Improve 64-bit to 32-bit limb conversion
The code base is now on Rust 1.56 and Rust edition 2021. As per https://github.com/zcash/pasta_curves/pull/31#discussion_r824826344 the code can now be simplified. This commit is also adding a test for the u64_to_u32 function.
This commit is contained in:
parent
1bd803d57b
commit
67e5595702
|
@ -12,10 +12,28 @@ pub use fq::*;
|
|||
fn u64_to_u32(limbs: &[u64]) -> alloc::vec::Vec<u32> {
|
||||
limbs
|
||||
.iter()
|
||||
.flat_map(|limb| {
|
||||
Some((limb & 0xFFFF_FFFF) as u32)
|
||||
.into_iter()
|
||||
.chain(Some((limb >> 32) as u32))
|
||||
})
|
||||
.flat_map(|limb| [(limb & 0xFFFF_FFFF) as u32, (limb >> 32) as u32].into_iter())
|
||||
.collect()
|
||||
}
|
||||
|
||||
#[cfg(feature = "gpu")]
|
||||
#[test]
|
||||
fn test_u64_to_u32() {
|
||||
use rand::{RngCore, SeedableRng};
|
||||
use rand_xorshift::XorShiftRng;
|
||||
|
||||
let mut rng = XorShiftRng::from_seed([0; 16]);
|
||||
let u64_limbs: alloc::vec::Vec<u64> = (0..6).map(|_| rng.next_u64()).collect();
|
||||
let u32_limbs = crate::fields::u64_to_u32(&u64_limbs);
|
||||
|
||||
let u64_le_bytes: alloc::vec::Vec<u8> = u64_limbs
|
||||
.iter()
|
||||
.flat_map(|limb| limb.to_le_bytes())
|
||||
.collect();
|
||||
let u32_le_bytes: alloc::vec::Vec<u8> = u32_limbs
|
||||
.iter()
|
||||
.flat_map(|limb| limb.to_le_bytes())
|
||||
.collect();
|
||||
|
||||
assert_eq!(u64_le_bytes, u32_le_bytes);
|
||||
}
|
||||
|
|
Loading…
Reference in New Issue