Closed
Description
The code below does not run correctly under aarch64 on the nightly compiler in debug mode.
Every other combination works (only tried nightly and stable releases).
I minimized the sample as far as I could and verified it on real hardware.
Sorry for the title, I have no clue how to name this issue.
I tried this code:
#[derive(Debug, PartialEq)]
pub struct B {
pub b1: u16,
pub b2: u8,
}
impl B {
fn new(b1: u16, b2: u8) -> B {
B { b1, b2 }
}
}
#[test]
fn welp() {
assert_eq!(B::new(0xDEAD, 0xFE), B { b1: 0xDEAD, b2: 0xFE });
}I expected to see this happen:
$ cargo +nightly test
[...]
test welp ... ok
Instead, this happened:
(qemu-aarch64)
$ cargo +nightly test
[...]
test welp ... thread 'welp' panicked at 'assertion failed: `(left == right)`
left: `B { b1: 0, b2: 0 }`,
right: `B { b1: 57005, b2: 254 }`', src/lib.rs:15:5
(aarch64 cpu)
left: `B { b1: 127, b2: 0 }`,
right: `B { b1: 57005, b2: 254 }`', src/lib.rs:15:5
Meta
You can reproduce this with qemu-user (aarch64) with the following config:
$ cat .cargo/config
[target.aarch64-unknown-linux-gnu]
linker = "aarch64-linux-gnu-gcc"
runner = "qemu-aarch64"
$ LD_LIBRARY_PATH="/usr/aarch64-linux-gnu/lib:$LD_LIBRARY_PATH" cargo +nightly test --target aarch64-unknown-linux-gnu
CPU:
$ lscpu
Architecture: aarch64
Byte Order: Little Endian
[...]
$ cat /proc/cpuinfo
[...]
Features : fp asimd evtstrm aes pmull sha1 sha2 crc32
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4
[...]
rustc --version --verbose:
rustc 1.26.0-nightly (3eeb5a665 2018-03-01)
binary: rustc
commit-hash: 3eeb5a665e313c5b281820099e04d4c6c8188b46
commit-date: 2018-03-01
host: x86_64-unknown-linux-gnu
release: 1.26.0-nightly
LLVM version: 6.0
Edit: smaller example