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document that __rust_alloc is also magic to our LLVM fork #79077

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Nov 17, 2020
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document that __rust_alloc is also magic to our LLVM fork #79077

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2 changes: 2 additions & 0 deletions library/alloc/src/alloc.rs
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Expand Up @@ -23,6 +23,8 @@ extern "Rust" {
// (the code expanding that attribute macro generates those functions), or to call
// the default implementations in libstd (`__rdl_alloc` etc. in `library/std/src/alloc.rs`)
// otherwise.
// The rustc fork of LLVM also special-cases these function names to be able to optimize them
// like `malloc`, `realloc`, and `free`, respectively.
#[rustc_allocator]
#[rustc_allocator_nounwind]
fn __rust_alloc(size: usize, align: usize) -> *mut u8;
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