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abs.go
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sin.go
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trig_reduce.go
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unsafe.go
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Code Editor : floor.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 // Floor returns the greatest integer value less than or equal to x. // // Special cases are: // Floor(±0) = ±0 // Floor(±Inf) = ±Inf // Floor(NaN) = NaN func Floor(x float64) float64 func floor(x float64) float64 { if x == 0 || IsNaN(x) || IsInf(x, 0) { return x } if x < 0 { d, fract := Modf(-x) if fract != 0.0 { d = d + 1 } return -d } d, _ := Modf(x) return d } // Ceil returns the least integer value greater than or equal to x. // // Special cases are: // Ceil(±0) = ±0 // Ceil(±Inf) = ±Inf // Ceil(NaN) = NaN func Ceil(x float64) float64 func ceil(x float64) float64 { return -Floor(-x) } // Trunc returns the integer value of x. // // Special cases are: // Trunc(±0) = ±0 // Trunc(±Inf) = ±Inf // Trunc(NaN) = NaN func Trunc(x float64) float64 func trunc(x float64) float64 { if x == 0 || IsNaN(x) || IsInf(x, 0) { return x } d, _ := Modf(x) return d } // Round returns the nearest integer, rounding half away from zero. // // Special cases are: // Round(±0) = ±0 // Round(±Inf) = ±Inf // Round(NaN) = NaN func Round(x float64) float64 { // Round is a faster implementation of: // // func Round(x float64) float64 { // t := Trunc(x) // if Abs(x-t) >= 0.5 { // return t + Copysign(1, x) // } // return t // } bits := Float64bits(x) e := uint(bits>>shift) & mask if e < bias { // Round abs(x) < 1 including denormals. bits &= signMask // +-0 if e == bias-1 { bits |= uvone // +-1 } } else if e < bias+shift { // Round any abs(x) >= 1 containing a fractional component [0,1). // // Numbers with larger exponents are returned unchanged since they // must be either an integer, infinity, or NaN. const half = 1 << (shift - 1) e -= bias bits += half >> e bits &^= fracMask >> e } return Float64frombits(bits) } // RoundToEven returns the nearest integer, rounding ties to even. // // Special cases are: // RoundToEven(±0) = ±0 // RoundToEven(±Inf) = ±Inf // RoundToEven(NaN) = NaN func RoundToEven(x float64) float64 { // RoundToEven is a faster implementation of: // // func RoundToEven(x float64) float64 { // t := math.Trunc(x) // odd := math.Remainder(t, 2) != 0 // if d := math.Abs(x - t); d > 0.5 || (d == 0.5 && odd) { // return t + math.Copysign(1, x) // } // return t // } bits := Float64bits(x) e := uint(bits>>shift) & mask if e >= bias { // Round abs(x) >= 1. // - Large numbers without fractional components, infinity, and NaN are unchanged. // - Add 0.499.. or 0.5 before truncating depending on whether the truncated // number is even or odd (respectively). const halfMinusULP = (1 << (shift - 1)) - 1 e -= bias bits += (halfMinusULP + (bits>>(shift-e))&1) >> e bits &^= fracMask >> e } else if e == bias-1 && bits&fracMask != 0 { // Round 0.5 < abs(x) < 1. bits = bits&signMask | uvone // +-1 } else { // Round abs(x) <= 0.5 including denormals. bits &= signMask // +-0 } return Float64frombits(bits) }
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