Enum Operations 

pub enum Operations {
    Mul6464NoSum = 1,
    Mul6464Sum = 2,
    Mul6464FullSum = 3,
    Mul6464Reduce = 4,
    Add64 = 8,
    Sub64 = 9,
    Double64 = 10,
    Xor64 = 11,
    ShiftLeft32 = 16,
    ShiftRight32 = 17,
    Copy = 20,
    Remask = 21,
    Compare = 22,
    CompareFast = 23,
}

Variants

Mul6464NoSum = 1

Walking 1 or more of J loop, doing r=a*b using 64x64=128

Mul6464Sum = 2

Walking 1 or more of J loop, doing c,r=r+a*b using 64x64=128, but assume inner j loop

Mul6464FullSum = 3

Walking 1 or more of J loop, doing c,r=r+a*b using 64x64=128, but sum all of w.

Mul6464Reduce = 4

Walking 1 or more of J loop, doing c,r[-1]=r+a*b using 64x64=128, but skip 1st write

Add64 = 8

Walking add with off_AB, and in/out off_RES doing c,r=r+a+c using 64+64=65

Sub64 = 9

Walking subtract with off_AB, and in/out off_RES doing r=r-a uding 64-64=64, with last borrow implicit if any

Double64 = 10

Walking add to self with off_RES doing c,r=r+r+c using 64+64=65

Xor64 = 11

Walking XOR with off_AB, and in/out off_RES doing r=r^a using 64^64=64

ShiftLeft32 = 16

Walking shift left doing r1,r=(b*D)|r1, where D is 2^amt and is loaded by app (off_CD not used)

ShiftRight32 = 17

Walking shift right doing r,r1=(b*D)|r1, where D is 2^(32-amt) and is loaded by app (off_CD not used) and off_RES starts at MSW

Copy = 20

Copy from ABoff to resoff, 64b at a time

Remask = 21

Copy and mask from ABoff to resoff, 64b at a time

Compare = 22

Compare two arrays, running all the way to the end

CompareFast = 23

Compare two arrays, stopping on 1st !=^