[Bug tree-optimization/37421] New: ICE in vn_reference_insert_pieces at tree-ssa-sccvn.c:1131

[dnovillo at gcc dot gnu dot org]

Found with this test case.  Still have not analyzed it, so I'm not quite sure
where we're getting confused:

#include <stdio.h>
#include <string.h>

inline int
bci (const float &source)
{
 int dest;
 memcpy (&dest, &source, sizeof (dest));
 return dest;
}

inline float
bcf (const int &source)
{
 float dest;
 memcpy (&dest, &source, sizeof (dest));
 return dest;
}

float
Foo ()
{
 const int foo = bci (0.0f);
 int bar = foo;
 const int baz = foo & 1;
 if (!baz && (foo & 2))
   bar = 0;
 return bcf (bar);
}

main ()
{
  printf ("Foo() = %f\n", Foo());
}

$ <mainline>/bin/g++ -o mathutil -O2 mathutil.cc
mathutil.cc: In function 'float Foo()':
mathutil.cc:21: internal compiler error: in vn_reference_insert_pieces, at
tree-ssa-sccvn.c:1131
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


-- 
           Summary: ICE in vn_reference_insert_pieces at tree-ssa-
                    sccvn.c:1131
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dnovillo at gcc dot gnu dot org
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37421