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Move run_fat_lto call into execute_fat_lto_work_item

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This will allow merging all fat LTO steps together. In addition it
reduces the amount of work done on the coordinator thread without
jobserver token.
This commit is contained in:
bjorn3
2025-07-03 16:05:38 +00:00
parent 332f1b1bdd
commit 779cb00311
1 changed files with 36 additions and 32 deletions
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68
compiler/rustc_codegen_ssa/src/back/write.rs
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@@ -397,25 +397,6 @@ impl<B: WriteBackendMethods> CodegenContext<B> {
}
}
fn generate_fat_lto_work<B: ExtraBackendMethods>(
cgcx: &CodegenContext<B>,
autodiff: Vec<AutoDiffItem>,
needs_fat_lto: Vec<FatLtoInput<B>>,
import_only_modules: Vec<(SerializedModule<B::ModuleBuffer>, WorkProduct)>,
) -> WorkItem<B> {
let _prof_timer = cgcx.prof.generic_activity("codegen_generate_lto_work");
let module =
B::run_fat_lto(cgcx, needs_fat_lto, import_only_modules).unwrap_or_else(|e| e.raise());
if cgcx.lto == Lto::Fat && !autodiff.is_empty() {
let config = cgcx.config(ModuleKind::Regular);
if let Err(err) = B::autodiff(cgcx, &module, autodiff, config) {
err.raise();
}
}
WorkItem::FatLto(module)
}
fn generate_thin_lto_work<B: ExtraBackendMethods>(
cgcx: &CodegenContext<B>,
needs_thin_lto: Vec<(String, B::ThinBuffer)>,
@@ -739,7 +720,11 @@ pub(crate) enum WorkItem<B: WriteBackendMethods> {
/// directory.
CopyPostLtoArtifacts(CachedModuleCodegen),
/// Performs fat LTO on the given module.
FatLto(ModuleCodegen<B::Module>),
FatLto {
needs_fat_lto: Vec<FatLtoInput<B>>,
import_only_modules: Vec<(SerializedModule<B::ModuleBuffer>, WorkProduct)>,
autodiff: Vec<AutoDiffItem>,
},
/// Performs thin-LTO on the given module.
ThinLto(lto::ThinModule<B>),
}
@@ -748,7 +733,7 @@ impl<B: WriteBackendMethods> WorkItem<B> {
fn module_kind(&self) -> ModuleKind {
match *self {
WorkItem::Optimize(ref m) => m.kind,
WorkItem::CopyPostLtoArtifacts(_) | WorkItem::FatLto(_) | WorkItem::ThinLto(_) => {
WorkItem::CopyPostLtoArtifacts(_) | WorkItem::FatLto { .. } | WorkItem::ThinLto(_) => {
ModuleKind::Regular
}
}
@@ -798,7 +783,7 @@ impl<B: WriteBackendMethods> WorkItem<B> {
match self {
WorkItem::Optimize(m) => desc("opt", "optimize module", &m.name),
WorkItem::CopyPostLtoArtifacts(m) => desc("cpy", "copy LTO artifacts for", &m.name),
WorkItem::FatLto(_) => desc("lto", "fat LTO module", "everything"),
WorkItem::FatLto { .. } => desc("lto", "fat LTO module", "everything"),
WorkItem::ThinLto(m) => desc("lto", "thin-LTO module", m.name()),
}
}
@@ -1005,9 +990,21 @@ fn execute_copy_from_cache_work_item<B: ExtraBackendMethods>(
fn execute_fat_lto_work_item<B: ExtraBackendMethods>(
cgcx: &CodegenContext<B>,
mut module: ModuleCodegen<B::Module>,
needs_fat_lto: Vec<FatLtoInput<B>>,
import_only_modules: Vec<(SerializedModule<B::ModuleBuffer>, WorkProduct)>,
autodiff: Vec<AutoDiffItem>,
module_config: &ModuleConfig,
) -> Result<WorkItemResult<B>, FatalError> {
let mut module =
B::run_fat_lto(cgcx, needs_fat_lto, import_only_modules).unwrap_or_else(|e| e.raise());
if cgcx.lto == Lto::Fat && !autodiff.is_empty() {
let config = cgcx.config(ModuleKind::Regular);
if let Err(err) = B::autodiff(cgcx, &module, autodiff, config) {
err.raise();
}
}
B::optimize_fat(cgcx, &mut module)?;
let module = B::codegen(cgcx, module, module_config)?;
@@ -1490,13 +1487,14 @@ fn start_executing_work<B: ExtraBackendMethods>(
if !needs_fat_lto.is_empty() {
assert!(needs_thin_lto.is_empty());
let work = generate_fat_lto_work(
&cgcx,
autodiff_items.clone(),
needs_fat_lto,
import_only_modules,
);
work_items.push((work, 0));
work_items.push((
WorkItem::FatLto {
needs_fat_lto,
import_only_modules,
autodiff: autodiff_items.clone(),
},
0,
));
if cgcx.parallel {
helper.request_token();
}
@@ -1867,11 +1865,17 @@ fn spawn_work<'a, B: ExtraBackendMethods>(
);
Ok(execute_copy_from_cache_work_item(&cgcx, m, module_config))
}
WorkItem::FatLto(m) => {
WorkItem::FatLto { needs_fat_lto, import_only_modules, autodiff } => {
let _timer = cgcx
.prof
.generic_activity_with_arg("codegen_module_perform_lto", "everything");
execute_fat_lto_work_item(&cgcx, m, module_config)
execute_fat_lto_work_item(
&cgcx,
needs_fat_lto,
import_only_modules,
autodiff,
module_config,
)
}
WorkItem::ThinLto(m) => {
let _timer =