ice: `asm const cannot be resolved`

[matthiaskrgr]

auto-reduced (treereduce-rust):

#![feature(asm_const)]

use std::arch::{asm, global_asm};

fn main() {}

global_asm!("/* {} */", const 1 / 0);

original:

// only-aarch64
// run-pass
// needs-asm-support

#![feature(asm_const)]

use std::arch::{asm, global_asm};

fn const_generic<const X: usize>() -> usize {
    unsafe {
        let a: usize;
        asm!("mov {}, {}", out(reg) a, const X);
        a
    }
}

const fn constfn(x: usize) -> usize {
    x
}

fn main() {
    unsafe {
        let a: usize;
        asm!("mov {}, {}", out(reg) a, const 5);
        assert_eq!(a, 5);

        let b: usize;
        asm!("mov {}, {}", out(reg) b, const constfn(5));
        assert_eq!(b, 5);

        let c: usize;
        asm!("mov {}, {}", out(reg) c, const constfn(5) + constfn(5));
        assert_eq!(c, 10);
    }

    let d = const_generic::<5>();
    assert_eq!(d, 5);
}

global_asm!("mov x0, {}", const 5);
global_asm!("mov x0, {}", const constfn(5));
global_asm!("/* {} */", const 1 / 0);

Version information

rustc 1.78.0-nightly (340bb19fe 2024-02-14)
binary: rustc
commit-hash: 340bb19fea20fd5f9357bbfac542fad84fc7ea2b
commit-date: 2024-02-14
host: x86_64-unknown-linux-gnu
release: 1.78.0-nightly
LLVM version: 18.1.0

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output

warning: unused import: `asm`
 --> /tmp/icemaker_global_tempdir.2zj7DJPZrPS9/rustc_testrunner_tmpdir_reporting.NjtF3y0XkmX4/mvce.rs:3:17
  |
3 | use std::arch::{asm, global_asm};
  |                 ^^^
  |
  = note: `#[warn(unused_imports)]` on by default

error[E0080]: evaluation of constant value failed
 --> /tmp/icemaker_global_tempdir.2zj7DJPZrPS9/rustc_testrunner_tmpdir_reporting.NjtF3y0XkmX4/mvce.rs:7:31
  |
7 | global_asm!("/* {} */", const 1 / 0);
  |                               ^^^^^ attempt to divide `1_i32` by zero

error: internal compiler error: /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/compiler/rustc_codegen_ssa/src/mono_item.rs:47:41: asm const cannot be resolved
 --> /tmp/icemaker_global_tempdir.2zj7DJPZrPS9/rustc_testrunner_tmpdir_reporting.NjtF3y0XkmX4/mvce.rs:7:25
  |
7 | global_asm!("/* {} */", const 1 / 0);
  |                         ^^^^^^^^^^^

