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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_hir/src/lang_items.rs
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@ -299,6 +299,8 @@ language_item_table! {
DropInPlace, sym::drop_in_place, drop_in_place_fn, Target::Fn, GenericRequirement::Minimum(1);
Oom, sym::oom, oom, Target::Fn, GenericRequirement::None;
AllocLayout, sym::alloc_layout, alloc_layout, Target::Struct, GenericRequirement::None;
ConstEvalSelect, sym::const_eval_select, const_eval_select, Target::Fn, GenericRequirement::Exact(4);
ConstConstEvalSelect, sym::const_eval_select_ct,const_eval_select_ct, Target::Fn, GenericRequirement::Exact(4);
Start, sym::start, start_fn, Target::Fn, GenericRequirement::Exact(1);