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//! Structural-hash CSE probe/insert wave.
use std::sync::Arc;
use vyre_foundation::ir::model::expr::Ident;
use vyre_foundation::ir::{BufferAccess, BufferDecl, DataType, Expr, Node, Program};
use super::ast_ops::{AST_ADD, AST_PTR_DEREF, AST_VAR};
/// Stable op id for the structural CSE child region.
pub const OP_ID: &str = "vyre-primitives::parsing::ast_cse_structural_hash";
/// Emit the structural-hash deduplication phase.
#[must_use]
#[allow(clippy::too_many_arguments)]
pub fn ast_cse_structural_hash(
ast_opcodes: &str,
ast_lefts: &str,
ast_rights: &str,
ast_vals: &str,
hash_set: &str,
hash_set_capacity: u32,
out_modified_flag: &str,
t: Expr,
) -> Vec<Node> {
vec![Node::if_then(
Expr::or(
Expr::eq(Expr::var("op"), Expr::u32(AST_ADD)),
Expr::eq(Expr::var("op"), Expr::u32(AST_PTR_DEREF)),
),
vec![
Node::let_bind("l_idx2", Expr::load(ast_lefts, t.clone())),
Node::let_bind("r_idx2", Expr::load(ast_rights, t.clone())),
Node::let_bind(
"h",
Expr::bitxor(
Expr::mul(Expr::var("op"), Expr::u32(0x01000193)),
Expr::var("l_idx2"),
),
),
Node::assign(
"h",
Expr::bitxor(
Expr::mul(Expr::var("h"), Expr::u32(0x01000193)),
Expr::var("r_idx2"),
),
),
Node::let_bind(
"slot",
Expr::rem(Expr::var("h"), Expr::u32(hash_set_capacity)),
),
Node::let_bind("active", Expr::bool(true)),
Node::loop_for(
"probe",
Expr::u32(0),
Expr::u32(hash_set_capacity),
vec![Node::if_then(
Expr::var("active"),
vec![
Node::let_bind("slot_hash", Expr::mul(Expr::var("slot"), Expr::u32(2))),
Node::let_bind("slot_idx", Expr::add(Expr::var("slot_hash"), Expr::u32(1))),
Node::let_bind(
"old_hash",
Expr::atomic_compare_exchange(
hash_set,
Expr::var("slot_hash"),
Expr::u32(0),
Expr::var("h"),
),
),
Node::if_then(
Expr::eq(Expr::var("old_hash"), Expr::u32(0)),
vec![
Node::let_bind(
"_",
Expr::atomic_exchange(
hash_set,
Expr::var("slot_idx"),
t.clone(),
),
),
Node::assign("active", Expr::bool(false)),
],
),
Node::let_bind(
"earliest",
Expr::Select {
cond: Box::new(Expr::eq(Expr::var("old_hash"), Expr::var("h"))),
true_val: Box::new(Expr::atomic_add(
hash_set,
Expr::var("slot_idx"),
Expr::u32(0),
)),
false_val: Box::new(Expr::u32(u32::MAX)),
},
),
Node::if_then(
Expr::and(
Expr::eq(Expr::var("old_hash"), Expr::var("h")),
Expr::lt(Expr::var("earliest"), t.clone()),
),
vec![
Node::store(ast_opcodes, t.clone(), Expr::u32(AST_VAR)),
Node::store(ast_vals, t.clone(), Expr::var("earliest")),
Node::let_bind(
"_",
Expr::atomic_add(out_modified_flag, Expr::u32(0), Expr::u32(1)),
),
],
),
Node::if_then(
Expr::eq(Expr::var("old_hash"), Expr::var("h")),
vec![Node::assign("active", Expr::bool(false))],
),
Node::assign(
"slot",
Expr::rem(
Expr::add(Expr::var("slot"), Expr::u32(1)),
Expr::u32(hash_set_capacity),
),
),
],
)],
),
],
)]
}
/// Build the standalone structural-hash CSE primitive.
