[AAch64] Add the __ARM_FEATURE_DOTPROD macro definition

[flyingforyou]

Summary

This matches what GCC does.
https://github.com/gcc-mirror/gcc/blob/master/gcc/config/aarch64/aarch64-c.c

[SjoerdMeijer]

Hi, thanks for adding this.

Also wanted to confirm that macro __ARM_FEATURE_DOTPROD will defined/included in the next release of the ACLE.

lib/Basic/Targets/AArch64.h

36

Does this need to be initialised (and set to false)?

test/Preprocessor/aarch64-target-features.c

94

Perhaps one additional check it's not enabled?

[flyingforyou]

Addressed SjoerdMeijer' new comments. Thanks.

Also wanted to confirm that macro __ARM_FEATURE_DOTPROD will defined/included in the next release of the ACLE.

Could you check it, please? I saw several codes that use above definition which are written by ARM engineers.

[SjoerdMeijer]

LGTM, thanks.

lib/Basic/Targets/AArch64.h

class LLVM_LIBRARY_VISIBILITY AArch64TargetInfo : public TargetInfo {
 
   enum FPUModeEnum { FPUMode, NeonMode = (1 << 0), SveMode = (1 << 1) };
 
   unsigned FPU;
   unsigned CRC;
   unsigned Crypto;
   unsigned Unaligned;
   unsigned HasFullFP16;
+  unsigned HasDotProd;
   llvm::AArch64::ArchKind ArchKind;
 
   static const Builtin::Info BuiltinInfo[];
 
   std::string ABI;
 
 public:
   AArch64TargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts);

lib/Basic/Targets/AArch64.cpp

void AArch64TargetInfo::getTargetDefines(const LangOptions &Opts,
   if (Unaligned)
     Builder.defineMacro("__ARM_FEATURE_UNALIGNED", "1");
 
   if ((FPU & NeonMode) && HasFullFP16)
     Builder.defineMacro("__ARM_FEATURE_FP16_VECTOR_ARITHMETIC", "1");
   if (HasFullFP16)
    Builder.defineMacro("__ARM_FEATURE_FP16_SCALAR_ARITHMETIC", "1");
 
+  if (HasDotProd)
+    Builder.defineMacro("__ARM_FEATURE_DOTPROD", "1");
+
   switch (ArchKind) {
   default:
     break;
   case llvm::AArch64::ArchKind::ARMV8_1A:
     getTargetDefinesARMV81A(Opts, Builder);
     break;
   case llvm::AArch64::ArchKind::ARMV8_2A:
     getTargetDefinesARMV82A(Opts, Builder);
for (const auto &Feature : Features) {
     if (Feature == "+strict-align")
       Unaligned = 0;
     if (Feature == "+v8.1a")
       ArchKind = llvm::AArch64::ArchKind::ARMV8_1A;
     if (Feature == "+v8.2a")
       ArchKind = llvm::AArch64::ArchKind::ARMV8_2A;
     if (Feature == "+fullfp16")
       HasFullFP16 = 1;
+    if (Feature == "+dotprod")
+      HasDotProd = 1;
   }
 
   setDataLayout();
 
   return true;
 }
 
 TargetInfo::CallingConvCheckResult

test/Preprocessor/aarch64-target-features.c

 // RUN: %clang -target aarch64 -march=armv8-a -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-GENERIC %s
 // CHECK-GENERIC: "-cc1"{{.*}} "-triple" "aarch64{{.*}}" "-target-feature" "+neon"
 
 // RUN: %clang -target aarch64 -mtune=cyclone -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-MTUNE-CYCLONE %s
 
 // RUN: %clang -target aarch64-none-linux-gnu -march=armv8-a+sve -x c -E -dM %s -o - | FileCheck --check-prefix=CHECK-SVE %s
 // CHECK-SVE: __ARM_FEATURE_SVE 1
 
+// RUN: %clang -target aarch64-none-linux-gnu -march=armv8.2a+dotprod -x c -E
+// -dM %s -o - | FileCheck --check-prefix=CHECK-DOTPROD %s
+// CHECK-DOTPROD: __ARM_FEATURE_DOTPROD 1
+
 // RUN: %clang -target aarch64-none-linux-gnueabi -march=armv8.2a+fp16 -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-FULLFP16-VECTOR-SCALAR %s
 // CHECK-FULLFP16-VECTOR-SCALAR: #define __ARM_FEATURE_FP16_SCALAR_ARITHMETIC 1
 // CHECK-FULLFP16-VECTOR-SCALAR: #define __ARM_FEATURE_FP16_VECTOR_ARITHMETIC 1
 // CHECK-FULLFP16-VECTOR-SCALAR: #define __ARM_FP 0xE
 // CHECK-FULLFP16-VECTOR-SCALAR: #define __ARM_FP16_FORMAT_IEEE 1
 
 // RUN: %clang -target aarch64-none-linux-gnueabi -march=armv8.2a+fp16+nosimd -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-FULLFP16-SCALAR %s
 // CHECK-FULLFP16-SCALAR:       #define __ARM_FEATURE_FP16_SCALAR_ARITHMETIC 1