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Current Path: /opt/golang/1.17.2/src/math

📁 ..
📄 abs.go(363 B)
📄 acos_s390x.s(3.73 KB)
📄 acosh.go(1.71 KB)
📄 acosh_s390x.s(4.32 KB)
📄 all_test.go(85.27 KB)
📄 arith_s390x.go(3.73 KB)
📄 arith_s390x_test.go(10.78 KB)
📄 asin.go(1.08 KB)
📄 asin_s390x.s(4.16 KB)
📄 asinh.go(1.92 KB)
📄 asinh_s390x.s(5.74 KB)
📄 atan.go(3.03 KB)
📄 atan2.go(1.52 KB)
📄 atan2_s390x.s(6.93 KB)
📄 atan_s390x.s(3.69 KB)
📄 atanh.go(1.99 KB)
📄 atanh_s390x.s(5.36 KB)
📁 big
📁 bits
📄 bits.go(1.87 KB)
📄 cbrt.go(2.31 KB)
📄 cbrt_s390x.s(4.89 KB)
📁 cmplx
📄 const.go(2.33 KB)
📄 const_test.go(1.29 KB)
📄 copysign.go(378 B)
📄 cosh_s390x.s(5.59 KB)
📄 dim.go(1.68 KB)
📄 dim_amd64.s(1.92 KB)
📄 dim_arm64.s(963 B)
📄 dim_asm.go(380 B)
📄 dim_noasm.go(450 B)
📄 dim_riscv64.s(1.16 KB)
📄 dim_s390x.s(1.97 KB)
📄 erf.go(11.5 KB)
📄 erf_s390x.s(8.5 KB)
📄 erfc_s390x.s(14.4 KB)
📄 erfinv.go(3.36 KB)
📄 example_test.go(3.66 KB)
📄 exp.go(5.37 KB)
📄 exp2_asm.go(268 B)
📄 exp2_noasm.go(301 B)
📄 exp_amd64.go(277 B)
📄 exp_amd64.s(4.24 KB)
📄 exp_arm64.s(5.36 KB)
📄 exp_asm.go(296 B)
📄 exp_noasm.go(333 B)
📄 exp_s390x.s(4.65 KB)
📄 expm1.go(7.9 KB)
📄 expm1_s390x.s(5.29 KB)
📄 export_s390x_test.go(732 B)
📄 export_test.go(357 B)
📄 floor.go(3.28 KB)
📄 floor_386.s(1.47 KB)
📄 floor_amd64.s(2 KB)
📄 floor_arm64.s(573 B)
📄 floor_asm.go(482 B)
📄 floor_noasm.go(589 B)
📄 floor_ppc64x.s(523 B)
📄 floor_s390x.s(579 B)
📄 floor_wasm.s(459 B)
📄 fma.go(4.46 KB)
📄 frexp.go(926 B)
📄 gamma.go(5.52 KB)
📄 huge_test.go(2.56 KB)
📄 hypot.go(845 B)
📄 hypot_386.s(1.81 KB)
📄 hypot_amd64.s(1.05 KB)
📄 hypot_asm.go(284 B)
📄 hypot_noasm.go(319 B)
📄 j0.go(13.6 KB)
📄 j1.go(13.3 KB)
📄 jn.go(7.17 KB)
📄 ldexp.go(1.05 KB)
📄 lgamma.go(11.02 KB)
📄 log.go(3.86 KB)
📄 log10.go(869 B)
📄 log10_s390x.s(4.73 KB)
📄 log1p.go(6.34 KB)
📄 log1p_s390x.s(5.15 KB)
📄 log_amd64.s(3.67 KB)
📄 log_asm.go(281 B)
📄 log_s390x.s(4.31 KB)
📄 log_stub.go(316 B)
📄 logb.go(1014 B)
📄 mod.go(900 B)
📄 modf.go(910 B)
📄 modf_arm64.s(447 B)
📄 modf_asm.go(322 B)
📄 modf_noasm.go(359 B)
📄 modf_ppc64x.s(440 B)
📄 nextafter.go(1.2 KB)
📄 pow.go(3.22 KB)
📄 pow10.go(1.24 KB)
📄 pow_s390x.s(16.27 KB)
📁 rand
📄 remainder.go(2.04 KB)
📄 signbit.go(302 B)
📄 sin.go(6.35 KB)
📄 sin_s390x.s(8.34 KB)
📄 sincos.go(1.75 KB)
📄 sinh.go(1.69 KB)
📄 sinh_s390x.s(5.98 KB)
📄 sqrt.go(4.9 KB)
📄 sqrt_386.s(304 B)
📄 sqrt_amd64.s(334 B)
📄 sqrt_arm.s(529 B)
📄 sqrt_arm64.s(310 B)
📄 sqrt_asm.go(416 B)
📄 sqrt_mipsx.s(409 B)
📄 sqrt_noasm.go(469 B)
📄 sqrt_ppc64x.s(362 B)
📄 sqrt_riscv64.s(308 B)
📄 sqrt_s390x.s(309 B)
📄 sqrt_wasm.s(273 B)
📄 stubs.go(2.59 KB)
📄 stubs_s390x.s(12.38 KB)
📄 tan.go(3.67 KB)
📄 tan_s390x.s(2.73 KB)
📄 tanh.go(2.65 KB)
📄 tanh_s390x.s(4.57 KB)
📄 trig_reduce.go(3.33 KB)
📄 unsafe.go(1.27 KB)

