mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-27 01:04:03 +00:00
52 lines
1.3 KiB
Rust
52 lines
1.3 KiB
Rust
//@ compile-flags: -O
|
|
//@ only-x86_64
|
|
|
|
#![crate_type = "rlib"]
|
|
#![feature(asm_goto)]
|
|
|
|
use std::arch::asm;
|
|
|
|
#[no_mangle]
|
|
pub extern "C" fn panicky() {}
|
|
|
|
struct Foo;
|
|
|
|
impl Drop for Foo {
|
|
fn drop(&mut self) {
|
|
println!();
|
|
}
|
|
}
|
|
|
|
// CHECK-LABEL: @asm_goto
|
|
#[no_mangle]
|
|
pub unsafe fn asm_goto() {
|
|
// CHECK: callbr void asm sideeffect alignstack inteldialect "
|
|
// CHECK-NEXT: to label %[[FALLTHROUGHBB:[a-b0-9]+]] [label %[[JUMPBB:[a-b0-9]+]]]
|
|
asm!("jmp {}", label {});
|
|
}
|
|
|
|
// CHECK-LABEL: @asm_goto_with_outputs
|
|
#[no_mangle]
|
|
pub unsafe fn asm_goto_with_outputs() -> u64 {
|
|
let out: u64;
|
|
// CHECK: [[RES:%[0-9]+]] = callbr i64 asm sideeffect alignstack inteldialect "
|
|
// CHECK-NEXT: to label %[[FALLTHROUGHBB:[a-b0-9]+]] [label %[[JUMPBB:[a-b0-9]+]]]
|
|
asm!("{} /* {} */", out(reg) out, label { return 1; });
|
|
// CHECK: [[JUMPBB]]:
|
|
// CHECK-NEXT: [[RET:%.+]] = phi i64 [ [[RES]], %[[FALLTHROUGHBB]] ], [ 1, %start ]
|
|
// CHECK-NEXT: ret i64 [[RET]]
|
|
out
|
|
}
|
|
|
|
// CHECK-LABEL: @asm_goto_noreturn
|
|
#[no_mangle]
|
|
pub unsafe fn asm_goto_noreturn() -> u64 {
|
|
let out: u64;
|
|
// CHECK: callbr void asm sideeffect alignstack inteldialect "
|
|
// CHECK-NEXT: to label %unreachable [label %[[JUMPBB:[a-b0-9]+]]]
|
|
asm!("jmp {}", label { return 1; }, options(noreturn));
|
|
// CHECK: [[JUMPBB]]:
|
|
// CHECK-NEXT: ret i64 1
|
|
out
|
|
}
|