[clang][AArch64] Add SME2.1 feature macros

This patch adds the following macros to clang which are described in the
alpha SME2.1 specification within the ACLE
(https://github.com/ARM-software/acle/pull/309/files)

- __ARM_FEATURE_SMEB16B16 (enabled by '+sme-b16b16')
- __ARM_FEATURE_SVEB16B16 (enabled by '+sve-b16b16' or '+sme-b16b16')
- __ARM_FEATURE_SMEF16F16 (enabled by '+sme-f16f16')

Redundant use of the clang macro-builder has also been removed, pre-processor
tests have been added for each new macro.

Author: SpencerAbson

clang/lib/Basic/Targets/AArch64.cpp

@@ -471,23 +471,25 @@ void AArch64TargetInfo::getTargetDefines(const LangOptions &Opts,
   if (HasSVE2 && HasSVE2SM4)
     Builder.defineMacro("__ARM_FEATURE_SVE2_SM4", "1");
 
+  if (HasSVEB16B16)
+    Builder.defineMacro("__ARM_FEATURE_SVE_B16B16", "1");
+
   if (HasSME) {
     Builder.defineMacro("__ARM_FEATURE_SME");
     Builder.defineMacro("__ARM_FEATURE_LOCALLY_STREAMING", "1");
   }
 
-  if (HasSME2) {
-    Builder.defineMacro("__ARM_FEATURE_SME", "1");
+  if (HasSME2)
     Builder.defineMacro("__ARM_FEATURE_SME2", "1");
-    Builder.defineMacro("__ARM_FEATURE_LOCALLY_STREAMING", "1");
-  }
 
-  if (HasSME2p1) {
-    Builder.defineMacro("__ARM_FEATURE_SME", "1");
-    Builder.defineMacro("__ARM_FEATURE_SME2", "1");
+  if (HasSME2p1)
     Builder.defineMacro("__ARM_FEATURE_SME2p1", "1");
-    Builder.defineMacro("__ARM_FEATURE_LOCALLY_STREAMING", "1");
-  }
+
+  if (HasSMEF16F16)
+    Builder.defineMacro("__ARM_FEATURE_SME_F16F16", "1");
+
+  if (HasSMEB16B16)
+    Builder.defineMacro("__ARM_FEATURE_SME_B16B16", "1");
 
   if (HasCRC)
     Builder.defineMacro("__ARM_FEATURE_CRC32", "1");
@@ -749,6 +751,7 @@ bool AArch64TargetInfo::hasFeature(StringRef Feature) const {
       .Case("sve", FPU & SveMode)
       .Case("sve-bf16", FPU & SveMode && HasBFloat16)
       .Case("sve-i8mm", FPU & SveMode && HasMatMul)
+      .Case("sve-b16b16", HasSVEB16B16)
       .Case("f32mm", FPU & SveMode && HasMatmulFP32)
       .Case("f64mm", FPU & SveMode && HasMatmulFP64)
       .Case("sve2", FPU & SveMode && HasSVE2)
@@ -763,6 +766,8 @@ bool AArch64TargetInfo::hasFeature(StringRef Feature) const {
       .Case("sme-f64f64", HasSMEF64F64)
       .Case("sme-i16i64", HasSMEI16I64)
       .Case("sme-fa64", HasSMEFA64)
+      .Case("sme-f16f16", HasSMEF16F16)
+      .Case("sme-b16b16", HasSMEB16B16)
       .Cases("memtag", "memtag2", HasMTE)
       .Case("sb", HasSB)
       .Case("predres", HasPredRes)
@@ -863,6 +868,8 @@ bool AArch64TargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
       HasSVE2 = true;
       HasSVE2SM4 = true;
     }
+    if (Feature == "+sve-b16b16")
+      HasSVEB16B16 = true;
     if (Feature == "+sve2-bitperm") {
       FPU |= NeonMode;
       FPU |= SveMode;
@@ -919,6 +926,21 @@ bool AArch64TargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
       HasSVE2 = true;
       HasSMEFA64 = true;
     }
+    if (Feature == "+sme-f16f16") {
+      HasSME = true;
+      HasSME2 = true;
+      HasBFloat16 = true;
+      HasFullFP16 = true;
+      HasSMEF16F16 = true;
+    }
+    if (Feature == "+sme-b16b16") {
+      HasSME = true;
+      HasSME2 = true;
+      HasBFloat16 = true;
+      HasFullFP16 = true;
+      HasSVEB16B16 = true;
+      HasSMEB16B16 = true;
+    }
     if (Feature == "+sb")
       HasSB = true;
     if (Feature == "+predres")

clang/lib/Basic/Targets/AArch64.h

@@ -53,6 +53,7 @@ class LLVM_LIBRARY_VISIBILITY AArch64TargetInfo : public TargetInfo {
   bool HasSVE2AES = false;
   bool HasSVE2SHA3 = false;
   bool HasSVE2SM4 = false;
+  bool HasSVEB16B16 = false;
   bool HasSVE2BitPerm = false;
   bool HasMatmulFP64 = false;
   bool HasMatmulFP32 = false;
@@ -71,6 +72,8 @@ class LLVM_LIBRARY_VISIBILITY AArch64TargetInfo : public TargetInfo {
   bool HasSME2 = false;
   bool HasSMEF64F64 = false;
   bool HasSMEI16I64 = false;
+  bool HasSMEF16F16 = false;
+  bool HasSMEB16B16 = false;
   bool HasSME2p1 = false;
   bool HasSB = false;
   bool HasPredRes = false;

clang/test/Preprocessor/aarch64-target-features.c

@@ -709,3 +709,19 @@
 // CHECK-SME2p1: __ARM_FEATURE_SME 1
 // CHECK-SME2p1: __ARM_FEATURE_SME2 1
 // CHECK-SME2p1: __ARM_FEATURE_SME2p1 1
+
+// RUN: %clang --target=aarch64 -march=armv9-a+sve-b16b16 -x c -E -dM %s -o - | FileCheck --check-prefix=CHECK-SVEB16B16 %s
+// CHECK-SVEB16B16: __ARM_FEATURE_SVE_B16B16 1
+
+// RUN: %clang --target=aarch64 -march=armv9-a+sme-f16f16 -x c -E -dM %s -o - | FileCheck --check-prefix=CHECK-SMEF16F16 %s
+// CHECK-SMEF16F16: __ARM_FEATURE_LOCALLY_STREAMING 1
+// CHECK-SMEF16F16: __ARM_FEATURE_SME 1
+// CHECK-SMEF16F16: __ARM_FEATURE_SME2 1
+// CHECK-SMEF16F16: __ARM_FEATURE_SME_F16F16 1
+
+// RUN: %clang --target=aarch64 -march=armv9-a+sme-b16b16 -x c -E -dM %s -o - | FileCheck --check-prefix=CHECK-SMEB16B16 %s
+// CHECK-SMEB16B16: __ARM_FEATURE_LOCALLY_STREAMING 1
+// CHECK-SMEB16B16: __ARM_FEATURE_SME 1
+// CHECK-SMEB16B16: __ARM_FEATURE_SME2 1
+// CHECK-SMEB16B16: __ARM_FEATURE_SME_B16B16 1
+// CHECK-SMEB16B16: __ARM_FEATURE_SVE_B16B16 1