mirror of
https://github.com/rust-lang/rust.git
synced 2026-04-27 18:57:42 +03:00
Ohad Ravid
46 lines
1.1 KiB
Rust
46 lines
1.1 KiB
Rust
//@ compile-flags: -Copt-level=3
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#![crate_type = "lib"]
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// Non-overlapping scopes should produce correct llvm.lifetimes,
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// which allow reuse of the same stack allocation.
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pub struct WithOffset<T> {
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pub data: T,
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pub offset: usize,
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}
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#[inline(never)]
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pub fn peak_w(w: &WithOffset<&[u8; 16]>) {
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std::hint::black_box(w);
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}
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#[inline(never)]
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pub fn use_w(w: WithOffset<&[u8; 16]>) {
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std::hint::black_box(w);
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}
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// CHECK-LABEL: @scoped_small_structs
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// CHECK-NEXT: start:
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// CHECK-NEXT: [[B:%.*]] = alloca
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// CHECK-NEXT: [[A:%.*]] = alloca
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// CHECK: call void @llvm.lifetime.start.p0({{(i64 16, )?}}ptr {{.*}}[[A]])
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// CHECK: call void @llvm.lifetime.end.p0({{(i64 16, )?}}ptr {{.*}}[[A]])
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// CHECK: call void @llvm.lifetime.start.p0({{(i64 16, )?}}ptr {{.*}}[[B]])
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// CHECK: call void @llvm.lifetime.end.p0({{(i64 16, )?}}ptr {{.*}}[[B]])
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#[no_mangle]
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pub fn scoped_small_structs(buf: [u8; 16]) {
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{
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let w = WithOffset { data: &buf, offset: 0 };
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peak_w(&w);
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use_w(w);
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}
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{
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let w2 = WithOffset { data: &buf, offset: 1 };
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peak_w(&w2);
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use_w(w2);
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}
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}
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