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const_pass.rs
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const_pass.rs
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use crate::math::{Fp, Fp4};
use crate::parser::Code;
use crate::pass::Pass;
use crate::structures::{ReadAddr, StructuredInstruction};
use std::cell::RefCell;
use std::collections::HashMap;
use std::rc::Rc;
#[derive(Clone)]
pub enum RedirectionEntry {
Const(Fp4),
RefSub(u32, u32),
}
pub struct ConstPass;
impl Pass for ConstPass {
fn pass(code: &mut Code) -> anyhow::Result<()> {
let mem = Rc::new(RefCell::new(HashMap::<u32, RedirectionEntry>::new()));
mem.borrow_mut()
.insert(0, RedirectionEntry::Const(Fp4::default()));
let refresh_and_get_constant = |r: &mut ReadAddr| match r {
ReadAddr::Ref(x) => {
if mem.borrow().contains_key(x) {
let m = mem.borrow().get(x).unwrap().clone();
match m {
RedirectionEntry::Const(val) => {
*r = ReadAddr::Const(val.clone());
Some(val.clone())
}
RedirectionEntry::RefSub(val, idx) => {
*r = ReadAddr::RefSub(val, idx);
None
}
}
} else {
None
}
}
ReadAddr::RefSub(x, idx) => {
if mem.borrow().contains_key(x) {
let m = (mem.borrow().get(x).unwrap()).clone();
match m {
RedirectionEntry::Const(val) => {
let new_val = if *idx == 0 {
Fp4::new(val.0.clone(), Fp::ZERO, Fp::ZERO, Fp::ZERO)
} else if *idx == 1 {
Fp4::new(val.1.clone(), Fp::ZERO, Fp::ZERO, Fp::ZERO)
} else if *idx == 2 {
Fp4::new(val.2.clone(), Fp::ZERO, Fp::ZERO, Fp::ZERO)
} else {
Fp4::new(val.3.clone(), Fp::ZERO, Fp::ZERO, Fp::ZERO)
};
*r = ReadAddr::Const(new_val);
Some(val.clone())
}
RedirectionEntry::RefSub(val, val_idx) => {
if *idx == 0 {
*r = ReadAddr::RefSub(val, val_idx);
None
} else {
*r = ReadAddr::Const(Fp4::default());
Some(Fp4::default())
}
}
}
} else {
None
}
}
ReadAddr::Const(v) => Some(v.clone()),
};
for (insn, _) in code.0.iter_mut() {
match insn {
StructuredInstruction::BIT_AND_ELEM(w, r1, r2) => {
let d1 = refresh_and_get_constant(r1);
let d2 = refresh_and_get_constant(r2);
if d1.is_some() && d2.is_some() {
let d1 = d1.unwrap();
let d2 = d2.unwrap();
mem.borrow_mut().insert(
*w,
RedirectionEntry::Const(Fp4::new(
&d1.0 & &d2.0,
Fp::ZERO,
Fp::ZERO,
Fp::ZERO,
)),
);
*insn = StructuredInstruction::__DELETE__;
}
}
StructuredInstruction::BIT_AND_SHORTS(w, r1, r2) => {
let d1 = refresh_and_get_constant(r1);
let d2 = refresh_and_get_constant(r2);
if d1.is_some() && d2.is_some() {
let d1 = d1.unwrap();
let d2 = d2.unwrap();
mem.borrow_mut().insert(
*w,
RedirectionEntry::Const(Fp4::new(
&(&d1.0 & &d2.0) + &((&d1.1 & &d2.1) << 16),
Fp::ZERO,
Fp::ZERO,
Fp::ZERO,
)),
);
*insn = StructuredInstruction::__DELETE__;
}
}
StructuredInstruction::BIT_XOR_SHORTS(w, r1, r2) => {
let d1 = refresh_and_get_constant(r1);
let d2 = refresh_and_get_constant(r2);
if d1.is_some() && d2.is_some() {
let d1 = d1.unwrap();
let d2 = d2.unwrap();
mem.borrow_mut().insert(
*w,
RedirectionEntry::Const(Fp4::new(
&d1.0 ^ &d2.0,
&d1.1 ^ &d2.1,
Fp::ZERO,
Fp::ZERO,
)),
);
*insn = StructuredInstruction::__DELETE__;
}
}
StructuredInstruction::SHA_LOAD_FROM_MONTGOMERY(r) => {
refresh_and_get_constant(r);
}
StructuredInstruction::SHA_LOAD(r) => {
refresh_and_get_constant(r);
}
StructuredInstruction::SET_GLOBAL(r1, r2, r3, r4, _) => {
refresh_and_get_constant(r1);
refresh_and_get_constant(r2);
refresh_and_get_constant(r3);
refresh_and_get_constant(r4);
}
StructuredInstruction::CONST(w, v1, v2) => {
