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// min-llvm-version: 15.0
// only-64bit llvm appears to use stores instead of memset on 32bit
// compile-flags: -C opt-level=3 -Z merge-functions=disabled
// The below two functions ensure that both `String::new()` and `"".to_string()`
// produce the identical code.
#![crate_type = "lib"]
// CHECK-LABEL: define void @string_new
#[no_mangle]
pub fn string_new() -> String {
// CHECK: store ptr inttoptr
// CHECK-NEXT: getelementptr
// CHECK-NEXT: call void @llvm.memset
// CHECK-NEXT: ret void
String::new()
}
// CHECK-LABEL: define void @empty_to_string
#[no_mangle]
pub fn empty_to_string() -> String {
// CHECK: store ptr inttoptr
// CHECK-NEXT: getelementptr
// CHECK-NEXT: call void @llvm.memset
// 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 ptr inttoptr
// CHECK-NEXT: getelementptr
// CHECK-NEXT: call void @llvm.memset
// CHECK-NEXT: ret void
vec![]
}
// CHECK-LABEL: @empty_vec_clone
#[no_mangle]
pub fn empty_vec_clone() -> Vec<u8> {
// CHECK: store ptr inttoptr
// CHECK-NEXT: getelementptr
// CHECK-NEXT: call void @llvm.memset
// CHECK-NEXT: ret void
vec![].clone()
}
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