Use local core_arch and switch to clang-12

Author: JamieCunliffe

ci/docker/aarch64-unknown-linux-gnu/Dockerfile

@@ -10,7 +10,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   qemu-user \
   make \
   file \
-  clang-9 \
+  clang-12 \
   lld
 
 ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc \

ci/run.sh

@@ -115,7 +115,7 @@ esac
 
 if [ "${TARGET}" = "aarch64-unknown-linux-gnu" ]; then
     export CPPFLAGS="-fuse-ld=lld -I/usr/aarch64-linux-gnu/include/ -I/usr/aarch64-linux-gnu/include/c++/9/aarch64-linux-gnu/"
-    cargo run ${INTRINSIC_TEST} --release --bin intrinsic-test -- crates/intrinsic-test/neon-intrinsics.csv --runner "${CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_RUNNER}" --cppcompiler "clang++-9"
+    cargo run ${INTRINSIC_TEST} --release --bin intrinsic-test -- crates/intrinsic-test/neon-intrinsics.csv --runner "${CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_RUNNER}" --cppcompiler "clang++-12"
 fi
 
 if [ "$NORUN" != "1" ] && [ "$NOSTD" != 1 ]; then

crates/intrinsic-test/src/main.rs

@@ -70,7 +70,7 @@ fn generate_rust_program(intrinsic: &Intrinsic) -> String {
 #![feature(link_llvm_intrinsics)]
 #![feature(stdsimd)]
 #![allow(overflowing_literals)]
-use core::arch::aarch64::*;
+use core_arch::arch::aarch64::*;
 
 fn main() {{
 {passes}
@@ -159,6 +159,8 @@ version = "{version}"
 authors = ["{authors}"]
 edition = "2018"
 [workspace]
+[dependencies]
+core_arch = {{ path = "../crates/core_arch" }}
 {binaries}"#,
                 version = env!("CARGO_PKG_VERSION"),
                 authors = env!("CARGO_PKG_AUTHORS"),
@@ -288,6 +290,11 @@ fn main() {
                 .is_none()
         })
         .filter(|i| i.arguments.iter().find(|a| a.name == "n").is_none())
+        // clang-12 fails to compile this intrinsic due to an error.
+        // fatal error: error in backend: Cannot select: 0x2b99c30: i64 = AArch64ISD::VSHL Constant:i64<1>, Constant:i32<1>
+        // 0x2b9a520: i64 = Constant<1>
+        // 0x2b9a248: i32 = Constant<1>
+        .filter(|i| !["vshld_s64", "vshld_u64"].contains(&i.name.as_str()))
         .collect::<Vec<_>>();
     intrinsics.dedup();