arith

package

v3.3.0 Latest Latest Go to latest Published: Dec 10, 2018 License: BSD-3-Clause Imports: 5 Imported by: 0

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Repository

github.com/ericlagergren/decimal

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Documentation ¶

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Overview ¶

Package arith provides simple, primarily bit-specific, arithmetic operations.

Package pow implements basic power functions.

Index ¶

Constants
func Abs(x int64) uint64
func AbsCmp128(x, y, shift uint64) int
func Add(z, x *big.Int, y uint64) *big.Int
func Add128(x, y uint64) (z1, z0 uint64)
func BigLength(x *big.Int) int
func BigPow10(n uint64) *big.Int
func Cmp(x, y uint64) int
func CmpBits(x, y []big.Word) (r int)
func Length(x uint64) int
func Mul128(x, y uint64) (z1, z0 uint64)
func MulUint64(z, x *big.Int, y uint64) *big.Int
func Pow10(e uint64) (uint64, bool)
func Pow10Int(e uint64) (int64, bool)
func PowOfTen(x uint64) bool
func PowOfTenBig(x *big.Int) bool
func Safe(e uint64) bool
func Set128(z *big.Int, z1, z0 uint64) *big.Int
func Sub(z, x *big.Int, y uint64) *big.Int
func Words(x uint64) []big.Word

Constants ¶

View Source

const (
	// PowTabLen is the largest cached power for integers.
	PowTabLen = 20

	// BigPowTabLen is the largest cached power for *big.Ints.
	BigPowTabLen = 1e5
)

View Source

const Is32Bit = bits.UintSize == 32

Variables ¶

This section is empty.

Functions ¶

func Abs ¶

func Abs(x int64) uint64

func AbsCmp128 ¶

func AbsCmp128(x, y, shift uint64) int

AbsCmp128 compares |x| and |y|*shift in 128 bits.

func Add ¶

func Add(z, x *big.Int, y uint64) *big.Int

Add sets z to x + y and returns z. x is assumed to be unsigned.

func Add128 ¶

func Add128(x, y uint64) (z1, z0 uint64)

func BigLength ¶

func BigLength(x *big.Int) int

BigLength returns the number of digits in x.

func BigPow10 ¶

func BigPow10(n uint64) *big.Int

BigPow10 computes 10 ** n. The returned *big.Int must not be modified.

func Cmp ¶

func Cmp(x, y uint64) int

func CmpBits ¶

func CmpBits(x, y []big.Word) (r int)

func Length ¶

func Length(x uint64) int

Length returns the number of digits in x.

func Mul128 ¶

func Mul128(x, y uint64) (z1, z0 uint64)

Mul128 returns the 128-bit multiplication of x and y.

func MulUint64 ¶

func MulUint64(z, x *big.Int, y uint64) *big.Int

MulUint64 sets z to x * y and returns z. x is assumed to be unsigned.

func Pow10 ¶

func Pow10(e uint64) (uint64, bool)

Pow10 returns 10 ** e and a boolean indicating whether the result fits into a uint64.

func Pow10Int ¶

func Pow10Int(e uint64) (int64, bool)

Pow10Int returns 10 ** e and a boolean indicating whether the result fits into an int64.

func PowOfTen ¶

func PowOfTen(x uint64) bool

PowOfTen returns strue if x is a power of 10.

func PowOfTenBig ¶

func PowOfTenBig(x *big.Int) bool

PowOfTenBig returns true if x is a power of 10.

func Safe ¶

func Safe(e uint64) bool

func Set128 ¶

func Set128(z *big.Int, z1, z0 uint64) *big.Int

func Sub ¶

func Sub(z, x *big.Int, y uint64) *big.Int

Sub sets z to x - y and returns z. x is assumed to be unsigned.

func Words ¶

func Words(x uint64) []big.Word

Types ¶

This section is empty.

Source Files ¶

View all Source files

Directories ¶

Path	Synopsis
checked Package checked implements basic checked arithmetic.	Package checked implements basic checked arithmetic.

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