mirror of https://github.com/rust-lang/rust.git
22 lines
695 B
Rust
22 lines
695 B
Rust
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// run-pass
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// only-i686-pc-windows-msvc
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// compile-flags: -Copt-level=0 -Cdebug-assertions=yes
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// MSVC isn't sure if on 32-bit Windows its u64 type is 8-byte-aligned or 4-byte-aligned.
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// So this test ensures that on i686-pc-windows-msvc, we do not insert a runtime check
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// that will fail on dereferencing of a pointer to u64 which is not 8-byte-aligned but is
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// 4-byte-aligned.
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#![feature(strict_provenance)]
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fn main() {
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let mut x = [0u64; 2];
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let ptr: *mut u8 = x.as_mut_ptr().cast::<u8>();
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unsafe {
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let misaligned = ptr.add(4).cast::<u64>();
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assert!(misaligned.addr() % 8 != 0);
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assert!(misaligned.addr() % 4 == 0);
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*misaligned = 42;
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}
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}
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