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Add regression test for #86106

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Signed-off-by: Yuki Okushi <jtitor@2k36.org>
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Yuki Okushi 2022-12-22 20:18:30 +09:00
parent 472651aa10
commit 75f1dfcc32
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1 changed files with 56 additions and 0 deletions
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src/test/codegen/issue-86106.rs Normal file
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// min-llvm-version: 15.0
// compile-flags: -C opt-level=3 -C target-cpu=native
// The below two functions ensure that both `String::new()` and `"".to_string()`
// produce the identical code.
#![crate_type = "lib"]
// CHECK-LABEL: @string_new = unnamed_addr alias void (ptr), ptr @empty_to_string
// CHECK: define void @empty_to_string
#[no_mangle]
pub fn string_new() -> String {
String::new()
}
#[no_mangle]
pub fn empty_to_string() -> String {
// CHECK-NOT: load i8
// CHECK: store i64
// CHECK-NEXT: getelementptr
// CHECK-NEXT: store ptr
// CHECK-NEXT: getelementptr
// CHECK-NOT: store i8
// CHECK-NEXT: store i64
// 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 i64
// CHECK-NOT: load i8
// CHECK-NEXT: getelementptr
// CHECK-NEXT: store ptr
// CHECK-NEXT: getelementptr
// CHECK-NEXT: store i64
// CHECK-NEXT: ret void
vec![]
}
// CHECK-LABEL: @empty_vec_clone
#[no_mangle]
pub fn empty_vec_clone() -> Vec<u8> {
// CHECK: store i64
// CHECK-NOT: load i8
// CHECK-NEXT: getelementptr
// CHECK-NEXT: store ptr
// CHECK-NEXT: getelementptr
// CHECK-NEXT: store i64
// CHECK-NEXT: ret void
vec![].clone()
}