error compiling libgcc with ported cross-compiler

["Tomas Svensson" <idulus at gmail dot com>]

I am porting gcc to a new target architecture, and have come across a
problem when the make process tries to compile libgcc. The error I get
is included below.

It seems that gcc has emitted rtl describing a memory reference (mem
(plus (mem (plus (reg ..) (const_int ..))) (const_int ..))), which
should not have been permitted by GO_IF_LEGITIMATE_ADDRESS since it
only allows (mem (plus (reg ..) (const ..))), and forbids a second
level of memory reference.

I am (obviously) no gcc-expert by far, and have no idea how to tackle
this problem. Has anyone had a similar problem, or any pointers as to
how I can solve it?

The error message is:

/cygdrive/c/home/risc/src/gcc-4.1.2/gcc/libgcc2.c: In function '__powidf2':
/cygdrive/c/home/risc/src/gcc-4.1.2/gcc/libgcc2.c:1559: error: insn
does not satisfy its constraints:
(insn 114 153 117
/cygdrive/c/home/risc/src/gcc-4.1.2/gcc/libgcc2.c:1558 (set
(mem/c/i:SI (plus:SI (mem/f/c:SI (plus:SI (reg/f:SI 29 r29)
                        (const_int -52 [0xffffffcc])) [0 D.2153+0 S4 A8])
                (const_int 4 [0x4])) [0 <result>+4 S4 A8])
        (reg:SI 1 r1)) 3 {*movsi_internal} (nil)
    (nil))
/cygdrive/c/home/risc/src/gcc-4.1.2/gcc/libgcc2.c:1559: internal
compiler error: in final_scan_insn, at final.c:2410
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
make[3]: *** [libgcc/./_powidf2.o] Error 1
make[3]: Leaving directory `/cygdrive/c/home/risc/build/gcc/gcc'