thread 'rustc' panicked at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/compiler/rustc_middle/src/util/bug.rs:34:50:
Box<dyn Any>
stack backtrace:
   0:     0x7f70bbd8ce46 - std::backtrace_rs::backtrace::libunwind::trace::h741b35e6ebf0ea82
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f70bbd8ce46 - std::backtrace_rs::backtrace::trace_unsynchronized::hf3b09a36cbdb818e
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f70bbd8ce46 - std::sys_common::backtrace::_print_fmt::hd9ddcb56e855ae1f
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f70bbd8ce46 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h1d659f3f1b376713
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f70bbddd46c - core::fmt::rt::Argument::fmt::h268aa39b6fb00372
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/core/src/fmt/rt.rs:142:9
   5:     0x7f70bbddd46c - core::fmt::write::h3ca4c8a121ee4a21
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/core/src/fmt/mod.rs:1120:17
   6:     0x7f70bbd8087f - std::io::Write::write_fmt::hbae5643614f30ef5
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/std/src/io/mod.rs:1854:15
   7:     0x7f70bbd8cbf4 - std::sys_common::backtrace::_print::h46251963e880a6db
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f70bbd8cbf4 - std::sys_common::backtrace::print::hf7d8eafd5758e700
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f70bbd8f93b - std::panicking::default_hook::{{closure}}::h762f7d01310422ff
  10:     0x7f70bbd8f689 - std::panicking::default_hook::h6bf045830ee7f539
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/std/src/panicking.rs:292:9
  11:     0x7f70bebf2bac - std[3c399c9137e7035e]::panicking::update_hook::<alloc[b5118abce3d9b84a]::boxed::Box<rustc_driver_impl[aed52aad4ff697f9]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f70bbd900a0 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h183d4d6c4a9f8452
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/alloc/src/boxed.rs:2030:9
  13:     0x7f70bbd900a0 - std::panicking::rust_panic_with_hook::hf47919d70d1ff480
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/std/src/panicking.rs:785:13
  14:     0x7f70bec20264 - std[3c399c9137e7035e]::panicking::begin_panic::<rustc_errors[b0a2db8db751489]::ExplicitBug>::{closure#0}
  15:     0x7f70bec1cbc6 - std[3c399c9137e7035e]::sys_common::backtrace::__rust_end_short_backtrace::<std[3c399c9137e7035e]::panicking::begin_panic<rustc_errors[b0a2db8db751489]::ExplicitBug>::{closure#0}, !>
  16:     0x7f70bec18146 - std[3c399c9137e7035e]::panicking::begin_panic::<rustc_errors[b0a2db8db751489]::ExplicitBug>
  17:     0x7f70bec2bdb1 - <rustc_errors[b0a2db8db751489]::diagnostic_builder::BugAbort as rustc_errors[b0a2db8db751489]::diagnostic_builder::EmissionGuarantee>::emit_producing_guarantee
  18:     0x7f70bea8c63d - rustc_middle[70484f9a8b697519]::util::bug::opt_span_bug_fmt::<rustc_span[193b94924c128396]::span_encoding::Span>::{closure#0}
  19:     0x7f70bea8ca5a - rustc_middle[70484f9a8b697519]::ty::context::tls::with_opt::<rustc_middle[70484f9a8b697519]::util::bug::opt_span_bug_fmt<rustc_span[193b94924c128396]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  20:     0x7f70bea843e8 - rustc_middle[70484f9a8b697519]::ty::context::tls::with_context_opt::<rustc_middle[70484f9a8b697519]::ty::context::tls::with_opt<rustc_middle[70484f9a8b697519]::util::bug::opt_span_bug_fmt<rustc_span[193b94924c128396]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  21:     0x7f70bea826c4 - rustc_middle[70484f9a8b697519]::util::bug::span_bug_fmt::<rustc_span[193b94924c128396]::span_encoding::Span>
  22:     0x7f70c09e0200 - rustc_codegen_llvm[63f401253c7e1412]::base::compile_codegen_unit::module_codegen
  23:     0x7f70c0d26a93 - <rustc_codegen_llvm[63f401253c7e1412]::LlvmCodegenBackend as rustc_codegen_ssa[a586662d15c3dc2]::traits::backend::ExtraBackendMethods>::compile_codegen_unit
  24:     0x7f70c0dac1d7 - rustc_codegen_ssa[a586662d15c3dc2]::base::codegen_crate::<rustc_codegen_llvm[63f401253c7e1412]::LlvmCodegenBackend>
  25:     0x7f70c0dab935 - <rustc_codegen_llvm[63f401253c7e1412]::LlvmCodegenBackend as rustc_codegen_ssa[a586662d15c3dc2]::traits::backend::CodegenBackend>::codegen_crate
  26:     0x7f70c0ddc8ca - rustc_interface[85a46e65fd36dd64]::passes::start_codegen
  27:     0x7f70c0ddc098 - <rustc_interface[85a46e65fd36dd64]::queries::Queries>::codegen_and_build_linker
  28:     0x7f70c0c2e0a8 - rustc_interface[85a46e65fd36dd64]::interface::run_compiler::<core[7e3aa1eb1ad3b865]::result::Result<(), rustc_span[193b94924c128396]::ErrorGuaranteed>, rustc_driver_impl[aed52aad4ff697f9]::run_compiler::{closure#0}>::{closure#0}
  29:     0x7f70c0dc7b58 - std[3c399c9137e7035e]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[85a46e65fd36dd64]::util::run_in_thread_with_globals<rustc_interface[85a46e65fd36dd64]::util::run_in_thread_pool_with_globals<rustc_interface[85a46e65fd36dd64]::interface::run_compiler<core[7e3aa1eb1ad3b865]::result::Result<(), rustc_span[193b94924c128396]::ErrorGuaranteed>, rustc_driver_impl[aed52aad4ff697f9]::run_compiler::{closure#0}>::{closure#0}, core[7e3aa1eb1ad3b865]::result::Result<(), rustc_span[193b94924c128396]::ErrorGuaranteed>>::{closure#0}, core[7e3aa1eb1ad3b865]::result::Result<(), rustc_span[193b94924c128396]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[7e3aa1eb1ad3b865]::result::Result<(), rustc_span[193b94924c128396]::ErrorGuaranteed>>
  30:     0x7f70c0dc7984 - <<std[3c399c9137e7035e]::thread::Builder>::spawn_unchecked_<rustc_interface[85a46e65fd36dd64]::util::run_in_thread_with_globals<rustc_interface[85a46e65fd36dd64]::util::run_in_thread_pool_with_globals<rustc_interface[85a46e65fd36dd64]::interface::run_compiler<core[7e3aa1eb1ad3b865]::result::Result<(), rustc_span[193b94924c128396]::ErrorGuaranteed>, rustc_driver_impl[aed52aad4ff697f9]::run_compiler::{closure#0}>::{closure#0}, core[7e3aa1eb1ad3b865]::result::Result<(), rustc_span[193b94924c128396]::ErrorGuaranteed>>::{closure#0}, core[7e3aa1eb1ad3b865]::result::Result<(), rustc_span[193b94924c128396]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[7e3aa1eb1ad3b865]::result::Result<(), rustc_span[193b94924c128396]::ErrorGuaranteed>>::{closure#1} as core[7e3aa1eb1ad3b865]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  31:     0x7f70bbd991e5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h1516af221a452bc1
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/alloc/src/boxed.rs:2016:9
  32:     0x7f70bbd991e5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hff2a9d52ad89d581
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/alloc/src/boxed.rs:2016:9
  33:     0x7f70bbd991e5 - std::sys::pal::unix::thread::Thread::new::thread_start::hf359248e8c5b2b25
                               at /rustc/340bb19fea20fd5f9357bbfac542fad84fc7ea2b/library/std/src/sys/pal/unix/thread.rs:108:17
  34:     0x7f70bbb809eb - <unknown>
  35:     0x7f70bbc047cc - <unknown>
  36:                0x0 - <unknown>

