X4
uwd->X4.qp = (buf[1] & 0x3f);
uwd->X4.x = ((buf[2] & 0x80) == 0x80);
uwd->X4.a = ((buf[2] & 0x40) == 0x40);
uwd->X4.b = ((buf[2] & 0x20) == 0x20);
uwd->X4.reg = (buf[2] & 0x1f);
uwd->X4.y = ((buf[3] & 0x80) == 0x80);
uwd->X4.treg = (buf[3] & 0x7f);
buf = unwind_decode_ule128(buf, &uwd->X4.t);
struct unwind_desc_X4 X4;
case X4:
strc[rec_cnt].type = X4;
case X4:
X4(FSR_UF),
X4(FPE_FLTUND),
X4(FPE_FLTUND_TRAP),
#define X8(x) X4(x),X4(x)