`rustc` produces SIGILL for `_mm_movemask_epi8` on x86_64-uefi

[usamoi]

Code

fn f(a: core::arch::x86_64::__m128i) -> i32 {
    unsafe { core::arch::x86_64::_mm_movemask_epi8(a) }
}

fn main() {
    println!("ptr = {:#p}", f as *const ());
}

cargo build --target x86_64-unknown-uefi

Meta

rustc --version --verbose:

rustc 1.90.0 (1159e78c4 2025-09-14)
binary: rustc
commit-hash: 1159e78c4747b02ef996e55082b704c09b970588
commit-date: 2025-09-14
host: x86_64-unknown-linux-gnu
release: 1.90.0
LLVM version: 20.1.8

Error output

error: rustc interrupted by SIGILL, printing backtrace

Backtrace

   Compiling rr v0.1.0 (/usamoi/playground/rr)
error: rustc interrupted by SIGILL, printing backtrace

/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-890dfd19c9b338c0.so(+0x3c83a9f) [0x7fb67fa83a9f]
/usr/lib/libc.so.6(+0x3e540) [0x7fb67ba3e540]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM.so.20.1-rust-1.90.0-stable(+0x914f33b) [0x7fb67af4f33b]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM.so.20.1-rust-1.90.0-stable(_ZNK4llvm14TargetLowering21LowerOperationWrapperEPNS_6SDNodeERNS_15SmallVectorImplINS_7SDValueEEERNS_12SelectionDAGE+0x19) [0x7fb67a47d021]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM.so.20.1-rust-1.90.0-stable(+0x867b4b8) [0x7fb67a47b4b8]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM.so.20.1-rust-1.90.0-stable(+0x88c1664) [0x7fb67a6c1664]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM.so.20.1-rust-1.90.0-stable(_ZN4llvm12SelectionDAG13LegalizeTypesEv+0x33b) [0x7fb679c644fb]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM.so.20.1-rust-1.90.0-stable(_ZN4llvm16SelectionDAGISel17CodeGenAndEmitDAGEv+0x8d) [0x7fb679c6468d]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM.so.20.1-rust-1.90.0-stable(_ZN4llvm16SelectionDAGISel20SelectAllBasicBlocksERKNS_8FunctionE+0x1867) [0x7fb679e3eee7]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM.so.20.1-rust-1.90.0-stable(_ZN4llvm16SelectionDAGISel20runOnMachineFunctionERNS_15MachineFunctionE+0x3c4) [0x7fb679e8f7c4]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM.so.20.1-rust-1.90.0-stable(_ZN4llvm22SelectionDAGISelLegacy20runOnMachineFunctionERNS_15MachineFunctionE+0x254) [0x7fb679c32314]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM.so.20.1-rust-1.90.0-stable(_ZN4llvm13FPPassManager13runOnFunctionERNS_8FunctionE+0x8f2) [0x7fb679c2dc32]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM.so.20.1-rust-1.90.0-stable(_ZN4llvm13FPPassManager11runOnModuleERNS_6ModuleE+0x2f) [0x7fb679c2d285]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/libLLVM.so.20.1-rust-1.90.0-stable(_ZN4llvm6legacy15PassManagerImpl3runERNS_6ModuleE+0x2c4) [0x7fb67a1edad8]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-890dfd19c9b338c0.so(+0x654b5c2) [0x7fb68234b5c2]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-890dfd19c9b338c0.so(+0x654b137) [0x7fb68234b137]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-890dfd19c9b338c0.so(+0x654cafe) [0x7fb68234cafe]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-890dfd19c9b338c0.so(_RINvNtNtCscKkwsb9kWaL_3std3sys9backtrace28___rust_begin_short_backtraceNCINvXs0_CsJjGP0MPhtX_18rustc_codegen_llvmNtB1g_18LlvmCodegenBackendNtNtNtCsc5lr08gZmv6_17rustc_codegen_ssa6traits7backend19ExtraBackendMethods18spawn_named_threadNCINvNtNtB2j_4back5write10spawn_workB1N_E0uE0uEB1g_+0x21d) [0x7fb682350925]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-890dfd19c9b338c0.so(+0x65768c7) [0x7fb6823768c7]
/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/librustc_driver-890dfd19c9b338c0.so(+0x657a7c5) [0x7fb68237a7c5]
/usr/lib/libc.so.6(+0x969cb) [0x7fb67ba969cb]
/usr/lib/libc.so.6(+0x11aa0c) [0x7fb67bb1aa0c]

note: we would appreciate a report at https://github.com/rust-lang/rust
note: backtrace dumped due to SIGILL! resuming signal
error: could not compile `rr` (bin "rr")

Caused by:
  process didn't exit successfully: `/home/usamoi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/bin/rustc --crate-name rr --edition=2024 src/main.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --diagnostic-width=167 --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values())' -C metadata=80794f4dba326966 -C extra-filename=-70d72ea00939dbc5 --out-dir /usamoi/playground/rr/target/x86_64-unknown-uefi/debug/deps --target x86_64-unknown-uefi -C incremental=/usamoi/playground/rr/target/x86_64-unknown-uefi/debug/incremental -L dependency=/usamoi/playground/rr/target/x86_64-unknown-uefi/debug/deps -L dependency=/usamoi/playground/rr/target/debug/deps` (signal: 4, SIGILL: illegal instruction)

[folkertdev]

This reproduces with LLVM 21 but is already fixed on LLVM trunk, https://godbolt.org/z/5foxGjezb (if you change the llc version to trunk it emits assembly, on llvm 21 it hits a sigill.

So I think there is nothing that can be done here except wait for the LLVM fix to trickle down to rustc.