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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: cbrt.go

// Copyright 2009 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 go code is a modified version of the original C code from
// http://www.netlib.org/fdlibm/s_cbrt.c and came with this notice.
//
// ====================================================
// Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
//
// Developed at SunSoft, a Sun Microsystems, Inc. business.
// Permission to use, copy, modify, and distribute this
// software is freely granted, provided that this notice
// is preserved.
// ====================================================

// Cbrt returns the cube root of x.
//
// Special cases are:
//	Cbrt(±0) = ±0
//	Cbrt(±Inf) = ±Inf
//	Cbrt(NaN) = NaN
func Cbrt(x float64) float64 {
	if haveArchCbrt {
		return archCbrt(x)
	}
	return cbrt(x)
}

func cbrt(x float64) float64 {
	const (
		B1             = 715094163                   // (682-0.03306235651)*2**20
		B2             = 696219795                   // (664-0.03306235651)*2**20
		C              = 5.42857142857142815906e-01  // 19/35     = 0x3FE15F15F15F15F1
		D              = -7.05306122448979611050e-01 // -864/1225 = 0xBFE691DE2532C834
		E              = 1.41428571428571436819e+00  // 99/70     = 0x3FF6A0EA0EA0EA0F
		F              = 1.60714285714285720630e+00  // 45/28     = 0x3FF9B6DB6DB6DB6E
		G              = 3.57142857142857150787e-01  // 5/14      = 0x3FD6DB6DB6DB6DB7
		SmallestNormal = 2.22507385850720138309e-308 // 2**-1022  = 0x0010000000000000
	)
	// special cases
	switch {
	case x == 0 || IsNaN(x) || IsInf(x, 0):
		return x
	}

sign := false
	if x < 0 {
		x = -x
		sign = true
	}

// rough cbrt to 5 bits
	t := Float64frombits(Float64bits(x)/3 + B1<<32)
	if x < SmallestNormal {
		// subnormal number
		t = float64(1 << 54) // set t= 2**54
		t *= x
		t = Float64frombits(Float64bits(t)/3 + B2<<32)
	}

// new cbrt to 23 bits
	r := t * t / x
	s := C + r*t
	t *= G + F/(s+E+D/s)

// chop to 22 bits, make larger than cbrt(x)
	t = Float64frombits(Float64bits(t)&(0xFFFFFFFFC<<28) + 1<<30)

// one step newton iteration to 53 bits with error less than 0.667ulps
	s = t * t // t*t is exact
	r = x / s
	w := t + t
	r = (r - t) / (w + r) // r-s is exact
	t = t + t*r

// restore the sign bit
	if sign {
		t = -t
	}
	return t
}

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Editing: cbrt.go

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