Change:
<ins> // build-pass // revisions: arm //[arm] compile-flags: --target arm-unknown-linux-gnueabi //[arm] needs-llvm-components: arm // revisions: aarch64 //[aarch64] compile-flags: --target aarch64-unknown-linux-gnu //[aarch64] needs-llvm-components: aarch64 #![feature( no_core, lang_items, link_llvm_intrinsics, abi_unadjusted, repr_simd, arm_target_feature, )] #![no_std] #![no_core] #![crate_type = "lib"] #![allow(non_camel_case_types)] /// To work cross-target this test must be no_core. /// This little prelude supplies what we need. #[lang = "sized"] pub trait Sized {} #[lang = "copy"] pub trait Copy: Sized {} impl Copy for i8 {} impl<T: ?Sized> Copy for *const T {} impl<T: ?Sized> Copy for *mut T {} // Regression test for https://github.com/rust-lang/rust/issues/118124. #[repr(simd)] pub struct int8x16_t( pub(crate) i8, pub(crate) i8, pub(crate) i8, pub(crate) i8, pub(crate) i8, pub(crate) i8, pub(crate) i8, pub(crate) i8, pub(crate) i8, pub(crate) i8, pub(crate) i8, pub(crate) i8, pub(crate) i8, pub(crate) i8, pub(crate) i8, pub(crate) i8, ); impl Copy for int8x16_t {} #[repr(C)] pub struct int8x16x4_t(pub int8x16_t, pub int8x16_t, pub int8x16_t, pub int8x16_t); impl Copy for int8x16x4_t {} #[target_feature(enable = "neon")] #[cfg_attr(target_arch = "arm", target_feature(enable = "v7"))] pub unsafe fn vld1q_s8_x4(a: *const i8) -> int8x16x4_t { #[allow(improper_ctypes)] extern "unadjusted" { #[cfg_attr(target_arch = "arm", link_name = "llvm.arm.neon.vld1x4.v16i8.p0i8")] #[cfg_attr(target_arch = "aarch64", link_name = "llvm.aarch64.neon.ld1x4.v16i8.p0i8")] fn vld1q_s8_x4_(a: *const i8) -> int8x16x4_t; } vld1q_s8_x4_(a) } </ins>

Discussion:
Crate bytecount compilation fails with latest nightly on NanoPC-T6 (RK3588 ARM / aarch64). It worked yesterday. I tried this code: Updating index Adding bytecount v0.6.7 to dependencies. Features: generic-simd htmlreport packedsimd runtime-dispatch-simd Updating index Compiling bytecount v0.6.7 Intrinsic has incorrect return type! ptr in function ZN4core9corearch10armshared4neon9generated11vld1qu8x417hd6e0965b4ff7ff22E LLVM ERROR: Broken function found, compilation aborted! error: could not compile (lib) Compiling bytecount v0.6.7 Compiling bytecounttest v0.1.0 (/home/pi/bytecounttest) Finished dev [unoptimized + debuginfo] target(s) in 0.90s Linux NanoPC-T6 5.10.160 SMP Thu Jul 20 15:53:55 CST 2023 aarch64 aarch64 aarch64 GNU/Linux PRETTYNAME="Ubuntu 22.04.3 LTS" NAME="Ubuntu" VERSIONID="22.04" VERSION="22.04.3 LTS (Jammy Jellyfish)" VERSIONCODENAME=jammy ID=ubuntu IDLIKE=debian HOMEURL="" SUPPORTURL="" BUGREPORTURL="" PRIVACYPOLICYURL="" UBUNTUCODENAME=jammy I expected to see this happen: Finished dev [unoptimized + debuginfo] target(s) in 1.32s Instead, this happened: LLVM ERROR: Broken function found, compilation aborted!
searched nightlies: from nightly-2023-11-19 to nightly-2023-11-20 regressed nightly: nightly-2023-11-20 searched commit range: regressed commit: <details<summarybisected with <a href=''cargo-bisect-rustc</av0.6.5</summaryHost triple: aarch64-unknown-linux-gnu Reproduce with: </detailslooks like something in that PR changed ABI behavior and now LLVM and rustc disagree. Don't know who's wrong.
Hm, I don't know how that "unadjusted" ABI stuff works...
should fix this. I am not sure how to add a test.
WG-prioritization assigning priority (). label -I-prioritize +P-high