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https://github.com/rust-lang/rust
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34 lines
1.2 KiB
Rust
34 lines
1.2 KiB
Rust
//@ run-pass
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#![feature(core_intrinsics)]
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use std::intrinsics::{ volatile_copy_memory, volatile_store, volatile_load,
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volatile_copy_nonoverlapping_memory,
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volatile_set_memory };
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//
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// This test ensures that volatile intrinsics can be specialised with
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// zero-sized types and, in case of copy/set functions, can accept
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// number of elements equal to zero.
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//
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fn main () {
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let mut dst_pair = (1, 2);
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let src_pair = (3, 4);
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let mut dst_empty = ();
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let src_empty = ();
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const COUNT_0: usize = 0;
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const COUNT_100: usize = 100;
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unsafe {
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volatile_copy_memory(&mut dst_pair, &dst_pair, COUNT_0);
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volatile_copy_nonoverlapping_memory(&mut dst_pair, &src_pair, 0);
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volatile_copy_memory(&mut dst_empty, &dst_empty, 100);
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volatile_copy_nonoverlapping_memory(&mut dst_empty, &src_empty,
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COUNT_100);
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volatile_set_memory(&mut dst_empty, 0, COUNT_100);
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volatile_set_memory(&mut dst_pair, 0, COUNT_0);
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volatile_store(&mut dst_empty, ());
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volatile_store(&mut dst_empty, src_empty);
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volatile_load(&src_empty);
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}
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}
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