[NFC][Clang][AArch64]Refactor implementation of Neon vectors MFloat8… (#114804)

…x8 and MFloat8x16

This patch adds MFloat8 as a TypeFlag and Kind on Neon to generate the
typedefs using emitNeonTypeDefs.
It does not need any change in Clang, because SEMA and CodeGen use the
Builtins defined in AArch64SVEACLETypes.def

Author: CarolineConcatto

clang/include/clang/Basic/arm_neon_incl.td

@@ -218,6 +218,7 @@ def OP_UNAVAILABLE : Operation {
 // h: half-float
 // d: double
 // b: bfloat16
+// m: mfloat8
 //
 // Typespec modifiers
 // ------------------

clang/utils/TableGen/NeonEmitter.cpp

@@ -101,7 +101,8 @@ enum EltType {
   Float16,
   Float32,
   Float64,
-  BFloat16
+  BFloat16,
+  MFloat8 // Not used by Sema or CodeGen in Clang
 };
 
 } // end namespace NeonTypeFlags
@@ -143,14 +144,7 @@ class Type {
 private:
   TypeSpec TS;
 
-  enum TypeKind {
-    Void,
-    Float,
-    SInt,
-    UInt,
-    Poly,
-    BFloat16
-  };
+  enum TypeKind { Void, Float, SInt, UInt, Poly, BFloat16, MFloat8 };
   TypeKind Kind;
   bool Immediate, Constant, Pointer;
   // ScalarForMangling and NoManglingQ are really not suited to live here as
@@ -203,6 +197,7 @@ class Type {
   bool isLong() const { return isInteger() && ElementBitwidth == 64; }
   bool isVoid() const { return Kind == Void; }
   bool isBFloat16() const { return Kind == BFloat16; }
+  bool isMFloat8() const { return Kind == MFloat8; }
   unsigned getNumElements() const { return Bitwidth / ElementBitwidth; }
   unsigned getSizeInBits() const { return Bitwidth; }
   unsigned getElementSizeInBits() const { return ElementBitwidth; }
@@ -657,6 +652,8 @@ std::string Type::str() const {
     S += "float";
   else if (isBFloat16())
     S += "bfloat";
+  else if (isMFloat8())
+    S += "mfloat";
   else
     S += "int";
 
@@ -699,6 +696,9 @@ std::string Type::builtin_str() const {
   else if (isBFloat16()) {
     assert(ElementBitwidth == 16 && "BFloat16 can only be 16 bits");
     S += "y";
+  } else if (isMFloat8()) {
+    assert(ElementBitwidth == 8 && "MFloat8 can only be 8 bits");
+    S += "m";
   } else
     switch (ElementBitwidth) {
     case 16: S += "h"; break;
@@ -758,6 +758,10 @@ unsigned Type::getNeonEnum() const {
     Base = (unsigned)NeonTypeFlags::BFloat16;
   }
 
+  if (isMFloat8()) {
+    Base = (unsigned)NeonTypeFlags::MFloat8;
+  }
+
   if (Bitwidth == 128)
     Base |= (unsigned)NeonTypeFlags::QuadFlag;
   if (isInteger() && !isSigned())
@@ -779,6 +783,8 @@ Type Type::fromTypedefName(StringRef Name) {
     T.Kind = Poly;
   } else if (Name.consume_front("bfloat")) {
     T.Kind = BFloat16;
+  } else if (Name.consume_front("mfloat")) {
+    T.Kind = MFloat8;
   } else {
     assert(Name.starts_with("int"));
     Name = Name.drop_front(3);
@@ -879,6 +885,10 @@ void Type::applyTypespec(bool &Quad) {
       Kind = BFloat16;
       ElementBitwidth = 16;
       break;
+    case 'm':
+      Kind = MFloat8;
+      ElementBitwidth = 8;
+      break;
     default:
       llvm_unreachable("Unhandled type code!");
     }
@@ -993,6 +1003,9 @@ std::string Intrinsic::getInstTypeCode(Type T, ClassKind CK) const {
   if (T.isBFloat16())
     return "bf16";
 
+  if (T.isMFloat8())
+    return "mfp8";
+
   if (T.isPoly())
     typeCode = 'p';
   else if (T.isInteger())
@@ -1030,7 +1043,7 @@ std::string Intrinsic::getBuiltinTypeStr() {
 
   Type RetT = getReturnType();
   if ((LocalCK == ClassI || LocalCK == ClassW) && RetT.isScalar() &&
-      !RetT.isFloating() && !RetT.isBFloat16())
+      !RetT.isFloating() && !RetT.isBFloat16() && !RetT.isMFloat8())
     RetT.makeInteger(RetT.getElementSizeInBits(), false);
 
   // Since the return value must be one type, return a vector type of the
@@ -2270,7 +2283,7 @@ static void emitNeonTypeDefs(const std::string& types, raw_ostream &OS) {
   for (auto &TS : TDTypeVec) {
     bool IsA64 = false;
     Type T(TS, ".");
-    if (T.isDouble())
+    if (T.isDouble() || T.isMFloat8())
       IsA64 = true;
 
     if (InIfdef && !IsA64) {
@@ -2282,15 +2295,20 @@ static void emitNeonTypeDefs(const std::string& types, raw_ostream &OS) {
       InIfdef = true;
     }
 
-    if (T.isPoly())
+    if (T.isMFloat8())
+      OS << "typedef __MFloat8x";
+    else if (T.isPoly())
       OS << "typedef __attribute__((neon_polyvector_type(";
     else
       OS << "typedef __attribute__((neon_vector_type(";
 
     Type T2 = T;
     T2.makeScalar();
-    OS << T.getNumElements() << "))) ";
-    OS << T2.str();
+    OS << T.getNumElements();
+    if (T.isMFloat8())
+      OS << "_t ";
+    else
+      OS << "))) " << T2.str();
     OS << " " << T.str() << ";\n";
   }
   if (InIfdef)
@@ -2303,7 +2321,7 @@ static void emitNeonTypeDefs(const std::string& types, raw_ostream &OS) {
     for (auto &TS : TDTypeVec) {
       bool IsA64 = false;
       Type T(TS, ".");
-      if (T.isDouble())
+      if (T.isDouble() || T.isMFloat8())
         IsA64 = true;
 
       if (InIfdef && !IsA64) {
@@ -2589,8 +2607,6 @@ void NeonEmitter::runVectorTypes(raw_ostream &OS) {
 
   OS << "#if defined(__aarch64__) || defined(__arm64ec__)\n";
   OS << "typedef __mfp8 mfloat8_t;\n";
-  OS << "typedef __MFloat8x8_t mfloat8x8_t;\n";
-  OS << "typedef __MFloat8x16_t mfloat8x16_t;\n";
   OS << "typedef double float64_t;\n";
   OS << "#endif\n\n";
 
@@ -2648,7 +2664,7 @@ __arm_set_fpm_lscale2(fpm_t __fpm, uint64_t __scale) {
 
 )";
 
-  emitNeonTypeDefs("cQcsQsiQilQlUcQUcUsQUsUiQUiUlQUlhQhfQfdQd", OS);
+  emitNeonTypeDefs("cQcsQsiQilQlUcQUcUsQUsUiQUiUlQUlmQmhQhfQfdQd", OS);
 
   emitNeonTypeDefs("bQb", OS);
   OS << "#endif // __ARM_NEON_TYPES_H\n";