Erik Desjardins
74ef47e90c
special case that's not present in Clang Making the methods consistent doesn't require much justification. It's required for us to generate correct code. The special case was present near the end of `CastTarget::llvm_type`, and resulted in the final integer component of the ABI type being shrunk to the smallest integer that fits. You can see this in action here (https://godbolt.org/z/Pe73cr91d), where, for a struct with 5 u16 elements, rustc generates `{ i64, i16 }`, while Clang generates `[2 x i64]`. This special case was added a long time ago, when the function was originally written [1]. That commit consolidated logic from many backends, and in some of the code it deleted, sparc64 [2] and powerpc64 [3] had similar special cases. However, looking at Clang today, it doesn't have this special case for sparc64 (https://godbolt.org/z/YaafvYWdf) or powerpc64 (https://godbolt.org/z/5c3YePTje), so this change just removes it. [1]: https://github.com/rust-lang/rust/commit/f0636b61c7f84962a609e831760db9d77f4f5e14#diff-183c4dadf10704bd1f521b71f71d89bf755c9603a93f894d66c03bb1effc6021R231 [2]: https://github.com/rust-lang/rust/commit/f0636b61c7f84962a609e831760db9d77f4f5e14#diff-2d8f87ea6db6d7f0a6fbeb1d5549adc07e93331278d951a1e051a40f92914436L163-L166 [3]: https://github.com/rust-lang/rust/commit/f0636b61c7f84962a609e831760db9d77f4f5e14#diff-88af4a9df9ead503a5c7774a0455d270dea3ba60e9b0ec1ce550b4c53d3bce3bL172-L175
The Rust Programming Language
This is the main source code repository for Rust. It contains the compiler, standard library, and documentation.
Note: this README is for users rather than contributors. If you wish to contribute to the compiler, you should read CONTRIBUTING.md instead.
Table of Contents
Quick Start
Read "Installation" from The Book.
Installing from Source
If you really want to install from source (though this is not recommended), see INSTALL.md.
Getting Help
See https://www.rust-lang.org/community for a list of chat platforms and forums.
Contributing
See CONTRIBUTING.md.
License
Rust is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), with portions covered by various BSD-like licenses.
See LICENSE-APACHE, LICENSE-MIT, and COPYRIGHT for details.
Trademark
The Rust Foundation owns and protects the Rust and Cargo trademarks and logos (the "Rust Trademarks").
If you want to use these names or brands, please read the media guide.
Third-party logos may be subject to third-party copyrights and trademarks. See Licenses for details.