33 lines
909 B
Rust
33 lines
909 B
Rust
//! The `simplify_aggregate_to_copy` mir-opt introduced in
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//! <https://github.com/rust-lang/rust/pull/128299> caused a miscompile because the initial
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//! implementation
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//!
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//! > introduce[d] new dereferences without checking for aliasing
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//!
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//! This test demonstrates the behavior, and should be adjusted or removed when fixing and relanding
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//! the mir-opt.
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#![crate_type = "lib"]
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// skip-filecheck
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//@ compile-flags: -O -Zunsound-mir-opts
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//@ test-mir-pass: GVN
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#![allow(internal_features)]
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#![feature(rustc_attrs, core_intrinsics)]
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// EMIT_MIR simplify_aggregate_to_copy_miscompile.foo.GVN.diff
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#[no_mangle]
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fn foo(v: &mut Option<i32>) -> Option<i32> {
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if let &Some(col) = get(&v) {
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*v = None;
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return Some(col);
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} else {
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unsafe { std::intrinsics::unreachable() }
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}
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}
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#[no_mangle]
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#[inline(never)]
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#[rustc_nounwind]
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fn get(v: &Option<i32>) -> &Option<i32> {
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v
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}
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