http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50222
Bug #: 50222
Summary: ICE with -O{1,2} -funswitch-loops
-ftree-loop-distribution
Classification: Unclassified
Product: gcc
Version: 4.6.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: franxisco1988+...@gmail.com
Created attachment 25123
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25123
Temporary saved file
I'm hitting an ICE in the attached file, the ICE happens with either -O1 and
-O2 with gcc being killed for a segmentation fault.
Here is the output of $ LANG="C" gcc -O1 -funswitch-loops
-ftree-loop-distribution -I. -I.. -I../.. nutenc.c -include
libavutil/internal.h -I ../../ -c -save-temps -v
Using built-in specs.
Reading specs from /usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/vanilla.specs
Reading specs from /usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/hardenednossp.specs
Reading specs from /usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/hardenednopie.specs
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/4.6.1/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.6.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/configure --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.6.1
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.1
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.1/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.1/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/include/g++-v4
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec
--disable-fixed-point --without-ppl --without-cloog --enable-lto --enable-nls
--without-included-gettext --with-system-zlib --disable-werror
--enable-secureplt --enable-multilib --enable-libmudflap --disable-libssp
--enable-esp --enable-libgomp
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.6.1/python
--enable-checking=release --disable-libgcj --enable-languages=c,c++
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --with-bugurl=http://bugs.gentoo.org/
--with-pkgversion='Gentoo Hardened 4.6.1-r1 p1.0, pie-0.4.5'
Thread model: posix
gcc version 4.6.1 (Gentoo Hardened 4.6.1-r1 p1.0, pie-0.4.5)
COLLECT_GCC_OPTIONS='-O1' '-funswitch-loops' '-ftree-loop-distribution' '-I'
'.' '-I' '..' '-I' '../..' '-include' 'libavutil/internal.h' '-I' '../../' '-c'
'-save-temps' '-v' '-mtune=generic' '-march=x86-64'
/usr/libexec/gcc/x86_64-pc-linux-gnu/4.6.1/cc1 -E -quiet -v -I . -I .. -I
../.. -I ../../ -include libavutil/internal.h nutenc.c -D_FORTIFY_SOURCE=2
-mtune=generic -march=x86-64 -funswitch-loops -ftree-loop-distribution -O1
-fpch-preprocess -o nutenc.i
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/../../../../x86_64-pc-linux-gnu/include"
ignoring duplicate directory "../../"
#include "..." search starts here:
#include <...> search starts here:
.
..
../..
/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/include
/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/include-fixed
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-O1' '-funswitch-loops' '-ftree-loop-distribution' '-I'
'.' '-I' '..' '-I' '../..' '-include' 'libavutil/internal.h' '-I' '../../' '-c'
'-save-temps' '-v' '-mtune=generic' '-march=x86-64'
/usr/libexec/gcc/x86_64-pc-linux-gnu/4.6.1/cc1 -fpreprocessed nutenc.i -quiet
-dumpbase nutenc.c -mtune=generic -march=x86-64 -auxbase nutenc -O1 -version
-funswitch-loops -ftree-loop-distribution -o nutenc.s
GNU C (Gentoo Hardened 4.6.1-r1 p1.0, pie-0.4.5) version 4.6.1
(x86_64-pc-linux-gnu)
compiled by GNU C version 4.6.1, GMP version 5.0.2, MPFR version
3.0.1-p4, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C (Gentoo Hardened 4.6.1-r1 p1.0, pie-0.4.5) version 4.6.1
(x86_64-pc-linux-gnu)
compiled by GNU C version 4.6.1, GMP version 5.0.2, MPFR version
3.0.1-p4, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: ee3b77d3e57fd2e78f1e57adb19b4a68
nutenc.c: In function 'write_header':
nutenc.c:580:12: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugs.gentoo.org/> for instructions.
And the output of $ LANG="C" gcc -O2 -funswitch-loops -ftree-loop-distribution
-I. -I.. -I../.. nutenc.c -include libavutil/internal.h -I ../../ -c
-save-temps -v
Using built-in specs.
Reading specs from /usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/vanilla.specs
Reading specs from /usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/hardenednossp.specs
Reading specs from /usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/hardenednopie.specs
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/4.6.1/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.6.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/configure --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.6.1
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.1
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.1/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.6.1/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/include/g++-v4
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec
--disable-fixed-point --without-ppl --without-cloog --enable-lto --enable-nls
--without-included-gettext --with-system-zlib --disable-werror
--enable-secureplt --enable-multilib --enable-libmudflap --disable-libssp
--enable-esp --enable-libgomp
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.6.1/python
--enable-checking=release --disable-libgcj --enable-languages=c,c++
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --with-bugurl=http://bugs.gentoo.org/
--with-pkgversion='Gentoo Hardened 4.6.1-r1 p1.0, pie-0.4.5'
Thread model: posix
gcc version 4.6.1 (Gentoo Hardened 4.6.1-r1 p1.0, pie-0.4.5)
COLLECT_GCC_OPTIONS='-O2' '-funswitch-loops' '-ftree-loop-distribution' '-I'
'.' '-I' '..' '-I' '../..' '-include' 'libavutil/internal.h' '-I' '../../' '-c'
'-save-temps' '-v' '-mtune=generic' '-march=x86-64'
/usr/libexec/gcc/x86_64-pc-linux-gnu/4.6.1/cc1 -E -quiet -v -I . -I .. -I
../.. -I ../../ -include libavutil/internal.h nutenc.c -D_FORTIFY_SOURCE=2
-mtune=generic -march=x86-64 -funswitch-loops -ftree-loop-distribution -O2
-fpch-preprocess -o nutenc.i
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/../../../../x86_64-pc-linux-gnu/include"
ignoring duplicate directory "../../"
#include "..." search starts here:
#include <...> search starts here:
.
