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This commit is contained in:
nora 2022-04-17 18:39:06 +02:00
parent f88c486088
commit 039b5ea9c7
7 changed files with 156 additions and 27 deletions
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20
rust2/src/mir/opts.rs
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@ -9,18 +9,18 @@ use crate::mir::{
/// this pass fills out as much state info for all statements as possible
#[tracing::instrument(skip(alloc, mir))]
pub fn passes<'mir>(alloc: &'mir Bump, mir: &mut Mir<'mir>) {
pass_get_state_info(alloc, mir);
pass_fill_state_info(alloc, mir);
pass_const_propagation(mir);
}
/// this pass fills out as much state info for all statements as possible
#[tracing::instrument(skip(alloc, mir))]
pub fn pass_get_state_info<'mir>(alloc: &'mir Bump, mir: &mut Mir<'mir>) {
pub fn pass_fill_state_info<'mir>(alloc: &'mir Bump, mir: &mut Mir<'mir>) {
let empty_state = MemoryState::empty(alloc);
pass_get_state_info_inner(alloc, mir, empty_state);
pass_fill_state_info_inner(alloc, mir, empty_state);
}
#[tracing::instrument(skip(alloc, mir))]
fn pass_get_state_info_inner<'mir>(
fn pass_fill_state_info_inner<'mir>(
alloc: &'mir Bump,
mir: &mut Mir<'mir>,
mut outer: MemoryState<'mir>,
@ -65,9 +65,9 @@ fn pass_get_state_info_inner<'mir>(
StmtKind::PointerMove(n) => {
MemoryState::single(alloc, outer, MemoryStateChange::Move(*n))
}
StmtKind::Loop(body) => {
StmtKind::Loop(body, _) => {
// TODO: we can get a lot smarter here and get huge benefits; we don't yet
pass_get_state_info_inner(alloc, body, MemoryState::empty(alloc));
pass_fill_state_info_inner(alloc, body, MemoryState::empty(alloc));
MemoryState::double(
alloc,
outer,
@ -80,7 +80,7 @@ fn pass_get_state_info_inner<'mir>(
},
)
}
StmtKind::Out => outer,
StmtKind::Out(_) => outer,
StmtKind::In(store) => MemoryState::single(
alloc,
outer,
@ -111,16 +111,16 @@ fn pass_const_propagation(mir: &mut Mir<'_>) {
fn pass_const_propagation_inner(mir: &mut Mir<'_>) {
for stmt in &mut mir.stmts {
match &mut stmt.kind {
StmtKind::Out => {
StmtKind::Out(_) => {
let state = stmt.state.state_for_offset(0);
info!(?state, "We got the state of the output 😳😳😳");
// we could now insert a `SetN` before the `Out`, to mark the previous store
// as dead.
}
StmtKind::Loop(body) => {
StmtKind::Loop(body, _) => {
let state = stmt.state.state_for_offset(0);
info!(?state, "We got the state of the output 😳😳😳");
// we could now insert a `SetN` before the `Out`, to mark the previous store
// we could now insert a `SetN` before the `Loop`, to mark the previous store
// as dead.
pass_const_propagation_inner(body);
}