f4aa209e20
Prevent a test from seeing forbidden numbers in the rustc version The final CHECK-NOT directive in this test was able to see past the end of the enclosing function, and find the substring `753` or `754` in the git hash in the rustc version number, causing false failures in CI whenever the git hash happens to contain those digits in sequence. Adding an explicit check for `ret` prevents the CHECK-NOT directive from seeing past the end of the function. --- Manually tested by adding `// CHECK-NOT: rustc` after the existing CHECK-NOT directives, and demonstrating that the new check prevents it from seeing the rustc version string.
44 lines
1012 B
Rust
44 lines
1012 B
Rust
//@ compile-flags: -Copt-level=3
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#![crate_type = "lib"]
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// The bug here was that it was loading and storing the whole value.
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// It's ok for it to load the discriminant,
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// to preserve the UB from `unreachable_unchecked`,
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// but it better only store the constant discriminant of `B`.
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pub enum State {
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A([u8; 753]),
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B([u8; 753]),
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}
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// CHECK-LABEL: @update
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#[no_mangle]
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pub unsafe fn update(s: *mut State) {
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// CHECK-NOT: alloca
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// CHECK-NOT: load
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// CHECK-NOT: store
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// CHECK-NOT: memcpy
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// CHECK-NOT: 75{{3|4}}
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// CHECK: %[[TAG:.+]] = load i8, ptr %s, align 1
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// CHECK-NEXT: trunc nuw i8 %[[TAG]] to i1
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// CHECK-NOT: load
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// CHECK-NOT: store
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// CHECK-NOT: memcpy
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// CHECK-NOT: 75{{3|4}}
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// CHECK: store i8 1, ptr %s, align 1
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// CHECK-NOT: load
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// CHECK-NOT: store
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// CHECK-NOT: memcpy
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// CHECK-NOT: 75{{3|4}}
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// CHECK: ret
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let State::A(v) = s.read() else { std::hint::unreachable_unchecked() };
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s.write(State::B(v));
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}
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