..
../..
/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/include
/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.1/include-fixed
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-O2' '-funswitch-loops' '-ftree-loop-distribution' '-I'
'.' '-I' '..' '-I' '../..' '-include' 'libavutil/internal.h' '-I' '../../' '-c'
'-save-temps' '-v' '-mtune=generic' '-march=x86-64'
/usr/libexec/gcc/x86_64-pc-linux-gnu/4.6.1/cc1 -fpreprocessed nutenc.i -quiet
-dumpbase nutenc.c -mtune=generic -march=x86-64 -auxbase nutenc -O2 -version
-funswitch-loops -ftree-loop-distribution -o nutenc.s
GNU C (Gentoo Hardened 4.6.1-r1 p1.0, pie-0.4.5) version 4.6.1
(x86_64-pc-linux-gnu)
compiled by GNU C version 4.6.1, GMP version 5.0.2, MPFR version
3.0.1-p4, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C (Gentoo Hardened 4.6.1-r1 p1.0, pie-0.4.5) version 4.6.1
(x86_64-pc-linux-gnu)
compiled by GNU C version 4.6.1, GMP version 5.0.2, MPFR version
3.0.1-p4, MPC version 0.8.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: ee3b77d3e57fd2e78f1e57adb19b4a68
nutenc.c: In function 'write_header':
nutenc.c:580:12: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugs.gentoo.org/> for instructions.
The backtrace by gdb is the following:
#0 0x00000000008796bf in rename_use_op (bb=0x7ffff67d0b60) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/tree-vect-loop-manip.c:55
#1 rename_variables_in_bb (bb=0x7ffff67d0b60) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/tree-vect-loop-manip.c:95
#2 0x000000000087971e in rename_variables_in_loop (loop=0x7ffff67ac908) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/tree-vect-loop-manip.c:111
#3 0x00000000007ab38a in copy_loop_before (loop=<value optimized out>,
stmts=<value optimized out>) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/tree-loop-distribution.c:137
#4 generate_loops_for_partition (loop=<value optimized out>, stmts=<value
optimized out>) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/tree-loop-distribution.c:171
#5 generate_code_for_partition (loop=<value optimized out>, stmts=<value
optimized out>) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/tree-loop-distribution.c:395
#6 ldist_gen (loop=<value optimized out>, stmts=<value optimized out>) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/tree-loop-distribution.c:1133
#7 distribute_loop (loop=<value optimized out>, stmts=<value optimized out>)
at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/tree-loop-distribution.c:1218
#8 distribute_loop (loop=<value optimized out>, stmts=<value optimized out>)
at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/tree-loop-distribution.c:1160
#9 0x00000000007ab78c in tree_loop_distribution () at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/tree-loop-distribution.c:1274
#10 0x00000000006d2c51 in execute_one_pass (pass=0x112e0a0) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/passes.c:1556
#11 0x00000000006d2f1d in execute_pass_list (pass=0x112e0a0) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/passes.c:1611
#12 0x00000000006d2f2f in execute_pass_list (pass=0x112f180) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/passes.c:1612
#13 0x00000000006d2f2f in execute_pass_list (pass=0x112e400) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/passes.c:1612
#14 0x00000000007b32e5 in tree_rest_of_compilation (fndecl=0x7ffff6bb5900) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/tree-optimize.c:422
#15 0x000000000090db6f in cgraph_expand_function (node=0x7ffff6bcf2c0) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/cgraphunit.c:1576
#16 0x000000000090f958 in cgraph_expand_all_functions () at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/cgraphunit.c:1635
#17 cgraph_optimize () at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/cgraphunit.c:1899
#18 0x000000000090fd9a in cgraph_finalize_compilation_unit () at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/cgraphunit.c:1096
#19 0x00000000004b5685 in c_write_global_declarations () at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/c-decl.c:9871
#20 0x0000000000772758 in compile_file (argc=26, argv=0x7fffffffcac8) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/toplev.c:591
#21 do_compile (argc=26, argv=0x7fffffffcac8) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/toplev.c:1900
#22 toplev_main (argc=26, argv=0x7fffffffcac8) at
/var/tmp/portage/sys-devel/gcc-4.6.1-r1/work/gcc-4.6.1/gcc/toplev.c:1963
#23 0x00007ffff6f74d6d in __libc_start_main () from /lib64/libc.so.6
#24 0x00000000004a3165 in _start ()
