ice: None, asm - Githubissues

auto-reduced (treereduce-rust):

#![crate_type = "rlib"]

use std::arch::asm;
use std::mem::MaybeUninit;

pub unsafe fn inout(mut x: i32) -> MaybeUninit<i32> {
    let y: MaybeUninit<i32>;
    asm!("/*{}{}*/", in(reg) x, out(reg) y);
    y
}

original:

// compile-flags: -O
// only-x86_64

#![crate_type = "rlib"]
#![allow(asm_sub_register)]

use std::mem::MaybeUninit;
use std::arch::asm;

// CHECK-LABEL: @int
#[no_mangle]
pub unsafe fn int(x: MaybeUninit<i32>) -> MaybeUninit<i32> {
    let y: MaybeUninit<i32>;
    asm!("/*{}{}*/", in(reg) x, out(reg) y);
    y
}

// CHECK-LABEL: @inout
#[no_mangle]
pub unsafe fn inout(mut x: i32) -> MaybeUninit<i32> {
    let y: MaybeUninit<i32>;
    asm!("/*{}{}*/", in(reg) x, out(reg) y);
    y
}

Version information

rustc 1.76.0-nightly (e24e5af78 2023-11-21)
binary: rustc
commit-hash: e24e5af787f7015914cbf316063ed5821f370b71
commit-date: 2023-11-21
host: x86_64-unknown-linux-gnu
release: 1.76.0-nightly
LLVM version: 17.0.5

Command: /home/matthias/.rustup/toolchains/master/bin/rustc -Zcodegen-backend=cranelift