mem.borrow_mut().insert(
*w,
RedirectionEntry::Const(Fp4::new(Fp(*v1), Fp(*v2), Fp::ZERO, Fp::ZERO)),
);
*insn = StructuredInstruction::__DELETE__;
}
StructuredInstruction::ADD(w, r1, r2) => {
let d1 = refresh_and_get_constant(r1);
let d2 = refresh_and_get_constant(r2);
if d1.is_some() && d2.is_some() {
let d1 = d1.unwrap();
let d2 = d2.unwrap();
mem.borrow_mut()
.insert(*w, RedirectionEntry::Const(&d1 + &d2));
*insn = StructuredInstruction::__DELETE__;
} else if d1.is_some() && d1.unwrap() == Fp4::default() {
*insn = StructuredInstruction::__MOV__(*w, r2.clone());
} else if d2.is_some() && d2.unwrap() == Fp4::default() {
*insn = StructuredInstruction::__MOV__(*w, r1.clone());
}
}
StructuredInstruction::SUB(w, r1, r2) => {
let d1 = refresh_and_get_constant(r1);
let d2 = refresh_and_get_constant(r2);
if d1.is_some() && d2.is_some() {
let d1 = d1.unwrap();
let d2 = d2.unwrap();
mem.borrow_mut()
.insert(*w, RedirectionEntry::Const(&d1 - &d2));
*insn = StructuredInstruction::__DELETE__;
} else if d2.is_some() && d2.unwrap() == Fp4::default() {
*insn = StructuredInstruction::__MOV__(*w, r1.clone());
}
}
StructuredInstruction::MUL(w, r1, r2) => {
let d1 = refresh_and_get_constant(r1);
let d2 = refresh_and_get_constant(r2);
if d1.is_some() && d2.is_some() {
let d1 = d1.unwrap();
let d2 = d2.unwrap();
mem.borrow_mut()
.insert(*w, RedirectionEntry::Const(&d1 * &d2));
*insn = StructuredInstruction::__DELETE__;
} else if d1.is_some() && d1.unwrap() == Fp4::default() {
mem.borrow_mut()
.insert(*w, RedirectionEntry::Const(Fp4::default()));
*insn = StructuredInstruction::__DELETE__;
} else if d2.is_some() && d2.unwrap() == Fp4::default() {
mem.borrow_mut()
.insert(*w, RedirectionEntry::Const(Fp4::default()));
*insn = StructuredInstruction::__DELETE__;
}
}
StructuredInstruction::NOT(w, r) => {
let d = refresh_and_get_constant(r);
if d.is_some() {
let d = d.unwrap();
if d.0 .0 == 0 {
mem.borrow_mut().insert(
*w,
RedirectionEntry::Const(Fp4::new(
Fp(1),
Fp::ZERO,
Fp::ZERO,
Fp::ZERO,
)),
);
} else {
mem.borrow_mut().insert(
*w,
RedirectionEntry::Const(Fp4::new(
Fp::ZERO,
Fp::ZERO,
Fp::ZERO,
Fp::ZERO,
)),
);
}
}
}
StructuredInstruction::INV(w, r) => {
let d = refresh_and_get_constant(r);
if d.is_some() {
let d = d.unwrap();
mem.borrow_mut()
.insert(*w, RedirectionEntry::Const(d.inv()));
}
}
StructuredInstruction::EQ(r1, r2) => {
let d1 = refresh_and_get_constant(r1);
let d2 = refresh_and_get_constant(r2);
if d1.is_some() && d2.is_some() {
let d1 = d1.unwrap();
let d2 = d2.unwrap();
if d1 == d2 {
*insn = StructuredInstruction::__DELETE__;
} else {
*insn = StructuredInstruction::__PANIC__;
}
}
}
StructuredInstruction::MIX_RNG_WITH_PERV(w, fp, prev, r1, r2) => {
let d1 = refresh_and_get_constant(r1);
let d2 = refresh_and_get_constant(r2);
let d_prev = refresh_and_get_constant(prev);
if d1.is_some() && d2.is_some() && d_prev.is_some() {
let d1 = d1.unwrap();
let d2 = d2.unwrap();
let d_prev = d_prev.unwrap();
let mut val = Fp(*fp) * d_prev.1;
const SHIFT_WORD: Fp = Fp(1 << 16);
val = val * SHIFT_WORD + d1.1;
val = val * SHIFT_WORD + d1.0;
val = val * SHIFT_WORD + d2.1;
val = val * SHIFT_WORD + d2.0;
mem.borrow_mut().insert(
*w,
RedirectionEntry::Const(Fp4::new(val, Fp::ZERO, Fp::ZERO, Fp::ZERO)),
);
*insn = StructuredInstruction::__DELETE__;
}
}
StructuredInstruction::MIX_RNG(w, r1, r2) => {
let d1 = refresh_and_get_constant(r1);
