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Auto merge of #122582 - scottmcm:swap-intrinsic-v2, r=oli-obk

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Let codegen decide when to `mem::swap` with immediates

Making `libcore` decide this is silly; the backend has so much better information about when it's a good idea.

Thus this PR introduces a new `typed_swap` intrinsic with a fallback body, and replaces that fallback implementation when swapping immediates or scalar pairs.

r? oli-obk

Replaces #111744, and means we'll never need more libs PRs like #111803 or #107140
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bors 2024-03-23 13:57:55 +00:00
commit d6eb0f5a09
18 changed files with 370 additions and 70 deletions
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compiler/rustc_span/src/symbol.rs
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@ -1836,6 +1836,7 @@ symbols! {
type_macros,
type_name,
type_privacy_lints,
typed_swap,
u128,
u128_legacy_const_max,
u128_legacy_const_min,