Program output

``` warning: formatting may not be suitable for sub-register argument --> /tmp/icemaker_global_tempdir.Tt4eJle1ugDg/rustc_testrunner_tmpdir_reporting.vPTLPZ3IgX7I/mvce.rs:8:13 | 8 | asm!("/*{}{}*/", in(reg) x, out(reg) y); | ^^ - for this argument | = help: use `{0:e}` to have the register formatted as `eax` = help: or use `{0:r}` to keep the default formatting of `rax` = note: `#[warn(asm_sub_register)]` on by default warning: formatting may not be suitable for sub-register argument --> /tmp/icemaker_global_tempdir.Tt4eJle1ugDg/rustc_testrunner_tmpdir_reporting.vPTLPZ3IgX7I/mvce.rs:8:15 | 8 | asm!("/*{}{}*/", in(reg) x, out(reg) y); | ^^ - for this argument | = help: use `{1:e}` to have the register formatted as `eax` = help: or use `{1:r}` to keep the default formatting of `rax` warning: variable does not need to be mutable --> /tmp/icemaker_global_tempdir.Tt4eJle1ugDg/rustc_testrunner_tmpdir_reporting.vPTLPZ3IgX7I/mvce.rs:6:21 | 6 | pub unsafe fn inout(mut x: i32) -> MaybeUninit { | ----^ | | | help: remove this `mut` | = note: `#[warn(unused_mut)]` on by default thread 'rustc' panicked at src/inline_asm.rs:764:45: called `Option::unwrap()` on a `None` value stack backtrace: 0: 0x7f0ae758aafc - std::backtrace_rs::backtrace::libunwind::trace::h0b040baf97a1a814 at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5 1: 0x7f0ae758aafc - std::backtrace_rs::backtrace::trace_unsynchronized::h3bb4f35c883ef0b7 at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 2: 0x7f0ae758aafc - std::sys_common::backtrace::_print_fmt::h7bc4c6c40e2dea38 at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/std/src/sys_common/backtrace.rs:68:5 3: 0x7f0ae758aafc - ::fmt::ha29c192b6f9a05c7 at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/std/src/sys_common/backtrace.rs:44:22 4: 0x7f0ae75ddc80 - core::fmt::rt::Argument::fmt::hd5d7e2c681722c4a at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/core/src/fmt/rt.rs:142:9 5: 0x7f0ae75ddc80 - core::fmt::write::h44f28bd6729c28a7 at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/core/src/fmt/mod.rs:1120:17 6: 0x7f0ae757e91f - std::io::Write::write_fmt::h34e80b21f77f27fe at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/std/src/io/mod.rs:1762:15 7: 0x7f0ae758a8e4 - std::sys_common::backtrace::_print::hf6fce87ec4803f0c at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/std/src/sys_common/backtrace.rs:47:5 8: 0x7f0ae758a8e4 - std::sys_common::backtrace::print::h2c7cd590dc94a621 at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/std/src/sys_common/backtrace.rs:34:9 9: 0x7f0ae758d577 - std::panicking::default_hook::{{closure}}::ha2265235df34f52e 10: 0x7f0ae758d2df - std::panicking::default_hook::ha134722f286c6b3a at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/std/src/panicking.rs:292:9 11: 0x7f0aea2f42b0 - std[9e66bc0d43e7428]::panicking::update_hook::>::{closure#0} 12: 0x7f0ae758dcb8 - as core::ops::function::Fn>::call::h3506115e7630eb0e at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/alloc/src/boxed.rs:2021:9 13: 0x7f0ae758dcb8 - std::panicking::rust_panic_with_hook::h7694bf37e5dc3efe at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/std/src/panicking.rs:783:13 14: 0x7f0ae758d9d9 - std::panicking::begin_panic_handler::{{closure}}::h2dd4c764b0c8af53 at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/std/src/panicking.rs:649:13 15: 0x7f0ae758afc6 - std::sys_common::backtrace::__rust_end_short_backtrace::h7c23b4f1d73ba22d at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/std/src/sys_common/backtrace.rs:171:18 16: 0x7f0ae758d772 - rust_begin_unwind at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/std/src/panicking.rs:645:5 17: 0x7f0ae75da365 - core::panicking::panic_fmt::hc4f69c74680b17c4 at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/core/src/panicking.rs:72:14 18: 0x7f0ae75da403 - core::panicking::panic::hafadf320ec949d41 at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/core/src/panicking.rs:127:5 19: 0x7f0addc2b6cf - rustc_codegen_cranelift[5ecdc7bd26b881e3]::inline_asm::codegen_inline_asm_inner 20: 0x7f0addc031fd - rustc_codegen_cranelift[5ecdc7bd26b881e3]::base::codegen_fn_body 21: 0x7f0addc17934 - rustc_codegen_cranelift[5ecdc7bd26b881e3]::driver::aot::module_codegen::{closure#0} 22: 0x7f0addc14c45 - rustc_codegen_cranelift[5ecdc7bd26b881e3]::driver::aot::module_codegen 23: 0x7f0addc2124c - rustc_codegen_cranelift[5ecdc7bd26b881e3]::driver::aot::run_aot 24: 0x7f0addc4d59a - ::codegen_crate 25: 0x7f0aebf669d7 - rustc_interface[79d196cce7f623b3]::passes::start_codegen 26: 0x7f0aebf66399 - ::ongoing_codegen 27: 0x7f0aec6136c7 - rustc_interface[79d196cce7f623b3]::interface::run_compiler::, rustc_driver_impl[6d46853ed3c470a0]::run_compiler::{closure#0}>::{closure#0} 28: 0x7f0aec5a3054 - std[9e66bc0d43e7428]::sys_common::backtrace::__rust_begin_short_backtrace::, rustc_driver_impl[6d46853ed3c470a0]::run_compiler::{closure#0}>::{closure#0}, core[4409ec5cd92597ed]::result::Result<(), rustc_span[433598ff900853dd]::ErrorGuaranteed>>::{closure#0}, core[4409ec5cd92597ed]::result::Result<(), rustc_span[433598ff900853dd]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[4409ec5cd92597ed]::result::Result<(), rustc_span[433598ff900853dd]::ErrorGuaranteed>> 29: 0x7f0aec5a2e7d - <::spawn_unchecked_, rustc_driver_impl[6d46853ed3c470a0]::run_compiler::{closure#0}>::{closure#0}, core[4409ec5cd92597ed]::result::Result<(), rustc_span[433598ff900853dd]::ErrorGuaranteed>>::{closure#0}, core[4409ec5cd92597ed]::result::Result<(), rustc_span[433598ff900853dd]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[4409ec5cd92597ed]::result::Result<(), rustc_span[433598ff900853dd]::ErrorGuaranteed>>::{closure#1} as core[4409ec5cd92597ed]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} 30: 0x7f0ae7597b75 - as core::ops::function::FnOnce>::call_once::he2fe898dabd7bf63 at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/alloc/src/boxed.rs:2007:9 31: 0x7f0ae7597b75 - as core::ops::function::FnOnce>::call_once::h2e31e36ca472739b at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/alloc/src/boxed.rs:2007:9 32: 0x7f0ae7597b75 - std::sys::unix::thread::Thread::new::thread_start::h72b7daa856b881db at /rustc/e24e5af787f7015914cbf316063ed5821f370b71/library/std/src/sys/unix/thread.rs:108:17 33: 0x7f0ae73889eb - 34: 0x7f0ae740c7cc - 35: 0x0 - error: the compiler unexpectedly panicked. this is a bug. note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md note: rustc 1.76.0-nightly (e24e5af78 2023-11-21) running on x86_64-unknown-linux-gnu note: compiler flags: -Z codegen-backend=cranelift -Z dump-mir-dir=dir query stack during panic: end of query stack warning: 3 warnings emitted ```

rust-lang / rustc_codegen_cranelift

ice: None, asm #1428