z += int(yt.zoffset) + xo
		} else {
			if p.Scond != 0 && !evexZcase(yt.zcase) {
				// Do not signal error and continue to search
				// for matching EVEX-encoded form.
				z += int(yt.zoffset)
				continue
			}

			switch o.prefix {
			case Px1: // first option valid only in 32-bit mode
				if ctxt.Arch.Family == sys.AMD64 && z == 0 {
					z += int(yt.zoffset) + xo
					continue
				}