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Use get_many_mut to reduce the cost of setting up check cfg values #97657

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merged 1 commit into from
Jun 21, 2022
+90 −34
Merged

Use get_many_mut to reduce the cost of setting up check cfg values #97657

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123 changes: 89 additions & 34 deletions compiler/rustc_session/src/config.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1102,41 +1102,96 @@ impl CrateCheckConfig {
.extend(atomic_values);

// Target specific values
for target in
TARGETS.iter().map(|target| Target::expect_builtin(&TargetTriple::from_triple(target)))
#[cfg(bootstrap)]
{
self.values_valid
.entry(sym::target_os)
.or_default()
.insert(Symbol::intern(&target.options.os));
self.values_valid
.entry(sym::target_family)
.or_default()
.extend(target.options.families.iter().map(|family| Symbol::intern(family)));
self.values_valid
.entry(sym::target_arch)
.or_default()
.insert(Symbol::intern(&target.arch));
self.values_valid
.entry(sym::target_endian)
.or_default()
.insert(Symbol::intern(&target.options.endian.as_str()));
self.values_valid
.entry(sym::target_env)
.or_default()
.insert(Symbol::intern(&target.options.env));
self.values_valid
.entry(sym::target_abi)
.or_default()
.insert(Symbol::intern(&target.options.abi));
self.values_valid
.entry(sym::target_vendor)
.or_default()
.insert(Symbol::intern(&target.options.vendor));
self.values_valid
.entry(sym::target_pointer_width)
.or_default()
.insert(sym::integer(target.pointer_width));
for target in TARGETS
.iter()
.map(|target| Target::expect_builtin(&TargetTriple::from_triple(target)))
{
self.values_valid
.entry(sym::target_os)
.or_default()
.insert(Symbol::intern(&target.options.os));
self.values_valid
.entry(sym::target_family)
.or_default()
.extend(target.options.families.iter().map(|family| Symbol::intern(family)));
self.values_valid
.entry(sym::target_arch)
.or_default()
.insert(Symbol::intern(&target.arch));
self.values_valid
.entry(sym::target_endian)
.or_default()
.insert(Symbol::intern(&target.options.endian.as_str()));
self.values_valid
.entry(sym::target_env)
.or_default()
.insert(Symbol::intern(&target.options.env));
self.values_valid
.entry(sym::target_abi)
.or_default()
.insert(Symbol::intern(&target.options.abi));
self.values_valid
.entry(sym::target_vendor)
.or_default()
.insert(Symbol::intern(&target.options.vendor));
self.values_valid
.entry(sym::target_pointer_width)
.or_default()
.insert(sym::integer(target.pointer_width));
}
}

// Target specific values
#[cfg(not(bootstrap))]
{
const VALUES: [&Symbol; 8] = [
&sym::target_os,
&sym::target_family,
&sym::target_arch,
&sym::target_endian,
&sym::target_env,
&sym::target_abi,
&sym::target_vendor,
&sym::target_pointer_width,
];

// Initialize (if not already initialized)
for &e in VALUES {
self.values_valid.entry(e).or_default();
}

// Get all values map at once otherwise it would be costly.
// (8 values * 220 targets ~= 1760 times, at the time of writing this comment).
let [
values_target_os,
values_target_family,
values_target_arch,
values_target_endian,
values_target_env,
values_target_abi,
values_target_vendor,
values_target_pointer_width,
] = self
.values_valid
.get_many_mut(VALUES)
.expect("unable to get all the check-cfg values buckets");

for target in TARGETS
.iter()
.map(|target| Target::expect_builtin(&TargetTriple::from_triple(target)))
{
values_target_os.insert(Symbol::intern(&target.options.os));
values_target_family
.extend(target.options.families.iter().map(|family| Symbol::intern(family)));
values_target_arch.insert(Symbol::intern(&target.arch));
values_target_endian.insert(Symbol::intern(&target.options.endian.as_str()));
values_target_env.insert(Symbol::intern(&target.options.env));
values_target_abi.insert(Symbol::intern(&target.options.abi));
values_target_vendor.insert(Symbol::intern(&target.options.vendor));
values_target_pointer_width.insert(sym::integer(target.pointer_width));
}
}
}

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1 change: 1 addition & 0 deletions compiler/rustc_session/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
#![feature(once_cell)]
#![feature(option_get_or_insert_default)]
#![feature(rustc_attrs)]
#![cfg_attr(not(bootstrap), feature(map_many_mut))]
#![recursion_limit = "256"]
#![allow(rustc::potential_query_instability)]

Expand Down