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arithmetic.go
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arithmetic.go
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package loader
import (
"math"
"math/bits"
)
func clampAddUint64(x uint64, y uint64) uint64 {
z, carry := bits.Add64(x, y, 0)
if carry != 0 {
return math.MaxUint64
}
return z
}
/*
func clampSubUint64(x uint64, y uint64) uint64 {
z, borrow := bits.Sub64(x, y, 0)
if borrow != 0 {
return 0
}
return z
}
*/
type addrRange struct {
min, max uint64
}
func newAddrRange() addrRange {
return addrRange{min: math.MaxUint64, max: 0}
}
func (a addrRange) len() uint64 {
if a.min >= a.max {
return 0
}
return a.max - a.min
}
func (a addrRange) contains(addr uint64) bool {
if a.len() == 0 {
return false
}
return a.min <= addr && addr < a.max
}
func (a addrRange) containsRange(b addrRange) bool {
if a.len() == 0 || b.len() == 0 {
return false
}
return a.min <= b.min && a.max >= b.max
}
func (a *addrRange) extendToFit(x uint64) {
if x < a.min {
a.min = x
}
if x > a.max {
a.max = x
}
}
func (a *addrRange) insert(b addrRange) {
if b.len() == 0 {
return
}
if b.min < a.min {
a.min = b.min
}
if b.max > a.max {
a.max = b.max
}
}