[RISCV][NFC] Use Arrayref in TargetLowering functions.

[kito-cheng]

LGTM

llvm/lib/Target/RISCV/RISCVISelLowering.cpp

static const ISD::CondCode FPCCToExpand[] = {
       ISD::SETOGT, ISD::SETOGE, ISD::SETONE, ISD::SETUEQ, ISD::SETUGT,
       ISD::SETUGE, ISD::SETULT, ISD::SETULE, ISD::SETUNE, ISD::SETGT,
       ISD::SETGE,  ISD::SETNE,  ISD::SETO,   ISD::SETUO};
 
   static const unsigned FPOpToExpand[] = {
       ISD::FSIN, ISD::FCOS,       ISD::FSINCOS,   ISD::FPOW,
       ISD::FREM, ISD::FP16_TO_FP, ISD::FP_TO_FP16};
 
+  static const unsigned FPRndMode[] = {
+      ISD::FCEIL, ISD::FFLOOR, ISD::FTRUNC, ISD::FRINT, ISD::FROUND,
+      ISD::FROUNDEVEN};
+
   if (Subtarget.hasStdExtZfhOrZfhmin())
     setOperationAction(ISD::BITCAST, MVT::i16, Custom);
 
   if (Subtarget.hasStdExtZfhOrZfhmin()) {
     if (Subtarget.hasStdExtZfh()) {
       setOperationAction(FPLegalNodeTypes, MVT::f16, Legal);
-      setOperationAction(ISD::FCEIL, MVT::f16, Custom);
-      setOperationAction(ISD::FFLOOR, MVT::f16, Custom);
-      setOperationAction(ISD::FTRUNC, MVT::f16, Custom);
-      setOperationAction(ISD::FRINT, MVT::f16, Custom);
-      setOperationAction(ISD::FROUND, MVT::f16, Custom);
-      setOperationAction(ISD::FROUNDEVEN, MVT::f16, Custom);
+      setOperationAction(FPRndMode, MVT::f16, Custom);
       setOperationAction(ISD::SELECT, MVT::f16, Custom);
     } else {
       static const unsigned ZfhminPromoteOps[] = {
           ISD::FMINNUM,      ISD::FMAXNUM,       ISD::FADD,
           ISD::FSUB,         ISD::FMUL,          ISD::FMA,
           ISD::FDIV,         ISD::FSQRT,         ISD::FABS,
           ISD::FNEG,         ISD::STRICT_FMA,    ISD::STRICT_FADD,
           ISD::STRICT_FSUB,  ISD::STRICT_FMUL,   ISD::STRICT_FDIV,
if (Subtarget.hasStdExtZfhOrZfhmin()) {
 
     // We need to custom promote this.
     if (Subtarget.is64Bit())
       setOperationAction(ISD::FPOWI, MVT::i32, Custom);
   }
 
   if (Subtarget.hasStdExtF()) {
     setOperationAction(FPLegalNodeTypes, MVT::f32, Legal);
-    setOperationAction(ISD::FCEIL, MVT::f32, Custom);
-    setOperationAction(ISD::FFLOOR, MVT::f32, Custom);
-    setOperationAction(ISD::FTRUNC, MVT::f32, Custom);
-    setOperationAction(ISD::FRINT, MVT::f32, Custom);
-    setOperationAction(ISD::FROUND, MVT::f32, Custom);
-    setOperationAction(ISD::FROUNDEVEN, MVT::f32, Custom);
+    setOperationAction(FPRndMode, MVT::f32, Custom);
     setCondCodeAction(FPCCToExpand, MVT::f32, Expand);
     setOperationAction(ISD::SELECT_CC, MVT::f32, Expand);
     setOperationAction(ISD::SELECT, MVT::f32, Custom);
     setOperationAction(ISD::BR_CC, MVT::f32, Expand);
     setOperationAction(FPOpToExpand, MVT::f32, Expand);
     setLoadExtAction(ISD::EXTLOAD, MVT::f32, MVT::f16, Expand);
     setTruncStoreAction(MVT::f32, MVT::f16, Expand);
   }
 
   if (Subtarget.hasStdExtF() && Subtarget.is64Bit())
     setOperationAction(ISD::BITCAST, MVT::i32, Custom);
 
   if (Subtarget.hasStdExtD()) {
     setOperationAction(FPLegalNodeTypes, MVT::f64, Legal);
     if (Subtarget.is64Bit()) {
-      setOperationAction(ISD::FCEIL, MVT::f64, Custom);
-      setOperationAction(ISD::FFLOOR, MVT::f64, Custom);
-      setOperationAction(ISD::FTRUNC, MVT::f64, Custom);
-      setOperationAction(ISD::FRINT, MVT::f64, Custom);
-      setOperationAction(ISD::FROUND, MVT::f64, Custom);
-      setOperationAction(ISD::FROUNDEVEN, MVT::f64, Custom);
+      setOperationAction(FPRndMode, MVT::f64, Custom);
     }
     setOperationAction(ISD::STRICT_FP_ROUND, MVT::f32, Legal);
     setOperationAction(ISD::STRICT_FP_EXTEND, MVT::f64, Legal);
     setCondCodeAction(FPCCToExpand, MVT::f64, Expand);
     setOperationAction(ISD::SELECT_CC, MVT::f64, Expand);
     setOperationAction(ISD::SELECT, MVT::f64, Custom);
     setOperationAction(ISD::BR_CC, MVT::f64, Expand);
     setLoadExtAction(ISD::EXTLOAD, MVT::f64, MVT::f32, Expand);