rust/compiler/rustc_codegen_ssa at 781ec111b728a4d1ae513ae57d5eecf27680a216 - rust

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T

bors 2836482241 Auto merge of #129283 - saethlin:unreachable-allocas, r=scottmcm

Don't alloca for unused locals

We already have a concept of mono-unreachable basic blocks; this is primarily useful for ensuring that we do not compile code under an `if false`. But since we never gave locals the same analysis, a large local only used under an `if false` will still have stack space allocated for it.

There are 3 places we traverse MIR during monomorphization: Inside the collector, `non_ssa_locals`, and the walk to generate code. Unfortunately, https://github.com/rust-lang/rust/pull/129283#issuecomment-2297925578 indicates that we cannot afford the expense of tracking reachable locals during the collector's traversal, so we do need at least two mono-reachable traversals. And of course caching is of no help here because the benchmarks that regress are incr-unchanged; they don't do any codegen.

This fixes the second problem in https://github.com/rust-lang/rust/issues/129282, and brings us anther step toward `const if` at home.

2024-09-21 13:48:14 +00:00

src

Auto merge of #129283 - saethlin:unreachable-allocas, r=scottmcm

2024-09-21 13:48:14 +00:00

Cargo.toml

Update the wasm-component-ld binary dependency

2024-08-29 14:39:12 -07:00

messages.ftl

simd_shuffle: require index argument to be a vector

2024-09-14 14:43:24 +02:00

README.md

mv compiler to compiler/

2020-08-30 18:45:07 +03:00

README.md

Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.