#[must_use]
pub fn ast_cse_structural_hash_program(num_nodes: u32, hash_set_capacity: u32) -> Program {
let t = Expr::InvocationId { axis: 0 };
let body = vec![
Node::if_then(
Expr::lt(t.clone(), Expr::u32(hash_set_capacity)),
vec![
Node::store("hash_set", Expr::mul(t.clone(), Expr::u32(2)), Expr::u32(0)),
Node::store(
"hash_set",
Expr::add(Expr::mul(t.clone(), Expr::u32(2)), Expr::u32(1)),
Expr::u32(u32::MAX),
),
],
),
Node::barrier(),
Node::if_then(
Expr::eq(t.clone(), Expr::u32(0)),
vec![Node::loop_for(
"node_idx",
Expr::u32(0),
Expr::u32(num_nodes),
vec![
Node::let_bind("op", Expr::load("ast_opcodes", Expr::var("node_idx"))),
Node::if_then(
Expr::or(
Expr::eq(Expr::var("op"), Expr::u32(AST_ADD)),
Expr::eq(Expr::var("op"), Expr::u32(AST_PTR_DEREF)),
),
vec![
Node::let_bind(
"l_idx2",
Expr::load("ast_lefts", Expr::var("node_idx")),
),
Node::let_bind(
"r_idx2",
Expr::load("ast_rights", Expr::var("node_idx")),
),
Node::let_bind(
"h",
Expr::bitxor(
Expr::mul(Expr::var("op"), Expr::u32(0x01000193)),
Expr::var("l_idx2"),
),
),
Node::assign(
"h",
Expr::bitxor(
Expr::mul(Expr::var("h"), Expr::u32(0x01000193)),
Expr::var("r_idx2"),
),
),
Node::let_bind(
"slot",
Expr::rem(Expr::var("h"), Expr::u32(hash_set_capacity)),
),
Node::let_bind("active", Expr::bool(true)),
Node::loop_for(
"probe",
Expr::u32(0),
Expr::u32(hash_set_capacity),
vec![Node::if_then(
Expr::var("active"),
vec![
Node::let_bind(
"slot_hash",
Expr::mul(Expr::var("slot"), Expr::u32(2)),
),
Node::let_bind(
"slot_idx",
Expr::add(Expr::var("slot_hash"), Expr::u32(1)),
),
Node::let_bind(
"old_hash",
Expr::load("hash_set", Expr::var("slot_hash")),
),
Node::if_then(
Expr::eq(Expr::var("old_hash"), Expr::u32(0)),
vec![
Node::store(
"hash_set",
Expr::var("slot_hash"),
Expr::var("h"),
),
Node::store(
"hash_set",
Expr::var("slot_idx"),
Expr::var("node_idx"),
),
Node::assign("active", Expr::bool(false)),
],
),
Node::if_then(
Expr::eq(Expr::var("old_hash"), Expr::var("h")),
vec![
Node::let_bind(
"earliest",
Expr::load("hash_set", Expr::var("slot_idx")),
),
Node::if_then(
Expr::lt(
Expr::var("earliest"),
Expr::var("node_idx"),
),
vec![
Node::store(
"ast_opcodes",
Expr::var("node_idx"),
Expr::u32(AST_VAR),
),
Node::store(
"ast_vals",
Expr::var("node_idx"),
Expr::var("earliest"),
),
Node::let_bind(
"_",
Expr::atomic_add(
"out_modified_flag",
Expr::u32(0),
Expr::u32(1),
),
),
],
),
Node::assign("active", Expr::bool(false)),
],
),
Node::assign(
"slot",
Expr::rem(
Expr::add(Expr::var("slot"), Expr::u32(1)),
Expr::u32(hash_set_capacity),
),
),
],
)],
),
],
),
],
)],
),
];
Program::wrapped(
vec![
BufferDecl::storage("ast_opcodes", 0, BufferAccess::ReadWrite, DataType::U32)
.with_count(num_nodes),
BufferDecl::storage("ast_lefts", 1, BufferAccess::ReadOnly, DataType::U32)
.with_count(num_nodes),
BufferDecl::storage("ast_rights", 2, BufferAccess::ReadOnly, DataType::U32)
.with_count(num_nodes),
BufferDecl::storage("ast_vals", 3, BufferAccess::ReadWrite, DataType::U32)
.with_count(num_nodes),
BufferDecl::storage("hash_set", 4, BufferAccess::ReadWrite, DataType::U32)
.with_count(hash_set_capacity.saturating_mul(2)),
BufferDecl::storage(
"out_modified_flag",
5,
BufferAccess::ReadWrite,
DataType::U32,
)
.with_count(1),
],
[num_nodes.max(hash_set_capacity).max(1), 1, 1],
vec![Node::Region {
generator: Ident::from(OP_ID),
source_region: None,
body: Arc::new(body),
}],
)
}
#[cfg(feature = "inventory-registry")]
fn fixture_u32(words: &[u32]) -> Vec<u8> {
words.iter().flat_map(|word| word.to_le_bytes()).collect()
}
#[cfg(feature = "inventory-registry")]
fn structural_hash(op: u32, left: u32, right: u32) -> u32 {
let prime = 0x0100_0193_u32;
let h = op.wrapping_mul(prime) ^ left;
h.wrapping_mul(prime) ^ right
}
#[cfg(feature = "inventory-registry")]
inventory::submit! {
crate::harness::OpEntry::new(
OP_ID,
|| ast_cse_structural_hash_program(2, 8),
Some(|| vec![vec![
fixture_u32(&[AST_ADD, AST_ADD]),
fixture_u32(&[1, 1]),
fixture_u32(&[2, 2]),
fixture_u32(&[0, 0]),
fixture_u32(&[0; 16]),
fixture_u32(&[0]),
]]),
Some(|| {
let h = structural_hash(AST_ADD, 1, 2);
let mut hash_set = [0_u32; 16];
for slot in 0..8 {
hash_set[slot * 2 + 1] = u32::MAX;
}
let slot = (h % 8) as usize;
hash_set[slot * 2] = h;
hash_set[slot * 2 + 1] = 0;
vec![vec![
fixture_u32(&[AST_ADD, AST_VAR]),
fixture_u32(&[0, 0]),
fixture_u32(&hash_set),
fixture_u32(&[1]),
]]
}),
)
}