[RISCV] Add TuneVentanaVeyron subtarget feature.

This will be used to add veyron fusions in a later commit.

Author: mgudim

llvm/lib/Target/RISCV/RISCVFeatures.td

@@ -954,6 +954,10 @@ def TuneSiFive7 : SubtargetFeature<"sifive7", "RISCVProcFamily", "SiFive7",
                                    [TuneNoDefaultUnroll,
                                     TuneShortForwardBranchOpt]>;
 
+def TuneVentanaVeyron : SubtargetFeature<"ventana-veyron", "RISCVProcFamily", "VentanaVeyron",
+                                         "Ventana-Veyron Series processors",
+                                         [TuneLUIADDIFusion]>;
+
 // Assume that lock-free native-width atomics are available, even if the target
 // and operating system combination would not usually provide them. The user
 // is responsible for providing any necessary __sync implementations. Code

llvm/lib/Target/RISCV/RISCVProcessors.td

@@ -242,4 +242,5 @@ def VENTANA_VEYRON_V1 : RISCVProcessorModel<"veyron-v1",
                                              FeatureStdExtZicbom,
                                              FeatureStdExtZicbop,
                                              FeatureStdExtZicboz,
-                                             FeatureVendorXVentanaCondOps]>;
+                                             FeatureVendorXVentanaCondOps],
+                                             [TuneVentanaVeyron]>;

llvm/lib/Target/RISCV/RISCVSubtarget.h

@@ -46,10 +46,7 @@ struct RISCVTuneInfo {
 
 class RISCVSubtarget : public RISCVGenSubtargetInfo {
 public:
-  enum RISCVProcFamilyEnum : uint8_t {
-    Others,
-    SiFive7,
-  };
+  enum RISCVProcFamilyEnum : uint8_t { Others, SiFive7, VentanaVeyron };
 
 private:
   virtual void anchor();