rust/src/test/codegen/abi-repr-ext.rs

#![crate_type="lib"]

#[repr(i8)]
pub enum Type {
    Type1 = 0,
    Type2 = 1
}

// CHECK: define{{( dso_local)?}} signext i8 @test()
#[no_mangle]
pub extern "C" fn test() -> Type {
    Type::Type1
}
Consider Scalar to be a bool only if its unsigned This seems right, given that conceptually bools are unsigned, but the implications of this change may have more action at distance that I'm not sure how to exhaustively consider. For instance there are a number of cases where code attaches range metadata if `scalar.is_bool()` holds. Supposedly it would no longer be attached to the `repr(i8)` enums? Though I'm not sure why booleans are being special-cased here in the first place... Fixes #80556 2020-12-31 18:02:52 +02:00			`#![crate_type="lib"]`

			`#[repr(i8)]`
			`pub enum Type {`
			`Type1 = 0,`
			`Type2 = 1`
			`}`

Manually set dso_local when its valid to do so This should have no real effect in most cases, as e.g. `hidden` visibility already implies `dso_local` (or at least LLVM IR does not preserve the `dso_local` setting if the item is already `hidden`), but it should fix `-Crelocation-model=static` and improve codegen in executables. Note that this PR does not exhaustively port the logic in [clang]. Only the obviously correct portion and what is necessary to fix a regression from LLVM 12 that relates to `-Crelocation_model=static`. Fixes #83335 [clang]: https://github.com/llvm/llvm-project/blob/3001d080c813da20b329303bf8f45451480e5905/clang/lib/CodeGen/CodeGenModule.cpp#L945-L1039 2021-03-28 00:11:24 +02:00			`// CHECK: define{{( dso_local)?}} signext i8 @test()`
Consider Scalar to be a bool only if its unsigned This seems right, given that conceptually bools are unsigned, but the implications of this change may have more action at distance that I'm not sure how to exhaustively consider. For instance there are a number of cases where code attaches range metadata if `scalar.is_bool()` holds. Supposedly it would no longer be attached to the `repr(i8)` enums? Though I'm not sure why booleans are being special-cased here in the first place... Fixes #80556 2020-12-31 18:02:52 +02:00			`#[no_mangle]`
			`pub extern "C" fn test() -> Type {`
			`Type::Type1`
			`}`