Tweak addo & subo to try and fix MIPS

This commit is contained in:
Scott McMurray 2017-11-25 05:26:24 -08:00
parent 5e71218390
commit 665f268872
2 changed files with 21 additions and 8 deletions

View File

@ -1,8 +1,8 @@
use int::LargeInt;
use int::Int;
trait Add: LargeInt {
fn add(self, other: Self) -> Self {
trait UAdd: LargeInt {
fn uadd(self, other: Self) -> Self {
let (low, carry) = self.low().overflowing_add(other.low());
let high = self.high().wrapping_add(other.high());
let carry = if carry { Self::HighHalf::ONE } else { Self::HighHalf::ZERO };
@ -10,12 +10,25 @@ trait Add: LargeInt {
}
}
impl Add for u128 {}
impl UAdd for u128 {}
trait Addo: Int {
trait Add: Int
where <Self as Int>::UnsignedInt: UAdd
{
fn add(self, other: Self) -> Self {
Self::from_unsigned(self.unsigned().uadd(other.unsigned()))
}
}
impl Add for u128 {}
impl Add for i128 {}
trait Addo: Add
where <Self as Int>::UnsignedInt: UAdd
{
fn addo(self, other: Self, overflow: &mut i32) -> Self {
*overflow = 0;
let result = self.wrapping_add(other);
let result = Add::add(self, other);
if other >= Self::ZERO {
if result < self {
*overflow = 1;

View File

@ -1,5 +1,4 @@
use int::LargeInt;
use int::Int;
trait Sub: LargeInt {
fn sub(self, other: Self) -> Self {
@ -8,12 +7,13 @@ trait Sub: LargeInt {
}
}
impl Sub for i128 {}
impl Sub for u128 {}
trait Subo: Int {
trait Subo: Sub {
fn subo(self, other: Self, overflow: &mut i32) -> Self {
*overflow = 0;
let result = self.wrapping_sub(other);
let result = Sub::sub(self, other);
if other >= Self::ZERO {
if result > self {
*overflow = 1;