[mips][sched] Added class for WSBH

[dsanders]

Summary

No functional change since no InstrItinData is provided.

Depends on D12189

[vkalintiris]

LGTM.

lib/Target/Mips/MicroMipsInstrInfo.td

let DecoderNamespace = "MicroMips", Predicates = [InMicroMips] in {
 
   /// Sign Ext In Register Instructions.
   def SEB_MM : MMRel, SignExtInReg<"seb", i8, GPR32Opnd, II_SEB>,
                SEB_FM_MM<0x0ac>, ISA_MIPS32R2;
   def SEH_MM : MMRel, SignExtInReg<"seh", i16, GPR32Opnd, II_SEH>,
                SEB_FM_MM<0x0ec>, ISA_MIPS32R2;
 
   /// Word Swap Bytes Within Halfwords
-  def WSBH_MM : MMRel, SubwordSwap<"wsbh", GPR32Opnd>, SEB_FM_MM<0x1ec>,
-                ISA_MIPS32R2;
+  def WSBH_MM : MMRel, SubwordSwap<"wsbh", GPR32Opnd, II_WSBH>,
+                SEB_FM_MM<0x1ec>, ISA_MIPS32R2;
 
   def EXT_MM : MMRel, ExtBase<"ext", GPR32Opnd, uimm5, MipsExt>,
                EXT_FM_MM<0x2c>;
   def INS_MM : MMRel, InsBase<"ins", GPR32Opnd, uimm5, MipsIns>,
                EXT_FM_MM<0x0c>;
 
   /// Jump Instructions
   let DecoderMethod = "DecodeJumpTargetMM" in {

lib/Target/Mips/MipsInstrInfo.td

 
 // Sign Extend in Register.
 class SignExtInReg<string opstr, ValueType vt, RegisterOperand RO,
                    InstrItinClass itin> :
   InstSE<(outs RO:$rd), (ins RO:$rt), !strconcat(opstr, "\t$rd, $rt"),
          [(set RO:$rd, (sext_inreg RO:$rt, vt))], itin, FrmR, opstr>;
 
 // Subword Swap
-class SubwordSwap<string opstr, RegisterOperand RO>:
-  InstSE<(outs RO:$rd), (ins RO:$rt), !strconcat(opstr, "\t$rd, $rt"), [],
-         NoItinerary, FrmR, opstr> {
+class SubwordSwap<string opstr, RegisterOperand RO,
+                  InstrItinClass itin = NoItinerary>:
+  InstSE<(outs RO:$rd), (ins RO:$rt), !strconcat(opstr, "\t$rd, $rt"), [], itin,
+         FrmR, opstr> {
   let hasSideEffects = 0;
 }
 
 // Read Hardware
 class ReadHardware<RegisterOperand CPURegOperand, RegisterOperand RO> :
   InstSE<(outs CPURegOperand:$rt), (ins RO:$rd), "rdhwr\t$rt, $rd", [],
          II_RDHWR, FrmR, "rdhwr">;
 

 
 /// Count Leading
 def CLZ : MMRel, CountLeading0<"clz", GPR32Opnd>, CLO_FM<0x20>,
           ISA_MIPS32_NOT_32R6_64R6;
 def CLO : MMRel, CountLeading1<"clo", GPR32Opnd>, CLO_FM<0x21>,
           ISA_MIPS32_NOT_32R6_64R6;
 
 /// Word Swap Bytes Within Halfwords
-def WSBH : MMRel, SubwordSwap<"wsbh", GPR32Opnd>, SEB_FM<2, 0x20>, ISA_MIPS32R2;
+def WSBH : MMRel, SubwordSwap<"wsbh", GPR32Opnd, II_WSBH>, SEB_FM<2, 0x20>,
+           ISA_MIPS32R2;
 
 /// No operation.
 def NOP : PseudoSE<(outs), (ins), []>, PseudoInstExpansion<(SLL ZERO, ZERO, 0)>;
 
 // FrameIndexes are legalized when they are operands from load/store
 // instructions. The same not happens for stack address copies, so an
 // add op with mem ComplexPattern is used and the stack address copy
 // can be matched. It's similar to Sparc LEA_ADDRi

lib/Target/Mips/MipsSchedule.td

 def II_SUB_S            : InstrItinClass;
 def II_SUXC1            : InstrItinClass;
 def II_SW               : InstrItinClass;
 def II_SWC1             : InstrItinClass;
 def II_SWL              : InstrItinClass;
 def II_SWR              : InstrItinClass;
 def II_SWXC1            : InstrItinClass;
 def II_TRUNC            : InstrItinClass;
+def II_WSBH             : InstrItinClass;
 def II_XOR              : InstrItinClass;
 def II_XORI             : InstrItinClass;
 
 //===----------------------------------------------------------------------===//
 // Mips Generic instruction itineraries.
 //===----------------------------------------------------------------------===//
 def MipsGenericItineraries : ProcessorItineraries<[ALU, IMULDIV], [], [
   InstrItinData<IIM16Alu           , [InstrStage<1,  [ALU]>]>,