// nicked from output of PGC Rel 1.4 -opt 2
        .text
        .align  8
        .text

#define trace_regs(label)\
adds -16, sp, sp;  \
st.l r1, 4(sp);   \
adds -256, sp, sp; \
st.l r17, 64(sp);  \
orh ha%label, r0, r17; \
or  l%label, r17, r17; \
call _reg_dump;   \
adds 256, sp, sp; \
ld.l 4(sp), r1;   \
adds 16, sp, sp