// license that can be found in the LICENSE file.

package math

// Log10 returns the decimal logarithm of x.
// The special cases are the same as for [Log].
func Log10(x float64) float64 {
	if haveArchLog10 {
		return archLog10(x)
	}
	return log10(x)
}

func log10(x float64) float64 {
	return Log(x) * (1 / Ln10)
}

// Log2 returns the binary logarithm of x.
// The special cases are the same as for [Log].

	panic("not implemented")
}

const haveArchLog10 = false

func archLog10(x float64) float64 {
	panic("not implemented")
}

const haveArchLog2 = false

func archLog2(x float64) float64 {
	panic("not implemented")
}

const haveArchLog1p = false

func archLog1p(x float64) float64 {
	panic("not implemented")
}

const haveArchMod = false

func logTrampolineSetup(x float64) float64
func logAsm(x float64) float64

// Below here all functions are grouped in stubs.go for other
// architectures.

const haveArchLog10 = true

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

// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

#include "textflag.h"

TEXT ·archLog10(SB), NOSPLIT, $0
	MOVD ·log10vectorfacility+0x00(SB), R1
	BR   (R1)

TEXT ·log10TrampolineSetup(SB), NOSPLIT, $0
	MOVB   ·hasVX(SB), R1
	CMPBEQ R1, $1, vectorimpl                 // vectorfacility = 1, vector supported

//
// Special cases are:
//
//	Log1p(+Inf) = +Inf
//	Log1p(±0) = ±0
//	Log1p(-1) = -Inf
//	Log1p(x < -1) = NaN
//	Log1p(NaN) = NaN
func Log1p(x float64) float64 {
	if haveArchLog1p {
		return archLog1p(x)
	}
	return log1p(x)
}

func log1p(x float64) float64 {
	const (
		Sqrt2M1     = 4.142135623730950488017e-01  // Sqrt(2)-1 = 0x3fda827999fcef34