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 1.78.0-nightly (340bb19fe 2024-02-14) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack
error: aborting due to 2 previous errors; 1 warning emitted

For more information about this error, try `rustc --explain E0080`.

[matthiaskrgr]

Regression in nightly-2021-12-16 lol

commit[0] 2021-12-14: Auto merge of #91902 - matthiaskrgr:rollup-hjjyhow, r=matthiaskrgr
commit[1] 2021-12-14: Auto merge of #91728 - Amanieu:stable_asm, r=joshtriplett
commit[2] 2021-12-15: Auto merge of #91933 - matthiaskrgr:rollup-cw9qolb, r=matthiaskrgr
commit[3] 2021-12-15: Auto merge of #91945 - matthiaskrgr:rollup-jszf9zp, r=matthiaskrgr
commit[4] 2021-12-15: Auto merge of #91752 - yaahc:track-caller-result, r=cuviper
commit[5] 2021-12-15: Auto merge of #91959 - matthiaskrgr:rollup-rhajuvw, r=matthiaskrgr
commit[6] 2021-12-15: Auto merge of #91962 - matthiaskrgr:rollup-2g082jw, r=matthiaskrgr
ERROR: no CI builds available between 404c847 and c5ecc15 within last 167 days
~/vcs/github/rust_bisect via 🦀 v1.78.0-nightly too

I would guess #91728 ? cc @Amanieu

[asquared31415]

Doubt it, that's just when the stabilization happened, there's no meaningful changes there

[asquared31415]

Actually bisects to #84107 which added support for const in global_asm!.

[jieyouxu]

@rustbot label +F-asm +A-inline-assembly +F-inline_const -needs-triage

[asquared31415]

cc #93332

[veera-sivarajan]

@rustbot claim