let d2 = refresh_and_get_constant(r2);
if d1.is_some() && d2.is_some() {
let d1 = d1.unwrap();
let d2 = d2.unwrap();
const SHIFT_WORD: Fp = Fp(1 << 16);
let mut val = d1.1;
val = val * SHIFT_WORD + d1.0;
val = val * SHIFT_WORD + d2.1;
val = val * SHIFT_WORD + d2.0;
mem.borrow_mut().insert(
*w,
RedirectionEntry::Const(Fp4::new(val, Fp::ZERO, Fp::ZERO, Fp::ZERO)),
);
*insn = StructuredInstruction::__DELETE__;
}
}
StructuredInstruction::SELECT(w, s, r1, r2) => {
let s = refresh_and_get_constant(s);
let d1 = refresh_and_get_constant(r1);
let d2 = refresh_and_get_constant(r2);
if s.is_some() {
let s = s.unwrap();
if s.0 == Fp(1) {
if d1.is_some() {
mem.borrow_mut()
.insert(*w, RedirectionEntry::Const(d1.unwrap()));
*insn = StructuredInstruction::__DELETE__;
} else {
*insn = StructuredInstruction::__MOV__(*w, r1.clone());
}
} else {
if d2.is_some() {
mem.borrow_mut()
.insert(*w, RedirectionEntry::Const(d2.unwrap()));
*insn = StructuredInstruction::__DELETE__;
} else {
*insn = StructuredInstruction::__MOV__(*w, r2.clone());
}
}
}
}
StructuredInstruction::EXTRACT(w, r, idx) => {
let d = refresh_and_get_constant(r);
if d.is_some() {
let d = d.unwrap();
let sub = if *idx == 0 {
d.0
} else if *idx == 1 {
d.1
} else if *idx == 2 {
d.2
} else {
d.3
};
mem.borrow_mut().insert(
*w,
RedirectionEntry::Const(Fp4::new(sub, Fp::ZERO, Fp::ZERO, Fp::ZERO)),
);
*insn = StructuredInstruction::__DELETE__;
} else {
match r {
ReadAddr::Ref(v) => {
mem.borrow_mut()
.insert(*w, RedirectionEntry::RefSub(*v, *idx));
*insn = StructuredInstruction::__DELETE__;
}
ReadAddr::RefSub(v, v_idx) => {
if *idx == 0 {
mem.borrow_mut()
.insert(*w, RedirectionEntry::RefSub(*v, *v_idx));
} else {
mem.borrow_mut()
.insert(*w, RedirectionEntry::Const(Fp4::default()));
}
*insn = StructuredInstruction::__DELETE__;
}
ReadAddr::Const(_) => {}
}
}
}
StructuredInstruction::POSEIDON_LOAD_FROM_MONTGOMERY(
_,
_,
r1,
r2,
r3,
r4,
r5,
r6,
r7,
r8,
) => {
refresh_and_get_constant(r1);
refresh_and_get_constant(r2);
refresh_and_get_constant(r3);
refresh_and_get_constant(r4);
refresh_and_get_constant(r5);
refresh_and_get_constant(r6);
refresh_and_get_constant(r7);
refresh_and_get_constant(r8);
}
StructuredInstruction::POSEIDON_LOAD(_, _, r1, r2, r3, r4, r5, r6, r7, r8) => {
refresh_and_get_constant(r1);
refresh_and_get_constant(r2);
refresh_and_get_constant(r3);
refresh_and_get_constant(r4);
refresh_and_get_constant(r5);
refresh_and_get_constant(r6);
refresh_and_get_constant(r7);
refresh_and_get_constant(r8);
}
StructuredInstruction::POSEIDON_ADD_LOAD_FROM_MONTGOMERY(
_,
_,
r1,
r2,
r3,
r4,
r5,
r6,
r7,
r8,
) => {
refresh_and_get_constant(r1);
refresh_and_get_constant(r2);
refresh_and_get_constant(r3);
refresh_and_get_constant(r4);
refresh_and_get_constant(r5);
refresh_and_get_constant(r6);
refresh_and_get_constant(r7);
refresh_and_get_constant(r8);
}
StructuredInstruction::POSEIDON_ADD_LOAD(_, _, r1, r2, r3, r4, r5, r6, r7, r8) => {
refresh_and_get_constant(r1);
refresh_and_get_constant(r2);
refresh_and_get_constant(r3);
refresh_and_get_constant(r4);
refresh_and_get_constant(r5);
refresh_and_get_constant(r6);
refresh_and_get_constant(r7);
refresh_and_get_constant(r8);
}
StructuredInstruction::__MOV__(w, r) => {
let d = refresh_and_get_constant(r);
if d.is_some() {
mem.borrow_mut()
.insert(*w, RedirectionEntry::Const(d.unwrap()));
*insn = StructuredInstruction::__DELETE__;
}
}
_ => {}
}
}
Ok(())
}
}