// and then assume mask=f during matching.
	const condMask = 0xf0000000
	xNoCond := x
	if x&condMask != condMask {
		xNoCond &^= condMask
	}
	var priority int8
Search:
	for i := range instFormats {
		f := &instFormats[i]
		if xNoCond&(f.mask|condMask) != f.value || f.priority <= priority {
			continue
		}
		delta := uint32(0)
		deltaShift := uint(0)