}

const haveArchCbrt = false

func archCbrt(x float64) float64 {
	panic("not implemented")
}

const haveArchCos = false

func archCos(x float64) float64 {
	panic("not implemented")
}

const haveArchCosh = false

func archCosh(x float64) float64 {
	panic("not implemented")
}

const haveArchErf = false

func archErf(x float64) float64 {
	panic("not implemented")
}

}

// Cosh returns the hyperbolic cosine of x.
//
// Special cases are:
//
//	Cosh(±0) = 1
//	Cosh(±Inf) = +Inf
//	Cosh(NaN) = NaN
func Cosh(x float64) float64 {
	if haveArchCosh {
		return archCosh(x)
	}
	return cosh(x)
}

func cosh(x float64) float64 {
	x = Abs(x)
	if x > 21 {
		return Exp(x) * 0.5
	}
	ex := Exp(x)
	return (ex + 1/ex) * 0.5

func archLog10(x float64) float64
func log10TrampolineSetup(x float64) float64
func log10Asm(x float64) float64

const haveArchCos = true

func archCos(x float64) float64
func cosTrampolineSetup(x float64) float64
func cosAsm(x float64) float64

const haveArchCosh = true

func archCosh(x float64) float64
func coshTrampolineSetup(x float64) float64
func coshAsm(x float64) float64

const haveArchSin = true

	MOVD $·cosvectorfacility+0x00(SB), R1
	MOVD $·cosAsm(SB), R2
	MOVD R2, 0(R1)
	BR   ·cosAsm(SB)

GLOBL ·cosvectorfacility+0x00(SB), NOPTR, $8
DATA ·cosvectorfacility+0x00(SB)/8, $·cosTrampolineSetup(SB)

TEXT ·archCosh(SB), NOSPLIT, $0
	MOVD ·coshvectorfacility+0x00(SB), R1
	BR   (R1)

TEXT ·coshTrampolineSetup(SB), NOSPLIT, $0
	MOVB   ·hasVX(SB), R1
	CMPBEQ R1, $1, vectorimpl                // vectorfacility = 1, vector supported

// Acosh returns the inverse hyperbolic cosine of x.
//
// Special cases are:
//
//	Acosh(+Inf) = +Inf
//	Acosh(x) = NaN if x < 1
//	Acosh(NaN) = NaN
func Acosh(x float64) float64 {
	if haveArchAcosh {
		return archAcosh(x)
	}
	return acosh(x)
}

func acosh(x float64) float64 {
	const Large = 1 << 28 // 2**28
	// first case is special case
	switch {
	case x < 1 || IsNaN(x):
		return NaN()
	case x == 1:
		return 0

}

// Cos returns the cosine of the radian argument x.
//
// Special cases are:
//
//	Cos(±Inf) = NaN
//	Cos(NaN) = NaN
func Cos(x float64) float64 {
	if haveArchCos {
		return archCos(x)
	}
	return cos(x)
}

func cos(x float64) float64 {
	const (
		PI4A = 7.85398125648498535156e-1  // 0x3fe921fb40000000, Pi/4 split into three parts