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Rollup merge of #76973 - lzutao:unstably-const-assume, r=oli-obk

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Unstably allow assume intrinsic in const contexts

Not sure much about this usage because there are concerns
about [blocking  optimization][1] and [slowing down LLVM][2] when using `assme` intrinsic
in inline functions.
But since Oli suggested in https://github.com/rust-lang/rust/issues/76960#issuecomment-695772221,
here we are.

[1]: https://github.com/rust-lang/rust/pull/54995#issuecomment-429302709
[2]: https://github.com/rust-lang/rust/issues/49572#issuecomment-589615423
This commit is contained in:
Jonas Schievink 2020-09-25 19:42:29 +02:00 • committed by GitHub
commit 1b8c939a8d
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10 changed files with 39 additions and 15 deletions
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6
compiler/rustc_codegen_ssa/src/traits/intrinsic.rs
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@ -5,9 +5,9 @@ use rustc_span::Span;
use rustc_target::abi::call::FnAbi;
pub trait IntrinsicCallMethods<'tcx>: BackendTypes {
/// Remember to add all intrinsics here, in librustc_typeck/check/mod.rs,
/// and in libcore/intrinsics.rs; if you need access to any llvm intrinsics,
/// add them to librustc_codegen_llvm/context.rs
/// Remember to add all intrinsics here, in `compiler/rustc_typeck/src/check/mod.rs`,
/// and in `library/core/src/intrinsics.rs`; if you need access to any LLVM intrinsics,
/// add them to `compiler/rustc_codegen_llvm/src/context.rs`.
fn codegen_intrinsic_call(
&mut self,
instance: ty::Instance<'tcx>,