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skip codegen for intrinsics with big fallback bodies if backend does not need them

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This commit is contained in:
Ralf Jung 2026-01-02 18:39:06 +01:00
parent 8a24a202aa
commit 57e44f5046
6 changed files with 25 additions and 9 deletions
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9
compiler/rustc_monomorphize/src/collector.rs
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@ -1001,11 +1001,12 @@ fn visit_instance_use<'tcx>(
if tcx.should_codegen_locally(panic_instance) {
output.push(create_fn_mono_item(tcx, panic_instance, source));
}
} else if !intrinsic.must_be_overridden {
} else if !intrinsic.must_be_overridden
&& !tcx.sess.replaced_intrinsics.contains(&intrinsic.name)
{
// Codegen the fallback body of intrinsics with fallback bodies.
// We explicitly skip this otherwise to ensure we get a linker error
// if anyone tries to call this intrinsic and the codegen backend did not
// override the implementation.
// We have to skip this otherwise as there's no body to codegen.
// We also skip intrinsics the backend handles, to reduce monomorphizations.
let instance = ty::Instance::new_raw(instance.def_id(), instance.args);
if tcx.should_codegen_locally(instance) {
output.push(create_fn_mono_item(tcx, instance, source));