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use awint_internals::*;
use crate::Bits;
impl Bits {
pub const fn inc_assign(&mut self, cin: bool) -> bool {
if !cin {
return false
}
for_each_mut!(
self,
x,
{0..(self.len() - 1)}
{
match x.overflowing_add(1) {
(v, false) => {
*x = v;
return false;
}
(v, true) => {
*x = v;
}
}
},
false
);
let (last, oflow) = self.last().overflowing_add(1);
if self.extra() == 0 {
*self.last_mut() = last;
oflow
} else {
let mask = MAX << self.extra();
let oflow = (last & mask) != 0;
*self.last_mut() = last & (!mask);
oflow
}
}
pub const fn dec_assign(&mut self, cin: bool) -> bool {
if cin {
return true
}
for_each_mut!(
self,
x,
{0..(self.len() - 1)}
{
match x.overflowing_sub(1) {
(v, false) => {
*x = v;
return true
}
(v, true) => {
*x = v;
}
}
},
true
);
if self.extra() == 0 {
let (last, oflow) = self.last().overflowing_add(!0);
*self.last_mut() = last;
oflow
} else {
let mask = MAX << self.extra();
let last = self.last().wrapping_add(!mask);
*self.last_mut() = last & (!mask);
(last & mask) != 0
}
}
pub const fn neg_assign(&mut self) {
self.not_assign();
self.inc_assign(true);
}
pub const fn abs_assign(&mut self) {
if self.msb() {
self.neg_assign();
}
}
pub const fn add_assign(&mut self, rhs: &Self) -> Option<()> {
let mut carry = 0;
binop_for_each_mut!(
self,
rhs,
x,
y,
{
let tmp = widen_add(*x, y, carry);
*x = tmp.0;
carry = tmp.1;
},
true
)
}
pub const fn sub_assign(&mut self, rhs: &Self) -> Option<()> {
let mut carry = 1;
binop_for_each_mut!(
self,
rhs,
x,
y,
{
let tmp = widen_add(*x, !y, carry);
*x = tmp.0;
carry = tmp.1;
},
true
)
}
pub const fn rsb_assign(&mut self, rhs: &Self) -> Option<()> {
let mut carry = 1;
binop_for_each_mut!(
self,
rhs,
x,
y,
{
let tmp = widen_add(!*x, y, carry);
*x = tmp.0;
carry = tmp.1;
},
true
)
}
pub const fn cin_sum_triop(
&mut self,
cin: bool,
lhs: &Self,
rhs: &Self,
) -> Option<(bool, bool)> {
if self.bw() != lhs.bw() || self.bw() != rhs.bw() {
return None
}
let mut carry = cin as usize;
unsafe {
const_for!(i in {0..(self.len() - 1)} {
let tmp = widen_add(lhs.get_unchecked(i), rhs.get_unchecked(i), carry);
*self.get_unchecked_mut(i) = tmp.0;
carry = tmp.1;
});
}
let tmp = widen_add(lhs.last(), rhs.last(), carry);
let extra = self.extra();
Some(if extra == 0 {
let lhs_sign = (lhs.last() as isize) < 0;
let rhs_sign = (rhs.last() as isize) < 0;
let output_sign = (tmp.0 as isize) < 0;
*self.last_mut() = tmp.0;
(
tmp.1 != 0,
(lhs_sign == rhs_sign) && (output_sign != lhs_sign),
)
} else {
let lhs_sign = (lhs.last() & (1 << (extra - 1))) != 0;
let rhs_sign = (rhs.last() & (1 << (extra - 1))) != 0;
let output_sign = (tmp.0 & (1 << (extra - 1))) != 0;
let mask = MAX << extra;
*self.last_mut() = tmp.0 & (!mask);
(
(tmp.0 & mask) != 0,
(lhs_sign == rhs_sign) && (output_sign != lhs_sign),
)
})
}
}