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Merge pull request #1078 from CohenArthur/remove-clone-on-nop-filling

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Remove clone() when removing extra stack operations
This commit is contained in:
bjorn3 2020-08-23 22:09:08 +02:00 committed by GitHub
commit a9a262ad5a
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3 changed files with 32 additions and 20 deletions
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8
Cargo.lock generated
View File

@ -1,5 +1,11 @@
# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
[[package]]
name = "ahash"
version = "0.3.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e8fd72866655d1904d6b0997d0b07ba561047d070fbe29de039031c641b61217"
[[package]]
name = "anyhow"
version = "1.0.32"
@ -197,6 +203,7 @@ version = "0.8.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "34f595585f103464d8d2f6e9864682d74c1601fed5e07d62b1c9058dba8246fb"
dependencies = [
"ahash",
"autocfg",
]
@ -325,6 +332,7 @@ dependencies = [
"cranelift-object",
"cranelift-simplejit",
"gimli",
"hashbrown",
"indexmap",
"libloading",
"object",

1
Cargo.toml
View File

@ -23,6 +23,7 @@ byteorder = "1.2.7"
indexmap = "1.0.2"
cfg-if = "0.1.10"
libloading = { version = "0.6.0", optional = true }
hashbrown = "0.8.1"
# Uncomment to use local checkout of cranelift
#[patch."https://github.com/bytecodealliance/wasmtime/"]

43
src/optimize/stack2reg.rs
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@ -13,12 +13,15 @@ use std::collections::BTreeMap;
use std::fmt;
use std::ops::Not;
use rustc_data_structures::fx::FxHashSet;
use rustc_data_structures::fx::{FxHashSet, FxHasher};
use cranelift_codegen::cursor::{Cursor, FuncCursor};
use cranelift_codegen::ir::{InstructionData, Opcode, ValueDef};
use cranelift_codegen::ir::immediates::Offset32;
use hashbrown::HashSet;
use std::hash::BuildHasherDefault;
use crate::prelude::*;
/// Workaround for `StackSlot` not implementing `Ord`.
@ -45,9 +48,9 @@ impl Ord for OrdStackSlot {
#[derive(Debug, Default)]
struct StackSlotUsage {
stack_addr: FxHashSet<Inst>,
stack_load: FxHashSet<Inst>,
stack_store: FxHashSet<Inst>,
stack_addr: HashSet<Inst, BuildHasherDefault<FxHasher>>,
stack_load: HashSet<Inst, BuildHasherDefault<FxHasher>>,
stack_store: HashSet<Inst, BuildHasherDefault<FxHasher>>,
}
impl StackSlotUsage {
@ -79,16 +82,14 @@ impl StackSlotUsage {
}).collect::<Vec<Inst>>()
}
fn remove_unused_stack_addr(&mut self, func: &mut Function, inst: Inst) {
fn remove_unused_stack_addr(func: &mut Function, inst: Inst) {
func.dfg.detach_results(inst);
func.dfg.replace(inst).nop();
self.stack_addr.remove(&inst);
}
fn remove_unused_load(&mut self, func: &mut Function, load: Inst) {
fn remove_unused_load(func: &mut Function, load: Inst) {
func.dfg.detach_results(load);
func.dfg.replace(load).nop();
self.stack_load.remove(&load);
}
fn remove_dead_store(&mut self, func: &mut Function, store: Inst) {
@ -314,19 +315,21 @@ fn remove_unused_stack_addr_and_stack_load(opt_ctx: &mut OptimizeContext<'_>) {
}
// Replace all unused stack_addr and stack_load instructions with nop.
for stack_slot_users in opt_ctx.stack_slot_usage_map.values_mut() {
// FIXME remove clone
for &inst in stack_slot_users.stack_addr.clone().iter() {
if stack_addr_load_insts_users.get(&inst).map(|users| users.is_empty()).unwrap_or(true) {
stack_slot_users.remove_unused_stack_addr(&mut opt_ctx.ctx.func, inst);
}
}
let mut func = &mut opt_ctx.ctx.func;
for &inst in stack_slot_users.stack_load.clone().iter() {
if stack_addr_load_insts_users.get(&inst).map(|users| users.is_empty()).unwrap_or(true) {
stack_slot_users.remove_unused_load(&mut opt_ctx.ctx.func, inst);
}
}
// drain_filter() on hashbrown::HashSet drains the items that do *not* match the
// predicate. Once hashbrown gets updated to match the behaviour of std::drain_filter
// (0.8.2), the predicate will have to be reversed
for stack_slot_users in opt_ctx.stack_slot_usage_map.values_mut() {
stack_slot_users
.stack_addr
.drain_filter(|inst| !(stack_addr_load_insts_users.get(inst).map(|users| users.is_empty()).unwrap_or(true)))
.for_each(|inst| StackSlotUsage::remove_unused_stack_addr(&mut func, inst));
stack_slot_users
.stack_load
.drain_filter(|inst| !(stack_addr_load_insts_users.get(inst).map(|users| users.is_empty()).unwrap_or(true)))
.for_each(|inst| StackSlotUsage::remove_unused_load(&mut func, inst));
}
}