[Bug target/44734] New: GCC compiled to run on mips platform ICE's in def_builtin_1 ()

["raj dot khem at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

There seems to be wrong code generated when cross-gcc (x86_64->mips) is used to
compile gcc for mips target.

Program received signal SIGSEGV, Segmentation fault.
0x004940ac in def_builtin_1 (fncode=BUILT_IN_HUGE_VAL, name=<value optimized
out>, 
    fnclass=BUILT_IN_NORMAL, fntype=<value optimized out>, libtype=0x0,
both_p=0 '\000', 
    fallback_p=0 '\000', nonansi_p=0 '\000', fnattrs=0x2adc42b8, implicit_p=1
'\001')
    at
/scratch/oe/work/mips-oe-linux-uclibc/gcc-4.5-r4.1+svnr161450/gcc-4.5/gcc/c-common.c:5186
5186      built_in_decls[(int) fncode] = decl;


When I debugged through it then I see that in this function def_builtin_1
its trying to access 'fncode' which comes in a0 into function it stores it into
s2 and then later it moves it into s5 and it uses s5 later to generate the
offset into the array built_in_decls[(int) fncode] but the this move into s5
doesnt happen in all execution paths and it gets a bogus high value into s5
which it thinks is an offset into array and then dies. The case where s5 is not
populated correctly is when in following assert (!both_p && fallback_p) is true
then it does not have to compute the || and it follows a different execution
path.

gcc_assert ((!both_p && fallback_p)                                             
              || !strncmp (name, "__builtin_",                                  
                           strlen ("__builtin_")));   


I have attached the objdump output of c-common.o


-- 
           Summary: GCC compiled to run on mips platform ICE's in
                    def_builtin_1 ()
           Product: gcc
           Version: 4.5.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: raj dot khem at gmail dot com
 GCC build triplet: x86_64-linux
  GCC host triplet: x86_64-linux
GCC target triplet: mips-oe-linux-uclibc


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44734