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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/codegen/init-large-type.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/test/ui/codegen/init-large-type.rs b/src/test/ui/codegen/init-large-type.rs new file mode 100644 index 000000000..ce905572f --- /dev/null +++ b/src/test/ui/codegen/init-large-type.rs @@ -0,0 +1,23 @@ +// compile-flags: -O +// run-pass + +#![allow(unused_must_use)] +// Makes sure that zero-initializing large types is reasonably fast, +// Doing it incorrectly causes massive slowdown in LLVM during +// optimisation. + +// pretty-expanded FIXME #23616 +// ignore-emscripten no threads support + +#![feature(intrinsics)] + +use std::{mem, thread}; + +const SIZE: usize = 1024 * 1024; + +fn main() { + // do the test in a new thread to avoid (spurious?) stack overflows + thread::spawn(|| { + let _memory: [u8; SIZE] = unsafe { mem::zeroed() }; + }).join(); +} |