21 lines
814 B
Rust
21 lines
814 B
Rust
// intrinsics::unreachable tells the compiler that a certain point in the code
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// is not reachable by any means, which enables some useful optimizations.
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// In this test, exit-unreachable contains this instruction and exit-ret does not,
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// which means the emitted artifacts should be shorter in length.
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// See https://github.com/rust-lang/rust/pull/16970
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//@ needs-asm-support
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//@ ignore-windows
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// Reason: Because of Windows exception handling, the code is not necessarily any shorter.
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use run_make_support::{rfs, rustc};
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fn main() {
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rustc().opt().emit("asm").input("exit-ret.rs").run();
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rustc().opt().emit("asm").input("exit-unreachable.rs").run();
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assert!(
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rfs::read_to_string("exit-unreachable.s").lines().count()
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< rfs::read_to_string("exit-ret.s").lines().count()
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);
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}
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