RTL error for member access

[blackoil]

/home/abcde/gccsrc/libgcc/unwind-dw2-fde.c: In function ‘frame_heapsort’:
/home/abcde/gccsrc/libgcc/unwind-dw2-fde.c:537:1: error: insn does not
satisfy its constraints:
(insn 48 47 163 2 (set (reg:SI 4 X4)
        (mem:SI (plus:SI (mem/f/c:SI (plus:SI (reg/f:SI 22 FP)
                        (const_int 16 [0x10])) [6 erratic+0 S4 A32])
                (const_int 4 [0x4])) [4 erratic_3(D)->count+0 S4 A32]))
/home/abcde/gccsrc/libgcc/unwind-dw2-fde.c:519 3 {load_store_si}
     (nil))
/home/abcde/gccsrc/libgcc/unwind-dw2-fde.c:537:1: internal compiler error:
in reload_cse_simplify_operands, at postreload.c:403


I tried own test code, it works fine.

struct new
{
int a;
int b;
};

int main(struct new * p)
{
p->b = 123;
}



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