nordic-dev.net/rust
nordic-dev.net/rust
2
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2025-01-24 13:43:04 +00:00
Code Issues Packages Projects Releases Wiki Activity

Auto merge of #106036 - JohnTitor:issue-86106, r=nikic

Browse Source 
Add regression test for #86106

Closes #86106
r? `@nikic`

Signed-off-by: Yuki Okushi <jtitor@2k36.org>
This commit is contained in:
bors 2023-01-07 19:26:25 +00:00
commit ee0412d1ef
1 changed files with 62 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
src/test/codegen/issue-86106.rs Normal file
View File

@ -0,0 +1,62 @@
// min-llvm-version: 15.0
// 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-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 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()
}