[Clang][CUDA] Disable diagnostics for neon attrs for GPU-side CUDA compilation

Disable diagnostics for neon attributes for GPU-side CUDA compilation.

Test plan: ninja check-all

Differential revision: https://reviews.llvm.org/D152403

Author: alexander-shaposhnikov

clang/lib/Sema/SemaType.cpp

@@ -8169,19 +8169,27 @@ static bool verifyValidIntegerConstantExpr(Sema &S, const ParsedAttr &Attr,
 /// match one of the standard Neon vector types.
 static void HandleNeonVectorTypeAttr(QualType &CurType, const ParsedAttr &Attr,
                                      Sema &S, VectorType::VectorKind VecKind) {
+  bool IsTargetCUDAAndHostARM = false;
+  if (S.getLangOpts().CUDAIsDevice) {
+    const TargetInfo *AuxTI = S.getASTContext().getAuxTargetInfo();
+    IsTargetCUDAAndHostARM =
+        AuxTI && (AuxTI->getTriple().isAArch64() || AuxTI->getTriple().isARM());
+  }
+
   // Target must have NEON (or MVE, whose vectors are similar enough
   // not to need a separate attribute)
-  if (!S.Context.getTargetInfo().hasFeature("neon") &&
-      !S.Context.getTargetInfo().hasFeature("mve")) {
+  if (!(S.Context.getTargetInfo().hasFeature("neon") ||
+        S.Context.getTargetInfo().hasFeature("mve") ||
+        IsTargetCUDAAndHostARM)) {
     S.Diag(Attr.getLoc(), diag::err_attribute_unsupported)
         << Attr << "'neon' or 'mve'";
     Attr.setInvalid();
     return;
   }
   // Check the attribute arguments.
   if (Attr.getNumArgs() != 1) {
-    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << Attr
-                                                                      << 1;
+    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments)
+        << Attr << 1;
     Attr.setInvalid();
     return;
   }
@@ -8191,7 +8199,8 @@ static void HandleNeonVectorTypeAttr(QualType &CurType, const ParsedAttr &Attr,
     return;
 
   // Only certain element types are supported for Neon vectors.
-  if (!isPermittedNeonBaseType(CurType, VecKind, S)) {
+  if (!isPermittedNeonBaseType(CurType, VecKind, S) &&
+      !IsTargetCUDAAndHostARM) {
     S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType;
     Attr.setInvalid();
     return;

clang/test/SemaCUDA/neon-attrs.cu

@@ -0,0 +1,21 @@
+// CPU-side compilation on ARM with neon enabled (no errors expected).
+// RUN: %clang_cc1 -triple arm64-linux-gnu -target-feature +neon -aux-triple nvptx64 -x cuda -fsyntax-only -verify=quiet %s
+
+// CPU-side compilation on ARM with neon disabled.
+// RUN: %clang_cc1 -triple arm64-linux-gnu -target-feature -neon -aux-triple nvptx64 -x cuda -fsyntax-only -verify %s
+
+// GPU-side compilation on ARM (no errors expected).
+// RUN: %clang_cc1 -triple nvptx64 -aux-triple arm64-linux-gnu -fcuda-is-device -x cuda -fsyntax-only -verify=quiet %s
+
+// Regular C++ compilation on ARM with neon enabled (no errors expected).
+// RUN: %clang_cc1 -triple arm64-linux-gnu -target-feature +neon -x c++ -fsyntax-only -verify=quiet %s
+
+// Regular C++ compilation on ARM with neon disabled.
+// RUN: %clang_cc1 -triple arm64-linux-gnu -target-feature -neon -x c++ -fsyntax-only -verify %s
+
+// quiet-no-diagnostics
+typedef __attribute__((neon_vector_type(4))) float float32x4_t;
+// expected-error@-1 {{'neon_vector_type' attribute is not supported on targets missing 'neon' or 'mve'}}
+typedef unsigned char poly8_t;
+typedef __attribute__((neon_polyvector_type(8))) poly8_t poly8x8_t;
+// expected-error@-1 {{'neon_polyvector_type' attribute is not supported on targets missing 'neon' or 'mve'}}