[AArch64] Make the use of FP instructions optional, but enabled by default.

This adds a new subtarget feature called FPARMv8 (implied by NEON), and
predicates the support of the FP instructions and registers on this feature.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193739 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 1 deletions

diff --git a/lib/Target/AArch64/AArch64Subtarget.h b/lib/Target/AArch64/AArch64Subtarget.h
index f262b94617..57eb187c9d 100644
--- a/lib/Target/AArch64/AArch64Subtarget.h
+++ b/lib/Target/AArch64/AArch64Subtarget.h
@@ -28,11 +28,19 @@ class GlobalValue;
 
 class AArch64Subtarget : public AArch64GenSubtargetInfo {
 protected:
+  bool HasFPARMv8;
   bool HasNEON;
   bool HasCrypto;
 
   /// TargetTriple - What processor and OS we're targeting.
   Triple TargetTriple;
+
+  /// CPUString - String name of used CPU.
+  std::string CPUString;
+
+private:
+  void initializeSubtargetFeatures(StringRef CPU, StringRef FS);
+
 public:
   /// This constructor initializes the data members to match that
   /// of the specified triple.
@@ -52,9 +60,11 @@ public:
   bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
   bool isTargetLinux() const { return TargetTriple.isOSLinux(); }
 
+  bool hasFPARMv8() const { return HasFPARMv8; }
   bool hasNEON() const { return HasNEON; }
-
   bool hasCrypto() const { return HasCrypto; }
+
+  const std::string & getCPUString() const { return CPUString; }
 };
 } // End llvm namespace