return defaultGOMIPS64
}

func goppc64() int {
	switch v := envOr("GOPPC64", defaultGOPPC64); v {
	case "power8":
		return 8
	case "power9":
		return 9
	case "power10":
		return 10
	}
	Error = fmt.Errorf("invalid GOPPC64: must be power8, power9, power10")
	return int(defaultGOPPC64[len("power")] - '0')
}

func goriscv64() int {

	CMP   R7, $1
	BNE   power8
	BR    indexbodyp9<>(SB)
#endif
power8:
	BR indexbody<>(SB)

TEXT ·IndexString<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-40
	// R3 = string
	// R4 = length
	// R5 = separator pointer
	// R6 = separator length

#ifdef GOARCH_ppc64le
	MOVBZ internal∕cpu·PPC64+const_offsetPPC64HasPOWER9(SB), R7
	CMP   R7, $1
	BNE   power8
	BR    indexbodyp9<>(SB)

#endif
power8:

// at compile-time

func constantConvert32(x float32) float32 {
	// amd64:"MOVSS\t[$]f32.3f800000\\(SB\\)"
	// s390x:"FMOVS\t[$]f32.3f800000\\(SB\\)"
	// ppc64x/power8:"FMOVS\t[$]f32.3f800000\\(SB\\)"
	// ppc64x/power9:"FMOVS\t[$]f32.3f800000\\(SB\\)"
	// ppc64x/power10:"XXSPLTIDP\t[$]1065353216, VS0"
	// arm64:"FMOVS\t[$]\\(1.0\\)"
	if x > math.Float32frombits(0x3f800000) {

	  correspond to the mips64.hardfloat and mips64.softfloat
	  (or mips64le.hardfloat and mips64le.softfloat) feature build tags.
	- For GOARCH=ppc64 or ppc64le,
	  GOPPC64=power8, power9, and power10 correspond to the
	  ppc64.power8, ppc64.power9, and ppc64.power10
	  (or ppc64le.power8, ppc64le.power9, and ppc64le.power10)
	  feature build tags.
	- For GOARCH=riscv64,
	  GORISCV64=rva20u64 and rva22u64 correspond to the riscv64.rva20u64

var PPC64 struct {
	_        CacheLinePad
	HasDARN  bool // Hardware random number generator (requires kernel enablement)
	HasSCV   bool // Syscall vectored (requires kernel enablement)
	IsPOWER8 bool // ISA v2.07 (POWER8)
	IsPOWER9 bool // ISA v3.00 (POWER9), implies IsPOWER8
	_        CacheLinePad
}

// S390X contains the supported CPU features of the current IBM Z
// (s390x) platform. If the current platform is not IBM Z then all

			p.To.Offset = offset
			rem -= size
			offset += size
		}

	case ssa.OpPPC64LoweredZero, ssa.OpPPC64LoweredZeroShort:

		// Unaligned data doesn't hurt performance
		// for these instructions on power8.

		// For sizes >= 64 generate a loop as follows:

		// Set up loop counter in CTR, used by BC
		//       XXLXOR VS32,VS32,VS32
		//	 MOVD len/32,REG_TMP
		//	 MOVD REG_TMP,CTR

		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.
		args = append(args, "-D", "GORISCV64_"+cfg.GORISCV64)
	}

#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
// On POWER8/ppc64le, emulate the POWER9 instructions by loading unaligned
// doublewords and byte-swapping each doubleword to emulate BE load/stores.
#define NEEDS_ESPERM
#define P8_LXVB16X(RA,RB,VT) \
	LXVD2X	(RA+RB), VT \

	if b == "" {
		b = "hardfloat"
	}
	gomips = b

	b = os.Getenv("GOMIPS64")
	if b == "" {
		b = "hardfloat"
	}
	gomips64 = b

	b = os.Getenv("GOPPC64")
	if b == "" {
		b = "power8"
	}
	goppc64 = b

	b = os.Getenv("GORISCV64")
	if b == "" {
		b = "rva20u64"
	}
	goriscv64 = b

	if p := pathf("%s/src/all.bash", goroot); !isfile(p) {

		"arm64":   {"GOARM64", "v8.0", "v8.1"},
		"loong64": {},
		"mips":    {"GOMIPS", "hardfloat", "softfloat"},
		"mips64":  {"GOMIPS64", "hardfloat", "softfloat"},
		"ppc64":   {"GOPPC64", "power8", "power9", "power10"},
		"ppc64le": {"GOPPC64", "power8", "power9", "power10"},
		"ppc64x":  {}, // A pseudo-arch representing both ppc64 and ppc64le
		"s390x":   {},
		"wasm":    {},
		"riscv64": {"GORISCV64", "rva20u64", "rva22u64"},
	}