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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/issues/issue-39827.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-39827.rs b/src/test/ui/issues/issue-39827.rs new file mode 100644 index 000000000..782c668c8 --- /dev/null +++ b/src/test/ui/issues/issue-39827.rs @@ -0,0 +1,34 @@ +// run-pass +#![feature(core_intrinsics)] + +use std::intrinsics::{ volatile_copy_memory, volatile_store, volatile_load, + volatile_copy_nonoverlapping_memory, + volatile_set_memory }; + +// +// This test ensures that volatile intrinsics can be specialised with +// zero-sized types and, in case of copy/set functions, can accept +// number of elements equal to zero. +// +fn main () { + let mut dst_pair = (1, 2); + let src_pair = (3, 4); + let mut dst_empty = (); + let src_empty = (); + + const COUNT_0: usize = 0; + const COUNT_100: usize = 100; + + unsafe { + volatile_copy_memory(&mut dst_pair, &dst_pair, COUNT_0); + volatile_copy_nonoverlapping_memory(&mut dst_pair, &src_pair, 0); + volatile_copy_memory(&mut dst_empty, &dst_empty, 100); + volatile_copy_nonoverlapping_memory(&mut dst_empty, &src_empty, + COUNT_100); + volatile_set_memory(&mut dst_empty, 0, COUNT_100); + volatile_set_memory(&mut dst_pair, 0, COUNT_0); + volatile_store(&mut dst_empty, ()); + volatile_store(&mut dst_empty, src_empty); + volatile_load(&src_empty); + } +} |