[RISCV] Consider scalar types for required extensions.

[HsiangKai]

Summary

We have vector operations on double vector and float scalar. For
example, vfwadd.wf is such a instruction.

vfloat64m1_t vfwadd_wf(vfloat64m1_t op0, float op1, size_t op2);

We should specify F and D extensions for it.

[khchen]

Good catch! LGTM!

[craig.topper]

LGTM too

clang/utils/TableGen/RISCVVEmitter.cpp

public:
   bool isVector() const { return Scale.hasValue() && Scale.getValue() != 0; }
   bool isFloat() const { return ScalarType == ScalarTypeKind::Float; }
   bool isSignedInteger() const {
     return ScalarType == ScalarTypeKind::SignedInteger;
   }
   bool isFloatVector(unsigned Width) const {
     return isVector() && isFloat() && ElementBitwidth == Width;
   }
+  bool isFloat(unsigned Width) const {
+    return isFloat() && ElementBitwidth == Width;
+  }
 
 private:
   // Verify RVV vector type and set Valid.
   bool verifyType() const;
 
   // Creates a type based on basic types of TypeRange
   void applyBasicType();
 
else
     MangledName = NewMangledName.str();
   if (!Suffix.empty())
     Name += "_" + Suffix.str();
   if (IsMask) {
     Name += "_m";
   }
   // Init RISC-V extensions
   for (const auto &T : OutInTypes) {
-    if (T->isFloatVector(16))
+    if (T->isFloatVector(16) || T->isFloat(16))
       RISCVExtensions |= RISCVExtension::Zfh;
-    else if (T->isFloatVector(32))
+    else if (T->isFloatVector(32) || T->isFloat(32))
       RISCVExtensions |= RISCVExtension::F;
-    else if (T->isFloatVector(64))
+    else if (T->isFloatVector(64) || T->isFloat(64))
       RISCVExtensions |= RISCVExtension::D;
   }
   if (RequiredExtension == "Zvamo")
     RISCVExtensions |= RISCVExtension::Zvamo;
 
   // Init OutputType and InputTypes
   OutputType = OutInTypes[0];
   InputTypes.assign(OutInTypes.begin() + 1, OutInTypes.end());