return patterns;
}

double GpuHardware::GetHardwareSwitchingCost(const TargetHardware* from,
                                             size_t buffer_size) const {
  auto from_type = from->GetTypeId();
  auto to_type = GetTypeId();
  if (from_type == to_type) return 0.0f;

  // TODO(renjieliu): Implement a better version for different hardware cases.
  return buffer_size * kCrossHardwareTransferPerByteCost / 8.0 +

type AddrPos struct {
	Addr
	Pos OperandPos
}

type OperandPos int8

const (
	Source OperandPos = iota
	Destination
)

// From3Type returns p.GetFrom3().Type, or TYPE_NONE when
// p.GetFrom3() returns nil.
func (p *Prog) From3Type() AddrType {
	from3 := p.GetFrom3()
	if from3 == nil {
		return TYPE_NONE
	}
	return from3.Type
}

		} else if p.From3Type() == obj.TYPE_CONST {
			/* imm imm reg reg */
			/* operand order: SIX, VRA, ST, VRT */
			six := int(c.regoff(&p.From))
			st := int(c.regoff(p.GetFrom3()))
			o1 = AOP_IIRR(c.opiirr(p.As), uint32(p.To.Reg), uint32(p.Reg), uint32(st), uint32(six))
		} else if p.From3Type() == obj.TYPE_NONE && p.Reg != 0 {
			/* imm reg reg */

		cond := SpecialOperand(p.From.Offset)
		if cond < SPOP_EQ || cond > SPOP_NV || (cond == SPOP_AL || cond == SPOP_NV) && p.From3Type() == obj.TYPE_NONE {
			c.ctxt.Diag("invalid condition: %v", p)
		} else {
			cond -= SPOP_EQ
		}

		r := int(p.Reg)
		var rf int = r
		if p.From3Type() == obj.TYPE_NONE {
			/* CINC/CINV/CNEG or CSET/CSETM*/
			if r == obj.REG_NONE {
				/* CSET/CSETM */