MOVD	R6, R5		// R5 = byte
	BR	indexbytebody<>(SB)

TEXT ·IndexByteString<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-32
	// R3 = string
	// R4 = length
	// R5 = byte
	BR	indexbytebody<>(SB)

#ifndef GOPPC64_power9
#ifdef GOARCH_ppc64le
DATA indexbytevbperm<>+0(SB)/8, $0x3830282018100800
DATA indexbytevbperm<>+8(SB)/8, $0x7870686058504840
#else
DATA indexbytevbperm<>+0(SB)/8, $0x0008101820283038

#ifdef  GOARCH_ppc64le
#define _LDBEX	MOVDBR
#define _LWBEX	MOVWBR
#define _LHBEX	MOVHBR
#else
#define _LDBEX	MOVD
#define _LWBEX	MOVW
#define _LHBEX	MOVH
#endif

#ifdef GOPPC64_power9
#define SETB_CR0(rout) SETB CR0, rout
#define SETB_CR1(rout) SETB CR1, rout
#define SETB_INIT()
#define SETB_CR0_NE(rout) SETB_CR0(rout)
#else
// A helper macro to emulate SETB on P8. This assumes

DATA ·rcon+0x38(SB)/8, $0x0d0e0f0c0d0e0f0c // MASK
DATA ·rcon+0x40(SB)/8, $0x0000000000000000
DATA ·rcon+0x48(SB)/8, $0x0000000000000000
GLOBL ·rcon(SB), RODATA, $80

#ifdef GOARCH_ppc64le
#  ifdef GOPPC64_power9
#define P8_LXVB16X(RA,RB,VT)  LXVB16X	(RA+RB), VT
#define P8_STXVB16X(VS,RA,RB) STXVB16X	VS, (RA+RB)
#define XXBRD_ON_LE(VA,VT)    XXBRD	VA, VT
#  else

		switch cfg.GOPPC64 {
		case "power10":
			args = append(args, "-D", "GOPPC64_power10")
			fallthrough
		case "power9":
			args = append(args, "-D", "GOPPC64_power9")
			fallthrough
		default: // This should always be power8.
			args = append(args, "-D", "GOPPC64_power8")
		}
	}

	if cfg.Goarch == "riscv64" {
		// Define GORISCV64_value from cfg.GORISCV64.

#define ESPERM V10
#define TMP2 V11

// The following macros provide appropriate
// implementations for endianness as well as
// ISA specific for power8 and power9.
#ifdef GOARCH_ppc64le
#  ifdef GOPPC64_power9
#define P8_LXVB16X(RA,RB,VT)   LXVB16X (RA)(RB), VT
#define P8_STXVB16X(VS,RA,RB)  STXVB16X VS, (RA)(RB)
#  else
#define NEEDS_ESPERM
#define P8_LXVB16X(RA,RB,VT) \
	LXVD2X  (RA+RB), VT \

		switch goppc64 {
		case "power10":
			asmArgs = append(asmArgs, "-D", "GOPPC64_power10")
			fallthrough
		case "power9":
			asmArgs = append(asmArgs, "-D", "GOPPC64_power9")
			fallthrough
		default: // This should always be power8.
			asmArgs = append(asmArgs, "-D", "GOPPC64_power8")
		}
	}
	if goarch == "riscv64" {
		// Define GORISCV64_value from goriscv64