| //@ only-64bit llvm appears to use stores instead of memset on 32bit |
| //@ compile-flags: -C opt-level=3 -Z merge-functions=disabled |
| //@ needs-deterministic-layouts |
| |
| // The below two functions ensure that both `String::new()` and `"".to_string()` |
| // produce the identical code. |
| |
| #![crate_type = "lib"] |
| |
| // CHECK-LABEL: define {{(dso_local )?}}void @string_new |
| #[no_mangle] |
| pub fn string_new() -> String { |
| // CHECK-NOT: load i8 |
| // CHECK: store i{{32|64}} |
| // CHECK-NEXT: getelementptr |
| // CHECK-NEXT: store ptr |
| // CHECK-NEXT: getelementptr |
| // CHECK-NEXT: store i{{32|64}} |
| // CHECK-NEXT: ret void |
| String::new() |
| } |
| |
| // CHECK-LABEL: define {{(dso_local )?}}void @empty_to_string |
| #[no_mangle] |
| pub fn empty_to_string() -> String { |
| // CHECK-NOT: load i8 |
| // CHECK: store i{{32|64}} |
| // CHECK-NEXT: getelementptr |
| // CHECK-NEXT: store ptr |
| // CHECK-NEXT: getelementptr |
| // CHECK-NEXT: store i{{32|64}} |
| // CHECK-NEXT: ret void |
| "".to_string() |
| } |
| |
| // The below two functions ensure that both `vec![]` and `vec![].clone()` |
| // produce the identical code. |
| |
| // CHECK-LABEL: @empty_vec |
| #[no_mangle] |
| pub fn empty_vec() -> Vec<u8> { |
| // CHECK: store i{{32|64}} |
| // CHECK-NOT: load i8 |
| // CHECK-NEXT: getelementptr |
| // CHECK-NEXT: store ptr |
| // CHECK-NEXT: getelementptr |
| // CHECK-NEXT: store i{{32|64}} |
| // CHECK-NEXT: ret void |
| vec![] |
| } |
| |
| // CHECK-LABEL: @empty_vec_clone |
| #[no_mangle] |
| pub fn empty_vec_clone() -> Vec<u8> { |
| // CHECK: store i{{32|64}} |
| // CHECK-NOT: load i8 |
| // CHECK-NEXT: getelementptr |
| // CHECK-NEXT: store ptr |
| // CHECK-NEXT: getelementptr |
| // CHECK-NEXT: store i{{32|64}} |
| // CHECK-NEXT: ret void |
| vec![].clone() |
| } |
