add a test

Author: RalfJung

tests/ui/abi/arm-unadjusted-intrinsic.rs

@@ -0,0 +1,54 @@
+// 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)
+}