} else if p.As == ABFC { // only "BFC $width, $lsb, Reg" is accepted, p.Reg must be 0
			c.ctxt.Diag("illegal combination: %v", p)
		}
		if p.GetFrom3() == nil || p.GetFrom3().Type != obj.TYPE_CONST {
			c.ctxt.Diag("%v: missing or wrong LSB", p)
			break
		}
		lsb := p.GetFrom3().Offset
		width := p.From.Offset
		if lsb < 0 || lsb > 31 || width <= 0 || (lsb+width) > 32 {
			c.ctxt.Diag("%v: wrong width or LSB", p)
		}

			p.AddRestSourceReg(v.Args[1].Reg())
		} else {
			p.AddRestSourceReg(ppc64.REG_R0)
		}
		// AuxInt values 4,5,6 implemented with reverse operand order from 0,1,2
		if v.AuxInt > 3 {
			p.Reg, p.GetFrom3().Reg = p.GetFrom3().Reg, p.Reg
		}
		p.From.SetConst(v.AuxInt & 3)

	case ssa.OpPPC64SETBC, ssa.OpPPC64SETBCR:
		p := s.Prog(v.Op.Asm())
		p.To.Type = obj.TYPE_REG
		p.To.Reg = v.Reg()