[Bug c++/58537] New: internal compiler error: in gen_rtx_SUBREG, at emit-rtl.c:776

[cas43 at cs dot stanford.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58537

            Bug ID: 58537
           Summary: internal compiler error: in gen_rtx_SUBREG, at
                    emit-rtl.c:776
           Product: gcc
           Version: 4.8.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: cas43 at cs dot stanford.edu

Created attachment 30898
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30898&action=edit
Program that triggers ICE

When compiling the attached program like this (all options except -c are
required):

g++ -c -march=nocona -O2 -funroll-loops -fno-signed-zeros -gdwarf-2  prog.cpp

I get this result

prog.cpp: In member function ‘SYMMETRIC_MATRIX<float> TORUS<T>::Hessian(const
TV&) const [with T = float; TORUS<T>::TV = VECTOR<float>]’:
prog.cpp:102:1: internal compiler error: in gen_rtx_SUBREG, at emit-rtl.c:776
 }
 ^
0x6d5fbb gen_rtx_SUBREG(machine_mode, rtx_def*, int)
    ../../s-4.8/gcc/emit-rtl.c:776
0xa15d2c dead_debug_insert_temp(dead_debug_local*, unsigned int, rtx_def*,
debug_temp_where)
    ../../s-4.8/gcc/valtrack.c:731
0xc04e9f dce_process_block
    ../../s-4.8/gcc/dce.c:995
0xc04e9f fast_dce
    ../../s-4.8/gcc/dce.c:1068
0xc05544 rest_of_handle_fast_dce
    ../../s-4.8/gcc/dce.c:1132
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.



compiler version:

Using built-in specs.
COLLECT_GCC=/home/craig/new-gcc/i-4.8/bin/g++
COLLECT_LTO_WRAPPER=/home/craig/new-gcc/i-4.8/libexec/gcc/x86_64-unknown-linux-gnu/4.8.2/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../s-4.8/configure --prefix=/home/craig/new-gcc/i-4.8
Thread model: posix
gcc version 4.8.2 20130925 (prerelease) (GCC) 



I get similar results with this version:

Using built-in specs.
COLLECT_GCC=/home/craig/new-gcc/i-trunk/bin/g++
COLLECT_LTO_WRAPPER=/home/craig/new-gcc/i-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../s-trunk/configure --prefix=/home/craig/new-gcc/i-trunk
Thread model: posix
gcc version 4.9.0 20130730 (experimental) (GCC) 


The program compiles cleanly with this version (even with -Wall):

Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.6/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.6.3-1ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.6 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object
--enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i686
--with-tune=generic --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) 

And it also builds cleanly with a fairly recent build of clang:

clang version 3.4 (trunk 187482)
Target: x86_64-unknown-linux-gnu
Thread model: posix