[mips] Add itineraries for ext and ins instructions.

[Kai]

Summary

Currently, there are no itineraries defined for ext and ins instructions.
This patch adds these itineraries.

My question is if this is the right way because there are several styles used.
There are:

• General itineraries like IIAlu
• Itineraries for individual instructions: II_ADDI, II_ADDI, II_ADDU
• Itineraries for an instruction's family: II_C_CC_D

[dsanders]

LGTM.

My question is if this is the right way because there are several styles used.
There are:

• General itineraries like IIAlu
• Itineraries for individual instructions: II_ADDI, II_ADDI, II_ADDU
• Itineraries for an instruction's family: II_C_CC_D

We were phasing out the general itineraries since they didn't map very well to the P5600. I'd nearly finished this migration at the point I was interrupted by more pressing correctness issues and new instruction sets like MIPS32r6. I should be getting back to the P5600 scheduler soon. The individual II_*'s are preferred but there's a couple groups (like II_C_CC_D) where it was difficult and unnecessary to be more precise.

[Kai]

Thanks for the explanation. I work already on an Octeon scheduler.

[Kai]

Thanks for the explanation. I work already on an Octeon scheduler.

lib/Target/Mips/MipsInstrInfo.td

class ReadHardware<RegisterOperand CPURegOperand, RegisterOperand RO> :
   InstSE<(outs CPURegOperand:$rt), (ins RO:$rd), "rdhwr\t$rt, $rd", [],
          II_RDHWR, FrmR, "rdhwr">;
 
 // Ext and Ins
 class ExtBase<string opstr, RegisterOperand RO, Operand PosOpnd,
               SDPatternOperator Op = null_frag>:
   InstSE<(outs RO:$rt), (ins RO:$rs, PosOpnd:$pos, size_ext:$size),
          !strconcat(opstr, " $rt, $rs, $pos, $size"),
-         [(set RO:$rt, (Op RO:$rs, imm:$pos, imm:$size))], NoItinerary,
+         [(set RO:$rt, (Op RO:$rs, imm:$pos, imm:$size))], II_EXT,
          FrmR, opstr>, ISA_MIPS32R2;
 
 class InsBase<string opstr, RegisterOperand RO, Operand PosOpnd,
               SDPatternOperator Op = null_frag>:
   InstSE<(outs RO:$rt), (ins RO:$rs, PosOpnd:$pos, size_ins:$size, RO:$src),
          !strconcat(opstr, " $rt, $rs, $pos, $size"),
          [(set RO:$rt, (Op RO:$rs, imm:$pos, imm:$size, RO:$src))],
-         NoItinerary, FrmR, opstr>, ISA_MIPS32R2 {
+         II_INS, FrmR, opstr>, ISA_MIPS32R2 {
   let Constraints = "$src = $rt";
 }
 
 // Atomic instructions with 2 source operands (ATOMIC_SWAP & ATOMIC_LOAD_*).
 class Atomic2Ops<PatFrag Op, RegisterClass DRC> :
   PseudoSE<(outs DRC:$dst), (ins PtrRC:$ptr, DRC:$incr),
            [(set DRC:$dst, (Op iPTR:$ptr, DRC:$incr))]>;
 

lib/Target/Mips/MipsSchedule.td

 def II_DSRA             : InstrItinClass;
 def II_DSRA32           : InstrItinClass;
 def II_DSRAV            : InstrItinClass;
 def II_DSRL             : InstrItinClass;
 def II_DSRL32           : InstrItinClass;
 def II_DSRLV            : InstrItinClass;
 def II_DSUBU            : InstrItinClass;
 def II_DSUB             : InstrItinClass;
+def II_EXT              : InstrItinClass; // Any EXT instruction
 def II_FLOOR            : InstrItinClass;
+def II_INS              : InstrItinClass; // Any INS instruction
 def II_LB               : InstrItinClass;
 def II_LBU              : InstrItinClass;
 def II_LD               : InstrItinClass;
 def II_LDC1             : InstrItinClass;
 def II_LDL              : InstrItinClass;
 def II_LDR              : InstrItinClass;
 def II_LDXC1            : InstrItinClass;
 def II_LH               : InstrItinClass;
def MipsGenericItineraries : ProcessorItineraries<[ALU, IMULDIV], [], [
   InstrItinData<II_DSRA            , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_DSLLV           , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_DSRLV           , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_DSRAV           , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_DSUBU           , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_DSUB            , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_DROTR           , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_DROTRV          , [InstrStage<1,  [ALU]>]>,
+  InstrItinData<II_EXT             , [InstrStage<1,  [ALU]>]>,
+  InstrItinData<II_INS             , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_LUI             , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_MOVF            , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_MOVN            , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_MOVN_S          , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_MOVN_D          , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_MOVT            , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_MOVZ            , [InstrStage<1,  [ALU]>]>,
   InstrItinData<II_NOR             , [InstrStage<1,  [ALU]>]>,