[Bug c++/42739] New: [4.5 Regression] ICE with computed goto, destructors, and optimization

["gottreu at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

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I compiled the GCC snapshot from 2010-01-07 on 32bit Ubuntu 10.04.  I got the
same results using the SVN version from last night (Jan 12, 2010) on 64bit
Ubuntu 9.04.

The snippet is nonsensical, but it compiles fine with 4.3.3 and 4.4.3.

So far I've only noticed the error when using '-O2', '-O3', '-Os', or '-O
-ftree-vrp'.  With each of those flags, the error does not occur if you also
supply '-fno-exceptions'.

I wonder if it's related to http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42698

gottreu@boosh:~/gsl$ cat ICE.cpp 

struct s { ~s() { s(); }};
int f() {
M:      s o = s(); f(); f();
L:      goto *(f() ? &&L : &&M);
        return 0;
}


gottreu@boosh:~/gsl$ g++4.5- -v -S -O2 ICE.cpp 
Using built-in specs.
COLLECT_GCC=g++4.5-
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/i686-pc-linux-gnu/4.5.0/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: ./configure --enable-lto --program-suffix=4.5-
Thread model: posix
gcc version 4.5.0 20100107 (experimental) (GCC) 
COLLECT_GCC_OPTIONS='-v' '-S' '-O2' '-shared-libgcc' '-mtune=generic'
 /usr/local/libexec/gcc/i686-pc-linux-gnu/4.5.0/cc1plus -quiet -v -D_GNU_SOURCE
ICE.cpp -quiet -dumpbase ICE.cpp -mtune=generic -auxbase ICE -O2 -version -o
ICE.s
GNU C++ (GCC) version 4.5.0 20100107 (experimental) (i686-pc-linux-gnu)
        compiled by GNU C version 4.5.0 20100107 (experimental), GMP version
4.3.1, MPFR version 2.4.2-p1, MPC version 0.8.1
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
ignoring nonexistent directory
"/usr/local/lib/gcc/i686-pc-linux-gnu/4.5.0/../../../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/lib/gcc/i686-pc-linux-gnu/4.5.0/../../../../include/c++/4.5.0

/usr/local/lib/gcc/i686-pc-linux-gnu/4.5.0/../../../../include/c++/4.5.0/i686-pc-linux-gnu

/usr/local/lib/gcc/i686-pc-linux-gnu/4.5.0/../../../../include/c++/4.5.0/backward
 /usr/local/include
 /usr/local/lib/gcc/i686-pc-linux-gnu/4.5.0/include
 /usr/local/lib/gcc/i686-pc-linux-gnu/4.5.0/include-fixed
 /usr/include
End of search list.
GNU C++ (GCC) version 4.5.0 20100107 (experimental) (i686-pc-linux-gnu)
        compiled by GNU C version 4.5.0 20100107 (experimental), GMP version
4.3.1, MPFR version 2.4.2-p1, MPC version 0.8.1
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: 06ee28012e9fee55f767de400b682e47
ICE.cpp: In function ‘int f()’:
ICE.cpp:2:5: internal compiler error: in redirect_eh_edge_1, at tree-eh.c:2112
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


-- 
           Summary: [4.5 Regression] ICE with computed goto, destructors,
                    and optimization
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: gottreu at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42739