return ppc64.REG_V0 + n, true
		}
	case "F":
		if 0 <= n && n <= 31 {
			return ppc64.REG_F0 + n, true
		}
	case "R":
		if 0 <= n && n <= 31 {
			return ppc64.REG_R0 + n, true
		}
	case "SPR":
		if 0 <= n && n <= 1024 {
			return ppc64.REG_SPR0 + n, true
		}
	}
	return 0, false

	// Map of instruction names to enumeration.
	Instructions map[string]obj.As
	// Map of register names to enumeration.
	Register map[string]int16
	// Table of register prefix names. These are things like R for R(0) and SPR for SPR(268).
	RegisterPrefix map[string]bool
	// RegisterNumber converts R(10) into arm.REG_R10.
	RegisterNumber func(string, int16) (int16, bool)
	// Instruction is a jump.
	IsJump func(word string) bool
}

	BC $16,CR0LT,0(PC)              // 42000000
	BCL $16,CR0LT,0(PC)             // 42000001
	BC $18,CR0LT,0(PC)              // 42400000

	MOVD SPR(3), 4(R1)              // 7fe302a6fbe10004
	MOVD XER, 4(R1)                 // 7fe102a6fbe10004
	MOVD 4(R1), SPR(3)              // ebe100047fe303a6
	MOVD 4(R1), XER                 // ebe100047fe103a6
	OR $0, R0, R0                   // 60000000

	PCALIGN $16