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02/02/2024 06:09:55 PM
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abs.go
366 bytes
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acos_s390x.s
3.73 KB
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acosh.go
1.71 KB
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acosh_s390x.s
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all_test.go
86.77 KB
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arith_s390x.go
3.73 KB
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arith_s390x_test.go
10.78 KB
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asin.go
1.09 KB
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asin_s390x.s
4.16 KB
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asinh.go
1.92 KB
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asinh_s390x.s
5.74 KB
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atan.go
3.03 KB
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atan2.go
1.52 KB
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atan2_s390x.s
6.93 KB
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atan_s390x.s
3.69 KB
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atanh.go
1.99 KB
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atanh_s390x.s
5.06 KB
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big
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bits
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bits.go
1.87 KB
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cbrt.go
2.31 KB
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cbrt_s390x.s
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cmplx
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const.go
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const_test.go
1.29 KB
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copysign.go
396 bytes
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cosh_s390x.s
5.59 KB
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dim.go
1.87 KB
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dim_amd64.s
1.92 KB
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dim_arm64.s
963 bytes
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dim_asm.go
344 bytes
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dim_noasm.go
410 bytes
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dim_riscv64.s
1.16 KB
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dim_s390x.s
1.97 KB
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erf.go
11.51 KB
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erf_s390x.s
8.5 KB
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erfc_s390x.s
14.4 KB
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erfinv.go
3.37 KB
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example_test.go
3.75 KB
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exp.go
5.38 KB
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exp2_asm.go
252 bytes
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exp2_noasm.go
284 bytes
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exp_amd64.go
261 bytes
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exp_amd64.s
4.24 KB
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exp_arm64.s
5.36 KB
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exp_asm.go
268 bytes
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exp_noasm.go
302 bytes
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exp_s390x.s
4.65 KB
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expm1.go
7.91 KB
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expm1_s390x.s
5.29 KB
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export_s390x_test.go
732 bytes
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export_test.go
357 bytes
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floor.go
3.29 KB
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floor_386.s
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floor_amd64.s
2 KB
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floor_arm64.s
573 bytes
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floor_asm.go
431 bytes
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floor_noasm.go
531 bytes
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floor_ppc64x.s
499 bytes
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floor_s390x.s
579 bytes
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floor_wasm.s
459 bytes
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fma.go
4.61 KB
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frexp.go
929 bytes
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gamma.go
5.53 KB
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huge_test.go
2.91 KB
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hypot.go
850 bytes
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hypot_386.s
1.81 KB
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hypot_amd64.s
1.05 KB
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hypot_asm.go
264 bytes
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hypot_noasm.go
297 bytes
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j0.go
13.6 KB
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j1.go
13.3 KB
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jn.go
7.18 KB
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ldexp.go
1.05 KB
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lgamma.go
11.03 KB
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log.go
3.86 KB
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log10.go
873 bytes
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log10_s390x.s
4.73 KB
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log1p.go
6.34 KB
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log1p_s390x.s
