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Upgrade to LLVM 14 LLVM patch state: * [x] https://github.com/llvm/llvm-project/commit/a55727f334b39600bfc71144b11b42aae6b94e0b Backported. * [x] https://github.com/rust-lang/llvm-project/commit/c3c82dc12402dd41441180c0c6cf7aed7e330c53 Backported as https://github.com/llvm/llvm-project/commit/917c47b3bf0dfc45a2a5ba12c1397d647ecf4017. * [x] https://github.com/rust-lang/llvm-project/commit/6e8f9ab632d12271355d10d34c9835a7ba14e4b9 No plan to upstream. * [x] https://github.com/llvm/llvm-project/commit/319f4b2d52e31b000db75a0a2484b5f2ab90534a Backported. * [x] https://github.com/rust-lang/llvm-project/commit/8b2c25d321f877161f85218479e2d1317d770e18 No plan to upstream. * [x] https://github.com/rust-lang/llvm-project/commit/75fef2efd427362c8f16b2d09e6ebf44069e3919 No plan to upstream. * [ ] https://github.com/rust-lang/llvm-project/commit/adef757547de5a570d9f6a00d3e6ac16c666ab79 Upstreamed as https://github.com/llvm/llvm-project/commit/2d2ef384b2f6e723edb793d08f52e7f4dc94ba3a. Needs backport. * [x] https://github.com/rust-lang/llvm-project/commit/4b7c1b4910e9fa9e04f23f06be078e168ef4c0ee No plan to upstream. * [x] https://github.com/rust-lang/llvm-project/commit/3f5ab0c061adb723f25b94243828b6b5407720c8 No plan to upstream. * [x] https://github.com/rust-lang/llvm-project/commit/514d05500e0e15e358f05f5c4cec78a805858f8e No plan to upstream. * [ ] https://github.com/rust-lang/llvm-project/commit/54c586958564582b3341d1838a5de86541e5fecf Under review at https://reviews.llvm.org/D119695 and https://reviews.llvm.org/D119856. Release timeline: * LLVM 14.0.0 final planned for Mar 15. * Rust 1.60.0 planned for Apr 7. Compile-time: * https://perf.rust-lang.org/compare.html?start=250384edc5d78533e993f38c60d64e42b21684b2&end=b87df8d2c7c5d9ac448c585de10927ab2ee1b864 * A slight improvement on average, though no big changes either way. * There are some larger max-rss improvements. r? `@ghost`
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.