pub async fn impl is monomorphized when func itself is monomorphized #143290
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I don't think this needs a -Z flag. It makes a lot of sense to just change this everywhere. We can then benchmark it in the benchmark suite, too. A similar change could be done for iterator or closure returning functions. On that note: instead of collecting nested bodies in general, wouldn't it be slightly more correct to collect types that are in the opaque (non-opque types must already have all their impls monomorphized, as they are publicly reachable) return type of monomorphized functions? For opaque types we'd only need to monomorphize the trait impls that the opaque type has in its bounds cc @compiler-errors for thoughts as you wrote #135314 |
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Some changes occurred in coverage tests. cc @Zalathar |
…hized, when func itself is monomorphized
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Flag removed, behaviour changed to be default. |
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@bors try @rust-timer queue |
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pub async fn impl is monomorphized when func itself is monomorphized
Implentation coroutine (`func::{closure#0}`) is monomorphized, when func itself is monomorphized.
Currently, when `pub async fn foo(..)` is exported from lib and used in several dependent crates, only 'header' function is monomorphized in the defining crate. 'header' function, returning coroutine object, is monomorphized, but the coroutine's poll function (which actually implements all the logic for the function) is not. In such situation, `func::{closure#0}` will be monomorphized in every dependency.
This PR adds monomorphization for `func::{closure#0}` (coroutine poll function), when func itself is monomorphized.
Simple test with one lib async function and ten dependent crates (executable) that use the function, shows 5-7% compilation time improvement (single-threaded).
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☀️ Try build successful - checks-actions |
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Finished benchmarking commit (9443527): comparison URL. Overall result: ❌ regressions - please read the text belowBenchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf. Next Steps: If you can justify the regressions found in this try perf run, please do so in sufficient writing along with @bors rollup=never Instruction countOur most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.
Max RSS (memory usage)Results (primary -3.1%, secondary 2.4%)A less reliable metric. May be of interest, but not used to determine the overall result above.
CyclesResults (primary 2.5%, secondary 4.9%)A less reliable metric. May be of interest, but not used to determine the overall result above.
Binary sizeResults (secondary 9.4%)A less reliable metric. May be of interest, but not used to determine the overall result above.
Bootstrap: 462.08s -> 462.853s (0.17%) |
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Some tests need blessing The performance regression is expected, as the regressing benchmark has public |
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In particular, you will need to set |
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Implentation coroutine (
func::{closure#0}) is monomorphized, when func itself is monomorphized.Currently, when
pub async fn foo(..)is exported from lib and used in several dependent crates, only 'header' function is monomorphized in the defining crate. 'header' function, returning coroutine object, is monomorphized, but the coroutine's poll function (which actually implements all the logic for the function) is not. In such situation,func::{closure#0}will be monomorphized in every dependency.This PR adds monomorphization for
func::{closure#0}(coroutine poll function), when func itself is monomorphized.Simple test with one lib async function and ten dependent crates (executable) that use the function, shows 5-7% compilation time improvement (single-threaded).