mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-22 23:04:33 +00:00
39 lines
1.4 KiB
Rust
39 lines
1.4 KiB
Rust
// LLVM does not support some atomic RMW operations on pointers, so inside codegen we lower those
|
|
// to integer atomics, surrounded by casts to and from integer type.
|
|
// This test ensures that we do the round-trip correctly for AtomicPtr::fetch_byte_add, and also
|
|
// ensures that we do not have such a round-trip for AtomicPtr::swap, because LLVM supports pointer
|
|
// arguments to `atomicrmw xchg`.
|
|
|
|
//@ compile-flags: -O -Cno-prepopulate-passes
|
|
#![crate_type = "lib"]
|
|
|
|
#![feature(strict_provenance)]
|
|
#![feature(strict_provenance_atomic_ptr)]
|
|
|
|
use std::sync::atomic::AtomicPtr;
|
|
use std::sync::atomic::Ordering::Relaxed;
|
|
use std::ptr::without_provenance_mut;
|
|
|
|
// Portability hack so that we can say [[USIZE]] instead of i64/i32/i16 for usize.
|
|
// CHECK: @helper([[USIZE:i[0-9]+]] noundef %_1)
|
|
#[no_mangle]
|
|
pub fn helper(_: usize) {}
|
|
|
|
// CHECK-LABEL: @atomicptr_fetch_byte_add
|
|
#[no_mangle]
|
|
pub fn atomicptr_fetch_byte_add(a: &AtomicPtr<u8>, v: usize) -> *mut u8 {
|
|
// CHECK: %[[INTPTR:.*]] = ptrtoint ptr %{{.*}} to [[USIZE]]
|
|
// CHECK-NEXT: %[[RET:.*]] = atomicrmw add ptr %{{.*}}, [[USIZE]] %[[INTPTR]]
|
|
// CHECK-NEXT: inttoptr [[USIZE]] %[[RET]] to ptr
|
|
a.fetch_byte_add(v, Relaxed)
|
|
}
|
|
|
|
// CHECK-LABEL: @atomicptr_swap
|
|
#[no_mangle]
|
|
pub fn atomicptr_swap(a: &AtomicPtr<u8>, ptr: *mut u8) -> *mut u8 {
|
|
// CHECK-NOT: ptrtoint
|
|
// CHECK: atomicrmw xchg ptr %{{.*}}, ptr %{{.*}} monotonic
|
|
// CHECK-NOT: inttoptr
|
|
a.swap(ptr, Relaxed)
|
|
}
|