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rust/compiler/rustc_middle
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bors 2d5a628a1d Auto merge of #128165 - saethlin:optimize-clone-shims, r=compiler-errors 
Let InstCombine remove Clone shims inside Clone shims

The Clone shims that we generate tend to recurse into other Clone shims, which gets very silly very quickly. Here's our current state: https://godbolt.org/z/E69YeY8eq

So I've added InstSimplify to the shims optimization passes, and improved `is_trivially_pure_clone_copy` so that it can delete those calls inside the shim. This makes the shim way smaller because most of its size is the required ceremony for unwinding.

This change also completely breaks the UI test added for https://github.com/rust-lang/rust/issues/104870. With this PR, that program ICEs in MIR type checking because `is_trivially_pure_clone_copy` and the trait solver disagree on whether `*mut u8` is `Copy`. And adding the requisite `Copy` impl to make them agree makes the test not generate any diagnostics. Considering that I spent most of my time on this PR fixing `#![no_core]` tests, I would prefer to just delete this one. The maintenance burden of `#![no_core]` is uniquely high because when they break they tend to break in very confusing ways.

try-job: x86_64-mingw
2024-07-26 13:13:04 +00:00
..
src Auto merge of #128165 - saethlin:optimize-clone-shims, r=compiler-errors 2024-07-26 13:13:04 +00:00
Cargo.toml Auto merge of #127042 - GrigorenkoPV:derivative, r=compiler-errors 2024-07-25 22:50:58 +00:00
messages.ftl Re-implement a type-size based limit 2024-07-02 15:48:48 -04:00
README.md

README.md

For more information about how rustc works, see the rustc dev guide.