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Add test that uninhabited repr(transparent) type has same function return ABI as wrapped type.

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Fix codegen of uninhabited PassMode::Indirect return types.

Add codegen test for uninhabited PassMode::Indirect return types.

Enable optimizations for uninhabited return type codegen test
This commit is contained in:
Zachary S 2025-02-13 13:17:39 -06:00
parent bcfde13d51
commit 58ebf6afdd
3 changed files with 84 additions and 21 deletions
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44
tests/codegen/uninhabited-transparent-return-abi.rs Normal file
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//@ compile-flags: -Copt-level=3
// See https://github.com/rust-lang/rust/issues/135802
#![crate_type = "lib"]
enum Void {}
// Should be ABI-compatible with T, but wasn't prior to the PR adding this test.
#[repr(transparent)]
struct NoReturn<T>(T, Void);
// Returned by invisible reference (in most ABIs)
#[allow(dead_code)]
struct Large(u64, u64, u64);
extern "Rust" {
fn opaque() -> NoReturn<Large>;
fn opaque_with_arg(rsi: u32) -> NoReturn<Large>;
}
// CHECK-LABEL: @test_uninhabited_ret_by_ref
#[no_mangle]
pub fn test_uninhabited_ret_by_ref() {
// CHECK: %_1 = alloca [24 x i8], align {{8|4}}
// CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %_1)
// CHECK-NEXT: call void @opaque(ptr noalias nocapture noundef nonnull sret([24 x i8]) align {{8|4}} dereferenceable(24) %_1) #2
// CHECK-NEXT: unreachable
unsafe {
opaque();
}
}
// CHECK-LABEL: @test_uninhabited_ret_by_ref_with_arg
#[no_mangle]
pub fn test_uninhabited_ret_by_ref_with_arg(rsi: u32) {
// CHECK: %_2 = alloca [24 x i8], align {{8|4}}
// CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %_2)
// CHECK-NEXT: call void @opaque_with_arg(ptr noalias nocapture noundef nonnull sret([24 x i8]) align {{8|4}} dereferenceable(24) %_2, i32 noundef %rsi) #2
// CHECK-NEXT: unreachable
unsafe {
opaque_with_arg(rsi);
}
}