erigon-pulse/common/math/integer.go
Andrew Ashikhmin 9c47df0a2c
Use math.bits in common math Safe* for performance (#556)
* Use math.bits in comoon math Safe* for performance (the compiler optimizes away  math.bits)

* Prettier code in opExp
2020-05-20 14:31:23 +02:00

99 lines
2.7 KiB
Go

// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package math
import (
"fmt"
"math/bits"
"strconv"
)
// Integer limit values.
const (
MaxInt8 = 1<<7 - 1
MinInt8 = -1 << 7
MaxInt16 = 1<<15 - 1
MinInt16 = -1 << 15
MaxInt32 = 1<<31 - 1
MinInt32 = -1 << 31
MaxInt64 = 1<<63 - 1
MinInt64 = -1 << 63
MaxUint8 = 1<<8 - 1
MaxUint16 = 1<<16 - 1
MaxUint32 = 1<<32 - 1
MaxUint64 = 1<<64 - 1
)
// HexOrDecimal64 marshals uint64 as hex or decimal.
type HexOrDecimal64 uint64
// UnmarshalText implements encoding.TextUnmarshaler.
func (i *HexOrDecimal64) UnmarshalText(input []byte) error {
int, ok := ParseUint64(string(input))
if !ok {
return fmt.Errorf("invalid hex or decimal integer %q", input)
}
*i = HexOrDecimal64(int)
return nil
}
// MarshalText implements encoding.TextMarshaler.
func (i HexOrDecimal64) MarshalText() ([]byte, error) {
return []byte(fmt.Sprintf("%#x", uint64(i))), nil
}
// ParseUint64 parses s as an integer in decimal or hexadecimal syntax.
// Leading zeros are accepted. The empty string parses as zero.
func ParseUint64(s string) (uint64, bool) {
if s == "" {
return 0, true
}
if len(s) >= 2 && (s[:2] == "0x" || s[:2] == "0X") {
v, err := strconv.ParseUint(s[2:], 16, 64)
return v, err == nil
}
v, err := strconv.ParseUint(s, 10, 64)
return v, err == nil
}
// MustParseUint64 parses s as an integer and panics if the string is invalid.
func MustParseUint64(s string) uint64 {
v, ok := ParseUint64(s)
if !ok {
panic("invalid unsigned 64 bit integer: " + s)
}
return v
}
// SafeSub returns subtraction result and whether overflow occurred.
func SafeSub(x, y uint64) (uint64, bool) {
diff, borrowOut := bits.Sub64(x, y, 0)
return diff, borrowOut != 0
}
// SafeAdd returns the result and whether overflow occurred.
func SafeAdd(x, y uint64) (uint64, bool) {
sum, carryOut := bits.Add64(x, y, 0)
return sum, carryOut != 0
}
// SafeMul returns multiplication result and whether overflow occurred.
func SafeMul(x, y uint64) (uint64, bool) {
hi, lo := bits.Mul64(x, y)
return lo, hi != 0
}