| //@ compile-flags: -Copt-level=3 |
| |
| #![crate_type = "lib"] |
| |
| // Non-overlapping scopes should produce correct llvm.lifetimes, |
| // which allow reuse of the same stack allocation. |
| |
| pub struct WithOffset<T> { |
| pub data: T, |
| pub offset: usize, |
| } |
| |
| #[inline(never)] |
| pub fn peak_w(w: &WithOffset<&[u8; 16]>) { |
| std::hint::black_box(w); |
| } |
| |
| #[inline(never)] |
| pub fn use_w(w: WithOffset<&[u8; 16]>) { |
| std::hint::black_box(w); |
| } |
| |
| // CHECK-LABEL: @scoped_small_structs |
| // CHECK-NEXT: start: |
| // CHECK-NEXT: [[B:%.*]] = alloca |
| // CHECK-NEXT: [[A:%.*]] = alloca |
| // CHECK: call void @llvm.lifetime.start.p0({{(i64 16, )?}}ptr {{.*}}[[A]]) |
| // CHECK: call void @llvm.lifetime.end.p0({{(i64 16, )?}}ptr {{.*}}[[A]]) |
| // CHECK: call void @llvm.lifetime.start.p0({{(i64 16, )?}}ptr {{.*}}[[B]]) |
| // CHECK: call void @llvm.lifetime.end.p0({{(i64 16, )?}}ptr {{.*}}[[B]]) |
| #[no_mangle] |
| pub fn scoped_small_structs(buf: [u8; 16]) { |
| { |
| let w = WithOffset { data: &buf, offset: 0 }; |
| |
| peak_w(&w); |
| use_w(w); |
| } |
| { |
| let w2 = WithOffset { data: &buf, offset: 1 }; |
| |
| peak_w(&w2); |
| use_w(w2); |
| } |
| } |
