0b93798959
The unwind path is always cold, so that should not have bad performance implications. This avoids catastrophic exponential inlining, and also decreases the size of librustc.so by 1.5% (OTOH, the size of `libstd.so` increased by 0.5% for some reason). Fixes #41696.
60 lines
2.1 KiB
Rust
60 lines
2.1 KiB
Rust
// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// this used to cause exponential code-size blowup during LLVM passes.
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#![feature(test)]
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extern crate test;
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struct MayUnwind;
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impl Drop for MayUnwind {
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fn drop(&mut self) {
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if test::black_box(false) {
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panic!()
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}
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}
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}
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struct DS<U> {
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may_unwind: MayUnwind,
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name: String,
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next: U,
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}
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fn add<U>(ds: DS<U>, name: String) -> DS<DS<U>> {
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DS {
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may_unwind: MayUnwind,
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name: "?".to_owned(),
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next: ds,
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}
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}
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fn main() {
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let deserializers = DS { may_unwind: MayUnwind, name: "?".to_owned(), next: () };
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let deserializers = add(deserializers, "?".to_owned());
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let deserializers = add(deserializers, "?".to_owned());
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let deserializers = add(deserializers, "?".to_owned());
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let deserializers = add(deserializers, "?".to_owned());
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let deserializers = add(deserializers, "?".to_owned());
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let deserializers = add(deserializers, "?".to_owned());
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let deserializers = add(deserializers, "?".to_owned()); // 0.7s
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let deserializers = add(deserializers, "?".to_owned()); // 1.3s
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let deserializers = add(deserializers, "?".to_owned()); // 2.4s
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let deserializers = add(deserializers, "?".to_owned()); // 6.7s
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let deserializers = add(deserializers, "?".to_owned()); // 26.0s
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let deserializers = add(deserializers, "?".to_owned()); // 114.0s
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let deserializers = add(deserializers, "?".to_owned()); // 228.0s
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let deserializers = add(deserializers, "?".to_owned()); // 400.0s
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let deserializers = add(deserializers, "?".to_owned()); // 800.0s
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let deserializers = add(deserializers, "?".to_owned()); // 1600.0s
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let deserializers = add(deserializers, "?".to_owned()); // 3200.0s
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}
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