| //! Test that opt-level=z produces correct code on Windows MSVC targets. |
| //! |
| //! A previously outdated version of LLVM caused compilation failures and |
| //! generated invalid code on Windows specifically with optimization level `z`. |
| //! The bug manifested as corrupted base pointers due to incorrect register |
| //! usage in the generated assembly (e.g., `popl %esi` corrupting local variables). |
| //! After updating to a more recent LLVM version, this test ensures that |
| //! compilation and execution both succeed with opt-level=z. |
| //! |
| //! Regression test for <https://github.com/rust-lang/rust/issues/45034>. |
| |
| //@ ignore-cross-compile |
| // Reason: the compiled binary is executed |
| //@ only-windows |
| // Reason: the observed bug only occurred on Windows MSVC targets |
| //@ run-pass |
| //@ compile-flags: -C opt-level=z |
| |
| #![feature(test)] |
| extern crate test; |
| |
| fn foo(x: i32, y: i32) -> i64 { |
| (x + y) as i64 |
| } |
| |
| #[inline(never)] |
| fn bar() { |
| let _f = Box::new(0); |
| // This call used to trigger an LLVM bug in opt-level=z where the base |
| // pointer gets corrupted due to incorrect register allocation |
| let y: fn(i32, i32) -> i64 = test::black_box(foo); |
| test::black_box(y(1, 2)); |
| } |
| |
| fn main() { |
| bar(); |
| } |
