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// Copyright 2015 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. // This file implements the Bits type used for testing Float operations // via an independent (albeit slower) representations for floating-point // numbers. package big import ( "fmt" "sort" "testing" ) // A Bits value b represents a finite floating-point number x of the form // // x = 2**b[0] + 2**b[1] + ... 2**b[len(b)-1] // // The order of slice elements is not significant. Negative elements may be // used to form fractions. A Bits value is normalized if each b[i] occurs at // most once. For instance Bits{0, 0, 1} is not normalized but represents the // same floating-point number as Bits{2}, which is normalized. The zero (nil) // value of Bits is a ready to use Bits value and represents the value 0. type Bits []int func (x Bits) add(y Bits) Bits { return append(x, y...) } func (x Bits) mul(y Bits) Bits { var p Bits for _, x := range x { for _, y := range y { p = append(p, x+y) } } return p } func TestMulBits(t *testing.T) { for _, test := range []struct { x, y, want Bits }{ {nil, nil, nil}, {Bits{}, Bits{}, nil}, {Bits{0}, Bits{0}, Bits{0}}, {Bits{0}, Bits{1}, Bits{1}}, {Bits{1}, Bits{1, 2, 3}, Bits{2, 3, 4}}, {Bits{-1}, Bits{1}, Bits{0}}, {Bits{-10, -1, 0, 1, 10}, Bits{1, 2, 3}, Bits{-9, -8, -7, 0, 1, 2, 1, 2, 3, 2, 3, 4, 11, 12, 13}}, } { got := fmt.Sprintf("%v", test.x.mul(test.y)) want := fmt.Sprintf("%v", test.want) if got != want { t.Errorf("%v * %v = %s; want %s", test.x, test.y, got, want) } } } // norm returns the normalized bits for x: It removes multiple equal entries // by treating them as an addition (e.g., Bits{5, 5} => Bits{6}), and it sorts // the result list for reproducible results. func (x Bits) norm() Bits { m := make(map[int]bool) for _, b := range x { for m[b] { m[b] = false b++ } m[b] = true } var z Bits for b, set := range m { if set { z = append(z, b) } } sort.Ints([]int(z)) return z } func TestNormBits(t *testing.T) { for _, test := range []struct { x, want Bits }{ {nil, nil}, {Bits{}, Bits{}}, {Bits{0}, Bits{0}}, {Bits{0, 0}, Bits{1}}, {Bits{3, 1, 1}, Bits{2, 3}}, {Bits{10, 9, 8, 7, 6, 6}, Bits{11}}, } { got := fmt.Sprintf("%v", test.x.norm()) want := fmt.Sprintf("%v", test.want) if got != want { t.Errorf("normBits(%v) = %s; want %s", test.x, got, want) } } } // round returns the Float value corresponding to x after rounding x // to prec bits according to mode. func (x Bits) round(prec uint, mode RoundingMode) *Float { x = x.norm() // determine range var min, max int for i, b := range x { if i == 0 || b < min { min = b } if i == 0 || b > max { max = b } } prec0 := uint(max + 1 - min) if prec >= prec0 { return x.Float() } // prec < prec0 // determine bit 0, rounding, and sticky bit, and result bits z var bit0, rbit, sbit uint var z Bits r := max - int(prec) for _, b := range x { switch { case b == r: rbit = 1 case b < r: sbit = 1 default: // b > r if b == r+1 { bit0 = 1 } z = append(z, b) } } // round f := z.Float() // rounded to zero if mode == ToNearestAway { panic("not yet implemented") } if mode == ToNearestEven && rbit == 1 && (sbit == 1 || sbit == 0 && bit0 != 0) || mode == AwayFromZero { // round away from zero f.SetMode(ToZero).SetPrec(prec) f.Add(f, Bits{int(r) + 1}.Float()) } return f } // Float returns the *Float z of the smallest possible precision such that // z = sum(2**bits[i]), with i = range bits. If multiple bits[i] are equal, // they are added: Bits{0, 1, 0}.Float() == 2**0 + 2**1 + 2**0 = 4. func (bits Bits) Float() *Float { // handle 0 if len(bits) == 0 { return new(Float) } // len(bits) > 0 // determine lsb exponent var min int for i, b := range bits { if i == 0 || b < min { min = b } } // create bit pattern x := NewInt(0) for _, b := range bits { badj := b - min // propagate carry if necessary for x.Bit(badj) != 0 { x.SetBit(x, badj, 0) badj++ } x.SetBit(x, badj, 1) } // create corresponding float z := new(Float).SetInt(x) // normalized if e := int64(z.exp) + int64(min); MinExp <= e && e <= MaxExp { z.exp = int32(e) } else { // this should never happen for our test cases panic("exponent out of range") } return z } func TestFromBits(t *testing.T) { for _, test := range []struct { bits Bits want string }{ // all different bit numbers {nil, "0"}, {Bits{0}, "0x.8p+1"}, {Bits{1}, "0x.8p+2"}, {Bits{-1}, "0x.8p+0"}, {Bits{63}, "0x.8p+64"}, {Bits{33, -30}, "0x.8000000000000001p+34"}, {Bits{255, 0}, "0x.8000000000000000000000000000000000000000000000000000000000000001p+256"}, // multiple equal bit numbers {Bits{0, 0}, "0x.8p+2"}, {Bits{0, 0, 0, 0}, "0x.8p+3"}, {Bits{0, 1, 0}, "0x.8p+3"}, {append(Bits{2, 1, 0} /* 7 */, Bits{3, 1} /* 10 */ ...), "0x.88p+5" /* 17 */}, } { f := test.bits.Float() if got := f.Text('p', 0); got != test.want { t.Errorf("setBits(%v) = %s; want %s", test.bits, got, test.want) } } }