[Bug c/25583] New: ICE in instantiate_virtual_regs_lossage on x86-64 EM64T system

["rstancha at cse dot wustl dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

I get an internal compiler error when compiling without optimizations on the
following code:

/////////////////////////////////////////////////////////
#include <emmintrin.h>

int buggy(double val1, double val2){
    __m128d t1 = _mm_load_sd( &val1 );
    __m128d t2 = _mm_load_sd( &val2 );
    __m128d r = _mm_cmpgt_sd(t1, t2);
    return _mm_cvtsd_si32(r);
}

int main(int argc, char ** argv){
    return buggy(3.0, 3.8);
}
/////////////////////////////////////////////////////
The command used is:
gcc -c buggy.c -o buggy.o

and the exact error text is:
/usr/lib/gcc/x86_64-pc-linux-gnu/3.4.4/include/emmintrin.h: In function
`_mm_cmpgt_sd':
/usr/lib/gcc/x86_64-pc-linux-gnu/3.4.4/include/emmintrin.h:396: internal
compiler error: in instantiate_virtual_regs_lossage, at function.c:3781
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://bugs.gentoo.org/> for instructions.
Preprocessed source stored into /tmp/ccSdZXLX.out file, please attach this to
your bugreport.


Interestingly, adding an optimization of -O1 and up eliminates this error.  I
experience the same problem with 3.4.3.

Some system info:
System uname: 2.6.12-gentoo-r6 x86_64 Intel(R) Xeon(TM) CPU 2.80GHz
Gentoo Base System version 1.6.12
sys-devel/autoconf:  2.13, 2.59-r6
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6
sys-devel/binutils:  2.15.92.0.2-r10
sys-devel/libtool:   1.5.18-r1
virtual/os-headers:  2.6.11-r2


-- 
           Summary: ICE in instantiate_virtual_regs_lossage on x86-64 EM64T
                    system
           Product: gcc
           Version: 3.4.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rstancha at cse dot wustl dot edu
 GCC build triplet: x86_64-pc-linux-gnu
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25583