isystem
/usr/x86_64-unknown-linux-gnu/sys-include    -c -g -O2 -flto=jobserver
-frandom-seed=1  -gnatpg  -W -Wall -nostdinc -I- -I. -Iada/generated -Iada
-I/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/ada
-I/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/ada/gcc-interface
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/ada/comperr.adb
-o ada/comperr.o
GNU gdb (GDB) 7.9.1
Copyright (C) 2015 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-build/./prev-gcc/xgcc...done.
warning: File
"/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-build/gcc/.gdbinit"
auto-loading has been declined by your `auto-load safe-path' set to
"$debugdir:$datadir/auto-load".
To enable execution of this file add
        add-auto-load-safe-path
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-build/gcc/.gdbinit
line to your configuration file "/home/snoonan/.gdbinit".
To completely disable this security protection add
        set auto-load safe-path /
line to your configuration file "/home/snoonan/.gdbinit".
For more information about this security protection see the
"Auto-loading safe path" section in the GDB manual.  E.g., run from the shell:
        info "(gdb)Auto-loading safe path"
(gdb) set follow-fork-mode child
(gdb) run
Starting program:
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-build/prev-gcc/xgcc
-B/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-build/./prev-gcc/
-B/usr/x86_64-unknown-linux-gnu/bin/ -B/usr/x86_64-unknown-linux-gnu/bin/
-B/usr/x86_64-unknown-linux-gnu/lib/ -isystem
/usr/x86_64-unknown-linux-gnu/include -isystem
/usr/x86_64-unknown-linux-gnu/sys-include -c -g -O2 -flto=jobserver
-frandom-seed=1 -gnatpg -W -Wall -nostdinc -I- -I. -Iada/generated -Iada
-I/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/ada
-I/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/ada/gcc-interface
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/ada/comperr.adb
-o ada/comperr.o
[New process 16017]
process 16017 is executing new program:
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-build/prev-gcc/gnat1

Program received signal SIGSEGV, Segmentation fault.
[Switching to process 16017]
0x0000000000c354ed in ei_edge (i=...) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/basic-block.h:460
460       return EDGE_I (ei_container (i), i.index);
(gdb) thread apply all bt full

