#[inline(never)] does not work for async functions #129347
Description
I would expect the following code produced a Future::poll() impl with the noinline attribute.
#![feature(noop_waker)] use std::task::{Context, Waker, Poll}; use std::future::Future; #[inline(never)] pub async fn foo() -> u32 { std::hint::black_box(1) } pub fn bar() -> Poll<u32> { let f = std::pin::pin!(foo()); f.poll(&mut Context::from_waker(Waker::noop())) }Instead, the poll method has inlinehint applied to it and gets inlined accordingly:
; This is the function creating the async fn obj: ; Function Attrs: noinline nonlazybind uwtable define i8 @_RNvCs8Nh0J9OTdDr_15async_fn_inline3foo() unnamed_addr #2 { %1 = alloca [1 x i8], align 1 store i8 0, ptr %1, align 1 %2 = load i8, ptr %1, align 1 ret i8 %2 } ; This the poll method: ; Function Attrs: inlinehint nonlazybind uwtable <== this should arguably be noinline too define internal { i32, i32 } @_RNCNvCs8Nh0J9OTdDr_15async_fn_inline3foo0B3_(...)Meta
rustc --version --verbose:
rustc 1.82.0-nightly (636d7ff91 2024-08-19) binary: rustc commit-hash: 636d7ff91b9847d6d43c7bbe023568828f6e3246 commit-date: 2024-08-19 host: x86_64-unknown-linux-gnu release: 1.82.0-nightly LLVM version: 19.1.0