Editing: atanh.go

// Copyright 2010 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.

package math

// The original C code, the long comment, and the constants
// below are from FreeBSD's /usr/src/lib/msun/src/e_atanh.c
// and came with this notice. The go code is a simplified
// version of the original C.
//
// ====================================================
// Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
//
// Developed at SunPro, a Sun Microsystems, Inc. business.
// Permission to use, copy, modify, and distribute this
// software is freely granted, provided that this notice
// is preserved.
// ====================================================
//
//
// __ieee754_atanh(x)
// Method :
//	1. Reduce x to positive by atanh(-x) = -atanh(x)
//	2. For x>=0.5
//	            1              2x                          x
//	atanh(x) = --- * log(1 + -------) = 0.5 * log1p(2 * --------)
//	            2             1 - x                      1 - x
//
//	For x<0.5
//	atanh(x) = 0.5*log1p(2x+2x*x/(1-x))
//
// Special cases:
//	atanh(x) is NaN if |x| > 1 with signal;
//	atanh(NaN) is that NaN with no signal;
//	atanh(+-1) is +-INF with signal.
//

// Atanh returns the inverse hyperbolic tangent of x.
//
// Special cases are:
//	Atanh(1) = +Inf
//	Atanh(±0) = ±0
//	Atanh(-1) = -Inf
//	Atanh(x) = NaN if x < -1 or x > 1
//	Atanh(NaN) = NaN
func Atanh(x float64) float64 {
	if haveArchAtanh {
		return archAtanh(x)
	}
	return atanh(x)
}

func atanh(x float64) float64 {
	const NearZero = 1.0 / (1 << 28) // 2**-28
	// special cases
	switch {
	case x < -1 || x > 1 || IsNaN(x):
		return NaN()
	case x == 1:
		return Inf(1)
	case x == -1:
		return Inf(-1)
	}
	sign := false
	if x < 0 {
		x = -x
		sign = true
	}
	var temp float64
	switch {
	case x < NearZero:
		temp = x
	case x < 0.5:
		temp = x + x
		temp = 0.5 * Log1p(temp+temp*x/(1-x))
	default:
		temp = 0.5 * Log1p((x+x)/(1-x))
	}
	if sign {
		temp = -temp
	}
	return temp
}

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Editing: atanh.go

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