| //@ revisions: DEBUGINFO NODEBUGINFO |
| //@ compile-flags: -Zunsound-mir-opts |
| // FIXME: see <https://github.com/rust-lang/rust/issues/132353> |
| //@ compile-flags: -O -Cno-prepopulate-passes |
| //@ [DEBUGINFO] compile-flags: -Cdebuginfo=full |
| |
| // From https://github.com/rust-lang/rust/issues/128081. |
| // Ensure that we only generate a memcpy instruction. |
| |
| #![crate_type = "lib"] |
| |
| #[derive(Clone)] |
| struct SubCloneAndCopy { |
| v1: u32, |
| v2: u32, |
| } |
| |
| #[derive(Clone)] |
| struct CloneOnly { |
| v1: u8, |
| v2: u8, |
| v3: u8, |
| v4: u8, |
| v5: u8, |
| v6: u8, |
| v7: u8, |
| v8: u8, |
| v9: u8, |
| v_sub: SubCloneAndCopy, |
| v_large: [u8; 256], |
| } |
| |
| // CHECK-LABEL: define {{.*}}@clone_only( |
| #[no_mangle] |
| pub fn clone_only(v: &CloneOnly) -> CloneOnly { |
| // CHECK-NOT: call {{.*}}clone |
| // CHECK-NOT: store i8 |
| // CHECK-NOT: store i32 |
| // CHECK: call void @llvm.memcpy |
| // CHECK-NEXT: ret void |
| v.clone() |
| } |
