low_sign_unext
stub->insns[0] |= low_sign_unext(d, 5) << 16;
hppa_t10_insn(0x03, b, low_sign_unext(im5,5), 0, 1<<2, 3<<1, target)
hppa_t10_insn(0x03, b, src, 0, 1<<2, 0xB<<1, low_sign_unext(im5,5))
return ((opcode << 26) | (r << 21) | (t << 16) | low_sign_unext(im11, 11));