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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [math/] [dim.go] - Blame information for rev 758

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Line No. Rev Author Line
1 747 jeremybenn 
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package math
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// Dim returns the maximum of x-y or 0.
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//
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// Special cases are:
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//      Dim(+Inf, +Inf) = NaN
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//      Dim(-Inf, -Inf) = NaN
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//      Dim(x, NaN) = Dim(NaN, x) = NaN
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func Dim(x, y float64) float64 {
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        return dim(x, y)
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}
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func dim(x, y float64) float64 {
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        return max(x-y, 0)
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}
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// Max returns the larger of x or y.
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//
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// Special cases are:
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//      Max(x, +Inf) = Max(+Inf, x) = +Inf
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//      Max(x, NaN) = Max(NaN, x) = NaN
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//      Max(+0, ±0) = Max(±0, +0) = +0
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//      Max(-0, -0) = -0
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func Max(x, y float64) float64 {
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        return max(x, y)
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}
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func max(x, y float64) float64 {
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        // special cases
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        switch {
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        case IsInf(x, 1) || IsInf(y, 1):
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                return Inf(1)
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        case IsNaN(x) || IsNaN(y):
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                return NaN()
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        case x == 0 && x == y:
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                if Signbit(x) {
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                        return y
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                }
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                return x
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        }
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        if x > y {
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                return x
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        }
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        return y
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}
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// Min returns the smaller of x or y.
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//
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// Special cases are:
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//      Min(x, -Inf) = Min(-Inf, x) = -Inf
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//      Min(x, NaN) = Min(NaN, x) = NaN
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//      Min(-0, ±0) = Min(±0, -0) = -0
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func Min(x, y float64) float64 {
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        return min(x, y)
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}
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func min(x, y float64) float64 {
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        // special cases
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        switch {
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        case IsInf(x, -1) || IsInf(y, -1):
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                return Inf(-1)
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        case IsNaN(x) || IsNaN(y):
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                return NaN()
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        case x == 0 && x == y:
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                if Signbit(x) {
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                        return x
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                }
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                return y
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        }
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        if x < y {
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                return x
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        }
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        return y
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}

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