[Bug rtl-optimization/20539] New: ICE in simplify_subreg, at simplify-rtx.c:3674

["John at xza5 dot com" <gcc-bugzilla at gcc dot gnu dot org>]

It's quite a small testcase.  I hacked it down to about 3700 lines...
More seriously, I haven't tried hacking about the (member) function
that's causing the problem - I've just removed a load of irrelevant
stuff from the file.

This is the failure I found:

[ALL]$ /usr/local/gcc/gcc-4.0-20050312/bin/g++  -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../../sources/gcc-4.0-20050312/configure
--enable-languages=c,c++ --enable-__cxa_atexit --disable-checking --disable-nls
--prefix=/usr/local/gcc/gcc-4.0-20050312
Thread model: posix
gcc version 4.0.0 20050312 (prerelease)
[ALL]$ /usr/local/gcc/gcc-4.0-20050312/bin/g++  -S testcase1.ii
testcase1.ii: In member function 'void S::wave_1000130()':
testcase1.ii:3691: internal compiler error: Floating point exception
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.


Try with a compiler built with checking enabled:

[ALL]$ /usr/local/gcc/gcc-4.0-20050312-ggdb3/bin/g++  -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../../sources/gcc-4.0-20050312/configure
--enable-languages=c,c++ --enable-__cxa_atexit --disable-checking --disable-nls
--prefix=/usr/local/gcc/gcc-4.0-20050312 : (reconfigured)
../../sources/gcc-4.0-20050312/configure --enable-languages=c,c++
--enable-__cxa_atexit --disable-nls --prefix=/usr/local/gcc/gcc-4.0-20050312-ggdb3
Thread model: posix
gcc version 4.0.0 20050312 (prerelease)
[ALL]$ /usr/local/gcc/gcc-4.0-20050312-ggdb3/bin/g++  -S testcase1.ii
testcase1.ii: In member function 'void S::wave_1000130()':
testcase1.ii:3380: internal compiler error: in simplify_subreg, at
simplify-rtx.c:3674
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
[ALL]$

-- 
           Summary: ICE in simplify_subreg, at simplify-rtx.c:3674
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: John at xza5 dot com
                CC: gcc-bugs at gcc dot gnu dot org,giovannibajo at libero
                    dot it
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20539