return OPVCC(31, 407, 0, 0) /* sthx */
	case AMOVHBR:
		return OPVCC(31, 918, 0, 0) /* sthbrx */

	case AMOVHZU, AMOVHU:
		return OPVCC(31, 439, 0, 0) /* sthux */

	case AMOVWZ, AMOVW:
		return OPVCC(31, 151, 0, 0) /* stwx */

	case AMOVWZU, AMOVWU:
		return OPVCC(31, 183, 0, 0) /* stwux */
	case ASTSW:
		return OPVCC(31, 661, 0, 0) /* stswx */
	case AMOVWBR:

//
//	semacquire(&worldsema, 0)
//	m.preemptoff = "reason"
//	var stw worldStop
//	systemstack(func() {
//		stw = stopTheWorldWithSema(reason)
//	})
//
// When finished, the caller must either call startTheWorld or undo
// these three operations separately:
//
//	m.preemptoff = ""
//	systemstack(func() {
//		now = startTheWorldWithSema(stw)
//	})
//	semrelease(&worldsema)
//