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 A previously outdated version of LLVM caused compilation failures and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