[Bug c++/24367] New: unrecognizable insn with -fPIC -O2 -funroll-loops

[waldi at debian dot org]

g++ -g -Wall -fPIC -O2 -funroll-loops -o /dev/null -c disk.cpp
disk.cpp: In function 'char* test(const char*, const char*)':
disk.cpp:13: error: unrecognizable insn:
(insn 542 541 544 26 (set (reg/f:SI 84)
        (plus:SI (reg:SI 12 %r12)
            (const:SI (plus:SI (unspec:SI [
                            (symbol_ref:SI ("_ZZ4testPKcS0_E8rtn_path") [flags
0x2] <var_decl 0x77db29a0 rtn_path>)
                        ] 112)
                    (const_int 1024 [0x400]))))) -1 (nil)
    (nil))
disk.cpp:13: internal compiler error: in extract_insn, at recog.c:2084

Code:
char *test(const char *parent, const char *child)
{
        static char rtn_path[1024];
        char *s = rtn_path;
        char *s_end = rtn_path + sizeof(rtn_path);
        const char *s2 = child;

        while( *s != '\0' )
                s++;
        while( (s < s_end) && (*s2 != '\0') )
                *s++ = *s2++;
        return(rtn_path);
}


-- 
           Summary: unrecognizable insn with -fPIC -O2 -funroll-loops
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: waldi at debian dot org
GCC target triplet: s390-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24367