saymrwulf/risc0-curve25519-dalek-source
1
0
Fork 0
mirror of https://github.com/saymrwulf/risc0-curve25519-dalek-source.git synced 2026-09-04 20:03:40 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Fix a typo in AVX2

Browse source 
Last two (least significant) limbs should be `z8`, `z9`. Were probably
copy-paste typos.
This commit is contained in:
Daan Sprenkels 2019-07-22 14:17:23 +02:00 committed by GitHub
parent a659b92305
commit e4c086ab59
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 2 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
src/backend/vector/avx2/field.rs
View file

@ -856,8 +856,8 @@ impl<'a, 'b> Mul<&'b FieldElement2625x4> for &'a FieldElement2625x4 {
// z5 < ( 1 + 1 + 1 + 1 + 1 + 1 + 1*19 + 1*19 + 1*19 + 1*19 )*2^(51 + 2b) = 82*2^(51 + 2*b)
// z6 < ( 2 + 1 + 2 + 1 + 2 + 1 + 2 + 1*19 + 2*19 + 1*19 )*2^(51 + 2b) = 87*2^(51 + 2*b)
// z7 < ( 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1*19 + 1*19 )*2^(51 + 2b) = 46*2^(51 + 2*b)
// z6 < ( 2 + 1 + 2 + 1 + 2 + 1 + 2 + 1 + 2 + 1*19 )*2^(51 + 2b) = 33*2^(51 + 2*b)
// z7 < ( 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 )*2^(51 + 2b) = 10*2^(51 + 2*b)
// z8 < ( 2 + 1 + 2 + 1 + 2 + 1 + 2 + 1 + 2 + 1*19 )*2^(51 + 2b) = 33*2^(51 + 2*b)
// z9 < ( 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 )*2^(51 + 2b) = 10*2^(51 + 2*b)
//
// So z[0] fits into a u64 if 51 + 2*b + lg(249) < 64
// if b < 2.5.