5.15 KB
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log_amd64.s
3.66 KB
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log_asm.go
259 bytes
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log_s390x.s
4.31 KB
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log_stub.go
292 bytes
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logb.go
1021 bytes
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mod.go
903 bytes
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modf.go
913 bytes
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modf_arm64.s
447 bytes
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modf_asm.go
292 bytes
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modf_noasm.go
326 bytes
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modf_ppc64x.s
416 bytes
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nextafter.go
1.21 KB
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pow.go
3.65 KB
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pow10.go
1.24 KB
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pow_s390x.s
16.27 KB
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rand
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02/02/2024 06:09:55 PM
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remainder.go
2.04 KB
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signbit.go
302 bytes
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sin.go
6.35 KB
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sin_s390x.s
8.57 KB
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sincos.go
1.76 KB
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sinh.go
1.69 KB
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sinh_s390x.s
5.98 KB
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sqrt.go
4.75 KB
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stubs.go
2.57 KB
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stubs_s390x.s
12.38 KB
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tan.go
3.68 KB
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tan_s390x.s
2.72 KB
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tanh.go
2.66 KB
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tanh_s390x.s
4.57 KB
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trig_reduce.go
3.34 KB
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unsafe.go
1.27 KB
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Editing: pow.go
Close
// 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 func isOddInt(x float64) bool { if Abs(x) >= (1 << 53) { // 1 << 53 is the largest exact integer in the float64 format. // Any number outside this range will be truncated before the decimal point and therefore will always be // an even integer. // Without this check and if x overflows int64 the int64(xi) conversion below may produce incorrect results // on some architectures (and does so on arm64). See issue #57465. return false } xi, xf := Modf(x) return xf == 0 && int64(xi)&1 == 1 } // Special cases taken from FreeBSD's /usr/src/lib/msun/src/e_pow.c // updated by IEEE Std. 754-2008 "Section 9.2.1 Special values". // Pow returns x**y, the base-x exponential of y. // // Special cases are (in order): // // Pow(x, ±0) = 1 for any x // Pow(1, y) = 1 for any y // Pow(x, 1) = x for any x // Pow(NaN, y) = NaN // Pow(x, NaN) = NaN // Pow(±0, y) = ±Inf for y an odd integer < 0 // Pow(±0, -Inf) = +Inf // Pow(±0, +Inf) = +0 // Pow(±0, y) = +Inf for finite y < 0 and not an odd integer // Pow(±0, y) = ±0 for y an odd integer > 0 // Pow(±0, y) = +0 for finite y > 0 and not an odd integer // Pow(-1, ±Inf) = 1 // Pow(x, +Inf) = +Inf for |x| > 1 // Pow(x, -Inf) = +0 for |x| > 1 // Pow(x, +Inf) = +0 for |x| < 1 // Pow(x, -Inf) = +Inf for |x| < 1 // Pow(+Inf, y) = +Inf for y > 0 // Pow(+Inf, y) = +0 for y < 0 // Pow(-Inf, y) = Pow(-0, -y) // Pow(x, y) = NaN for finite x < 0 and finite non-integer y func Pow(x, y float64) float64 { if haveArchPow { return archPow(x, y) } return pow(x, y) } func pow(x, y float64) float64 { switch { case y == 0 || x == 1: return 1 case y == 1: return x case IsNaN(x) || IsNaN(y): return NaN() case x == 0: switch { case y < 0: if Signbit(x) && isOddInt(y) { return Inf(-1) } return Inf(1) case y > 0: if Signbit(x) && isOddInt(y) { return x } return 0 } case IsInf(y, 0): switch { case x == -1: return 1 case (Abs(x) < 1) == IsInf(y, 1): return 0 default: return Inf(1) } case IsInf(x, 0): if IsInf(x, -1) { return Pow(1/x, -y) // Pow(-0, -y) } switch { case y < 0: return 0 case y > 0: return Inf(1) } case y == 0.5: return Sqrt(x) case y == -0.5: return 1 / Sqrt(x) } yi, yf := Modf(Abs(y)) if yf != 0 && x < 0 { return NaN() } if yi >= 1<<63 { // yi is a large even int that will lead to overflow (or underflow to 0) // for all x except -1 (x == 1 was handled earlier) switch { case x == -1: return 1 case (Abs(x) < 1) == (y > 0): return 0 default: return Inf(1) } } // ans = a1 * 2**ae (= 1 for now). a1 := 1.0 ae := 0 // ans *= x**yf if yf != 0 { if yf > 0.5 { yf-- yi++ } a1 = Exp(yf * Log(x)) } // ans *= x**yi // by multiplying in successive squarings // of x according to bits of yi. // accumulate powers of two into exp. x1, xe := Frexp(x) for i := int64(yi); i != 0; i >>= 1 { if xe < -1<<12 || 1<<12 < xe { // catch xe before it overflows the left shift below // Since i !=0 it has at least one bit still set, so ae will accumulate xe // on at least one more iteration, ae += xe is a lower bound on ae // the lower bound on ae exceeds the size of a float64 exp // so the final call to Ldexp will produce under/overflow (0/Inf) ae += xe break } if i&1 == 1 { a1 *= x1 ae += xe } x1 *= x1 xe <<= 1 if x1 < .5 { x1 += x1 xe-- } } // ans = a1*2**ae // if y < 0 { ans = 1 / ans } // but in the opposite order if y < 0 { a1 = 1 / a1 ae = -ae } return Ldexp(a1, ae) }