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35 lines
1.2 KiB
Rust
35 lines
1.2 KiB
Rust
// compile-flags: -C opt-level=3 -C no-prepopulate-passes
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// min-llvm-version: 15.0 (for opaque pointers)
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#![crate_type = "lib"]
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// Test for the absence of `readonly` on the argument when it is mutated via `&raw const`.
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// See <https://github.com/rust-lang/rust/issues/111502>.
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// CHECK: i8 @foo(ptr noalias nocapture noundef dereferenceable(128) %x)
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#[no_mangle]
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pub fn foo(x: [u8; 128]) -> u8 {
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let ptr = core::ptr::addr_of!(x).cast_mut();
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unsafe {
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(*ptr)[0] = 1;
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}
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x[0]
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}
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// CHECK: i1 @second(ptr noalias nocapture noundef dereferenceable({{[0-9]+}}) %a_ptr_and_b)
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#[no_mangle]
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pub unsafe fn second(a_ptr_and_b: (*mut (i32, bool), (i64, bool))) -> bool {
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let b_bool_ptr = core::ptr::addr_of!(a_ptr_and_b.1.1).cast_mut();
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(*b_bool_ptr) = true;
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a_ptr_and_b.1.1
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}
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// If going through a deref (and there are no other mutating accesses), then `readonly` is fine.
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// CHECK: i1 @third(ptr noalias nocapture noundef readonly dereferenceable({{[0-9]+}}) %a_ptr_and_b)
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#[no_mangle]
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pub unsafe fn third(a_ptr_and_b: (*mut (i32, bool), (i64, bool))) -> bool {
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let b_bool_ptr = core::ptr::addr_of!((*a_ptr_and_b.0).1).cast_mut();
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(*b_bool_ptr) = true;
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a_ptr_and_b.1.1
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}
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