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Auto merge of #89247 - fee1-dead:const-eval-select, r=oli-obk

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Add `const_eval_select` intrinsic

Adds an intrinsic that calls a given function when evaluated at compiler time, but generates a call to another function when called at runtime.

See https://github.com/rust-lang/const-eval/issues/7 for previous discussion.

r? `@oli-obk.`
This commit is contained in:
bors 2021-10-14 10:06:30 +00:00
commit c34ac8747c
22 changed files with 372 additions and 39 deletions
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2
compiler/rustc_feature/src/builtin_attrs.rs
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@ -467,6 +467,8 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
rustc_attr!(rustc_promotable, Normal, template!(Word), IMPL_DETAIL),
rustc_attr!(rustc_legacy_const_generics, Normal, template!(List: "N"), INTERNAL_UNSTABLE),
// Do not const-check this function's body. It will always get replaced during CTFE.
rustc_attr!(rustc_do_not_const_check, Normal, template!(Word), INTERNAL_UNSTABLE),
// ==========================================================================
// Internal attributes, Layout related: