case AVSLB:
		return OPVX(4, 260, 0, 0) /* vslh - v2.03 */
	case AVSLH:
		return OPVX(4, 324, 0, 0) /* vslh - v2.03 */
	case AVSLW:
		return OPVX(4, 388, 0, 0) /* vslw - v2.03 */
	case AVSL:
		return OPVX(4, 452, 0, 0) /* vsl - v2.03 */
	case AVSLO:
		return OPVX(4, 1036, 0, 0) /* vsl - v2.03 */
	case AVSRB:
		return OPVX(4, 516, 0, 0) /* vsrb - v2.03 */
	case AVSRH:
		return OPVX(4, 580, 0, 0) /* vsrh - v2.03 */

			ctxt.Diag("unsupported SAE: %v", p)
		}
		evexB = 1
	}
	if rm != nil && regrex[rm.Index]&RxrEvex != 0 {
		evexV = 0
	} else if v != nil && regrex[v.Reg]&RxrEvex != 0 {
		evexV = 0 // VSR selector 5th bit.
	}
	if k != nil {
		evexA = byte(reg[k.Reg])
	}
	// P2 = [z][L'L][b][V'][aaa]
	p2 := (evexZ << 7) |
		(evexLL << 5) |
		(evexB << 4) |
		(evexV << 3) |
		(evexA << 0)

		rt := int((p.To.Reg) & 31)
		r := int((p.Reg) & 31)

		o1 |= ((Q & 1) << 30) | (uint32(r&31) << 16) | (uint32(index&15) << 11) | (uint32(rf&31) << 5) | uint32(rt&31)

	case 95: /* vushr/vshl/vsri/vsli/vusra $shift, Vn.<T>, Vd.<T> */
		at := int((p.To.Reg >> 5) & 15)
		af := int((p.Reg >> 5) & 15)
		shift := int(p.From.Offset)

		if af != at {