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Small improvements

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This commit is contained in:
Tomasz Drwięga 2016-03-07 18:36:17 +01:00
parent e7be3c5378
commit c5840be1cb
1 changed files with 23 additions and 7 deletions
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30
util/bigint/src/uint.rs
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@ -379,11 +379,24 @@ macro_rules! uint_overflowing_mul_reg {
($name:ident, $n_words: expr, $self_expr: expr, $other: expr) => ({
let mut res = $name::from(0u64);
let mut overflow = false;
for i in 0..(2 * $n_words) {
let v = overflowing!($self_expr.overflowing_mul_u32(($other >> (32 * i)).low_u32()), overflow);
let res2 = overflowing!(v.overflowing_shl(32 * i as u32), overflow);
res = overflowing!(res.overflowing_add(res2), overflow);
let mut current = $other;
let mut current_shift = 0;
let mut current_u32;
let mut i = 0;
while i < 2*$n_words {
current_u32 = current.low_u32();
let v = overflowing!($self_expr.overflowing_mul_u32(current_u32), overflow);
let v_shifted = overflowing!(v.overflowing_shl(current_shift), overflow);
res = overflowing!(res.overflowing_add(v_shifted), overflow);
current = current >> 32;
current_shift += 32;
i += 1;
}
(res, overflow)
})
}
@ -973,6 +986,7 @@ macro_rules! construct_uint {
let mut ret = [0u64; $n_words];
let word_shift = shift / 64;
let bit_shift = shift % 64;
for i in word_shift..$n_words {
// Shift
ret[i - word_shift] += original[i] >> bit_shift;
@ -989,9 +1003,11 @@ macro_rules! construct_uint {
fn cmp(&self, other: &$name) -> Ordering {
let &$name(ref me) = self;
let &$name(ref you) = other;
for i in 0..$n_words {
if me[$n_words - 1 - i] < you[$n_words - 1 - i] { return Ordering::Less; }
if me[$n_words - 1 - i] > you[$n_words - 1 - i] { return Ordering::Greater; }
let mut i = $n_words;
while i > 0 {
i -= 1;
if me[i] < you[i] { return Ordering::Less; }
if me[i] > you[i] { return Ordering::Greater; }
}
Ordering::Equal
}