Add autocast tests

 - Correct usage of invalid intrinsics in tests

Author: sayantn

tests/run-make/simd-ffi/simd.rs

@@ -35,7 +35,7 @@ extern "C" {
     fn integer(a: i32x4, b: i32x4) -> i32x4;
     // vmaxq_s32
     #[cfg(target_arch = "aarch64")]
-    #[link_name = "llvm.aarch64.neon.maxs.v4i32"]
+    #[link_name = "llvm.aarch64.neon.smax.v4i32"]
     fn integer(a: i32x4, b: i32x4) -> i32x4;
 
     // Use a generic LLVM intrinsic to do type checking on other platforms

tests/ui/codegen/deprecated-llvm-intrinsic.rs

@@ -0,0 +1,28 @@
+//@ add-core-stubs
+//@ build-pass
+//@ ignore-pass
+//@ compile-flags: --target aarch64-unknown-linux-gnu
+//@ needs-llvm-components: aarch64
+#![feature(no_core, lang_items, link_llvm_intrinsics, abi_unadjusted, repr_simd, simd_ffi)]
+#![no_std]
+#![no_core]
+#![allow(internal_features, non_camel_case_types, improper_ctypes)]
+#![crate_type = "lib"]
+
+extern crate minicore;
+use minicore::*;
+
+#[repr(simd)]
+pub struct i8x8([i8; 8]);
+
+extern "unadjusted" {
+    #[link_name = "llvm.aarch64.neon.rbit.v8i8"]
+    fn foo(a: i8x8) -> i8x8;
+}
+
+#[target_feature(enable = "neon")]
+pub unsafe fn bar(a: i8x8) -> i8x8 {
+    foo(a)
+}
+
+//~? NOTE: Using deprecated intrinsic `llvm.aarch64.neon.rbit.v8i8`, `llvm.bitreverse.v8i8` can be used instead

tests/ui/codegen/deprecated-llvm-intrinsic.stderr

@@ -0,0 +1,2 @@
+note: Using deprecated intrinsic `llvm.aarch64.neon.rbit.v8i8`, `llvm.bitreverse.v8i8` can be used instead
+

tests/ui/codegen/incorrect-llvm-intrinsic-signature.rs

@@ -0,0 +1,15 @@
+//@ build-fail
+
+#![feature(link_llvm_intrinsics, abi_unadjusted)]
+#![allow(internal_features, non_camel_case_types, improper_ctypes)]
+
+extern "unadjusted" {
+    #[link_name = "llvm.assume"]
+    fn foo();
+}
+
+pub fn main() {
+    unsafe { foo() }
+}
+
+//~? ERROR: Intrinsic signature mismatch for `llvm.assume`: expected signature `void (i1)`

tests/ui/codegen/incorrect-llvm-intrinsic-signature.stderr

@@ -0,0 +1,4 @@
+error: Intrinsic signature mismatch for `llvm.assume`: expected signature `void (i1)`
+
+error: aborting due to 1 previous error
+

tests/ui/codegen/invalid-llvm-intrinsic.rs

@@ -0,0 +1,15 @@
+//@ build-fail
+
+#![feature(link_llvm_intrinsics, abi_unadjusted)]
+#![allow(internal_features, non_camel_case_types, improper_ctypes)]
+
+extern "unadjusted" {
+    #[link_name = "llvm.abcde"]
+    fn foo();
+}
+
+pub fn main() {
+    unsafe { foo() }
+}
+
+//~? ERROR: Invalid LLVM intrinsic: `llvm.abcde`

tests/ui/codegen/invalid-llvm-intrinsic.stderr

@@ -0,0 +1,4 @@
+error: Invalid LLVM intrinsic: `llvm.abcde`
+
+error: aborting due to 1 previous error
+