107 lines
3.1 KiB
Rust
107 lines
3.1 KiB
Rust
use unsigned::add::unsafe_addition;
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pub fn subtract(res: &mut [u64], spare: &mut [u64], other: &mut [u64])
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{
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for i in 0..res.len() {
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other[i] = !other[i];
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}
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spare[0] = 1;
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unsafe_addition(other, &spare, true);
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unsafe_addition(res, &other, true);
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}
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macro_rules! subtraction_impls
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{
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($name: ident, $size: expr) => {
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impl SubAssign for $name {
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fn sub_assign(&mut self, rhs: $name) {
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let mut temp = [0; $size];
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subtract(&mut self.value, &mut temp, &mut rhs.value.clone());
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}
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}
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impl<'a> SubAssign<&'a $name> for $name {
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fn sub_assign(&mut self, rhs: &$name) {
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let mut temp = [0; $size];
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subtract(&mut self.value, &mut temp, &mut rhs.value.clone());
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}
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}
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impl Sub for $name {
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type Output = $name;
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fn sub(self, rhs: $name) -> $name {
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let mut res = self.clone();
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let mut temp = [0; $size];
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subtract(&mut res.value, &mut temp, &mut rhs.value.clone());
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res
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}
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}
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impl<'a> Sub<$name> for &'a $name {
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type Output = $name;
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fn sub(self, rhs: $name) -> $name {
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let mut res = self.clone();
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let mut temp = [0; $size];
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subtract(&mut res.value, &mut temp, &mut rhs.value.clone());
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res
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}
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}
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impl<'a> Sub<&'a $name> for $name {
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type Output = $name;
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fn sub(self, rhs: &$name) -> $name {
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let mut res = self.clone();
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let mut temp = [0; $size];
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subtract(&mut res.value, &mut temp, &mut rhs.value.clone());
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res
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}
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}
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impl<'a,'b> Sub<&'a $name> for &'b $name {
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type Output = $name;
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fn sub(self, rhs: &$name) -> $name {
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let mut res = self.clone();
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let mut temp = [0; $size];
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subtract(&mut res.value, &mut temp, &mut rhs.value.clone());
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res
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}
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}
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}
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}
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#[cfg(test)]
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macro_rules! generate_sub_tests {
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($name: ident, $lname: ident) => {
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#[test]
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fn $lname() {
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generate_sub_tests!(body $name, $lname);
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}
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};
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(ignore $name: ident, $lname: ident) => {
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#[test]
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#[ignore]
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fn $lname() {
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generate_sub_tests!(body $name, $lname);
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}
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};
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(body $name: ident, $lname: ident) => {
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let fname = format!("testdata/sub/{}.tests", stringify!($name));
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run_test(fname.to_string(), 3, |case| {
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let (neg0, abytes) = case.get("a").unwrap();
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let (neg1, bbytes) = case.get("b").unwrap();
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let (neg2, cbytes) = case.get("c").unwrap();
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assert!(!neg0 && !neg1 && !neg2);
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let mut a = $name::from_bytes(abytes);
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let b = $name::from_bytes(bbytes);
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let c = $name::from_bytes(cbytes);
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assert_eq!(c, &a - &b);
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a -= b;
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assert_eq!(c, a);
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});
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};
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} |