Thread 2 (process 16017):
#0  0x0000000000c354ed in ei_edge (i=...) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/basic-block.h:460
No locals.
#1  0x0000000000c376cf in inverted_post_order_compute (post_order=0x2e3d9a0,
start_points=0x2bb0858 <bb_contains_live_stmts>) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/cfganal.c:837
        ei = {
          index = 0, 
          container = 0x7ffff68543a8
        }
        pred = 0x7ffff6c8b8be <malloc+110>
        has_unvisited_bb = false
        bb = 0x0
        stack = 0x2e1e740
        sp = 171
        post_order_num = 0
        visited = 0x2decb40
        __FUNCTION__ = "inverted_post_order_compute"
#2  0x00000000011ddcdc in remove_dead_stmt (i=0x7fffffffc950,
bb=0x7ffff5ad07b8) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/tree-ssa-dce.c:1076
        postorder = 0x2e3d9a0
        postorder_num = 0
        ei = {
          index = 4121675328, 
          container = 0x7fffffffc860
        }
        e = 0x0
        e2 = 0xdc9474 <gimple_call_flags(gimple_statement_base const*)+47>
        stmt = 0x7ffff5abc640
        __FUNCTION__ = "remove_dead_stmt"
#3  0x00000000011de918 in eliminate_unnecessary_stmts () at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/tree-ssa-dce.c:1360
        something_changed = true
        bb = 0x7ffff5ad07b8
        gsi = {
          ptr = 0x7ffff5abc640, 
          seq = 0x7ffff5ad07f8, 
          bb = 0x7ffff5ad07b8
        }
        psi = {
          ptr = 0x0, 
          seq = 0x7ffff5ad07f8, 
          bb = 0x7ffff5ad07b8
        }
        stmt = 0x7ffff5abc640
        call = 0x0
        h = {
          m_vec = 0x2e407b0
        }
        __FUNCTION__ = "eliminate_unnecessary_stmts"
#4  0x00000000011df279 in perform_tree_ssa_dce (aggressive=true) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/tree-ssa-dce.c:1629
        something_changed = false
#5  0x00000000011df35a in tree_ssa_cd_dce () at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/tree-ssa-dce.c:1670
No locals.
#6  0x00000000011df4c7 in (anonymous namespace)::pass_cd_dce::execute
(this=0x2c14da0) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/tree-ssa-dce.c:1735
No locals.
#7  0x0000000000fdf3b5 in execute_one_pass (pass=0x2c14da0) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/passes.c:2330
        todo_after = 0
        gate_status = true
        __FUNCTION__ = "execute_one_pass"
#8  0x0000000000fdf5ef in execute_pass_list_1 (pass=0x2c14da0) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/passes.c:2382
        __FUNCTION__ = "execute_pass_list_1"
#9  0x0000000000fdf620 in execute_pass_list_1 (pass=0x2c149e0) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/passes.c:2383
        __FUNCTION__ = "execute_pass_list_1"
#10 0x0000000000fdf660 in execute_pass_list (fn=0x7ffff59fc7e0, pass=0x2c14860)
at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/passes.c:2393
No locals.
#11 0x0000000000fddfe3 in do_per_function_toporder (callback=0xfdf638
<execute_pass_list(function*, opt_pass*)>, data=0x2c14860) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/passes.c:1728
        node = 0x7ffff685ac40
        hook = 0x2c04f40
        order_idx = 0x7fffffffcb00
        i = 0
        __FUNCTION__ = "do_per_function_toporder"
#12 0x0000000000fe0200 in execute_ipa_pass_list (pass=0x2c14800) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/passes.c:2736
        __FUNCTION__ = "execute_ipa_pass_list"
#13 0x0000000000c87712 in ipa_passes () at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/cgraphunit.c:2171
        passes = 0x2c13500
#14 0x0000000000c87b0e in symbol_table::compile (this=0x7ffff684f000) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/cgraphunit.c:2312
No locals.
#15 0x0000000000c87d86 in symbol_table::finalize_compilation_unit
(this=0x7ffff684f000) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/cgraphunit.c:2461
No locals.
#16 0x00000000007f007e in gnat_write_global_declarations () at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/ada/gcc-interface/utils.c:5217
        i = 339
        iter = 0x0
#17 0x00000000010ca5da in compile_file () at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/toplev.c:608
No locals.
#18 0x00000000010cc9a3 in do_compile () at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/toplev.c:2076
        i = 1
#19 0x00000000010ccbd3 in toplev::main (this=0x7fffffffcdb0, argc=34,
argv=0x7fffffffceb8) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/toplev.c:2174
No locals.
#20 0x000000000199b8f4 in main (argc=34, argv=0x7fffffffceb8) at
/home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/main.c:39
        toplev = {
          m_use_TV_TOTAL = true, 
          m_init_signals = true
        }
(gdb)

[Bug tree-optimization/65337] [5/6 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[hubicka at ucw dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

--- Comment #10 from Jan Hubicka <hubicka at ucw dot cz> ---
> /home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-build/prev-gcc/gnat1
> 
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to process 16017]
> 0x0000000000c354ed in ei_edge (i=...) at
> /home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/basic-block.h:460
> 460       return EDGE_I (ei_container (i), i.index);
> (gdb) thread apply all bt full
> 
> Thread 2 (process 16017):
> #0  0x0000000000c354ed in ei_edge (i=...) at
> /home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/basic-block.h:460
> No locals.
> #1  0x0000000000c376cf in inverted_post_order_compute (post_order=0x2e3d9a0,
> start_points=0x2bb0858 <bb_contains_live_stmts>) at
> /home/snoonan/Development/ec2-packages/gcc-multilib/src/gcc-5-20150602/gcc/cfganal.c:837

I see, it looks like a bug in inverted_post_order_compute that is different ICE
I saw at
ppc64.  I will take a look.

Honza

[Bug tree-optimization/65337] [5/6 Regression] bootstrap-lto gnat1 linktime ICE: gcc/ada/exp_aggr.adb:6570:0: internal compiler error: in forward_edge_to_pdom, at tree-ssa-dce.c:1086

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65337

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|5.2                         |5.3

--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 5.2 is being released, adjusting target milestone to 5.3.