[mips][microMIPS] Implement TLBP, TLBR, TLBWI and TLBWR instructions

[jkolek]

Summary

Implement microMIPS TLBP, TLBR, TLBWI and TLBWR.

[dsanders]

LGTM with an encoding correction

lib/Target/Mips/MicroMipsInstrFormats.td

802

This is zero in the microMIPS spec.

[jkolek]

Fixed instructions binary format.

Closed by commit rL217675 (authored by zjovanovic).

lib/Target/Mips/MicroMipsInstrFormats.td

   let Inst{10-6}  = 0x0;
   let Inst{5-0}   = 0x0;
 }
+
+class COP0_TLB_FM_MM<bits<10> op> : MMArch {
+  bits<32> Inst;
+
+  let Inst{31-26} = 0x0;
+  let Inst{25-16} = 1;
+  let Inst{15-6}  = op;
+  let Inst{5-0}   = 0x3c;
+}

lib/Target/Mips/MicroMipsInstrInfo.td

   def SSNOP_MM : MMRel, Barrier<"ssnop">, BARRIER_FM_MM<0x1>;
   def EHB_MM   : MMRel, Barrier<"ehb">, BARRIER_FM_MM<0x2>;
   def PAUSE_MM : MMRel, Barrier<"pause">, BARRIER_FM_MM<0x5>;
+
+  def TLBP_MM : MMRel, TLB<"tlbp">, COP0_TLB_FM_MM<0x0d>;
+  def TLBR_MM : MMRel, TLB<"tlbr">, COP0_TLB_FM_MM<0x4d>;
+  def TLBWI_MM : MMRel, TLB<"tlbwi">, COP0_TLB_FM_MM<0x8d>;
+  def TLBWR_MM : MMRel, TLB<"tlbwr">, COP0_TLB_FM_MM<0xcd>;
 }
 
 //===----------------------------------------------------------------------===//

lib/Target/Mips/MipsInstrInfo.td

 def JALR_HB : JALR_HB_DESC, JALR_HB_ENC, ISA_MIPS32;
 
 class TLB<string asmstr> : InstSE<(outs), (ins), asmstr, [], NoItinerary,
-                                      FrmOther>;
-def TLBP : TLB<"tlbp">, COP0_TLB_FM<0x08>;
-def TLBR : TLB<"tlbr">, COP0_TLB_FM<0x01>;
-def TLBWI : TLB<"tlbwi">, COP0_TLB_FM<0x02>;
-def TLBWR : TLB<"tlbwr">, COP0_TLB_FM<0x06>;
+                                      FrmOther, asmstr>;
+def TLBP : MMRel, TLB<"tlbp">, COP0_TLB_FM<0x08>;
+def TLBR : MMRel, TLB<"tlbr">, COP0_TLB_FM<0x01>;
+def TLBWI : MMRel, TLB<"tlbwi">, COP0_TLB_FM<0x02>;
+def TLBWR : MMRel, TLB<"tlbwr">, COP0_TLB_FM<0x06>;
 
 class CacheOp<string instr_asm, Operand MemOpnd, RegisterOperand GPROpnd> :
     InstSE<(outs), (ins  MemOpnd:$addr, uimm5:$hint),

test/MC/Mips/micromips-control-instructions.s

 # CHECK-EL:    ssnop                      # encoding: [0x00,0x00,0x40,0x00]
 # CHECK-EL:    ehb                        # encoding: [0x00,0x00,0xc0,0x00]
 # CHECK-EL:    pause                      # encoding: [0x00,0x00,0x40,0x01]
+# CHECK-EL:    tlbp                       # encoding: [0x01,0x00,0x7c,0x03]
+# CHECK-EL:    tlbr                       # encoding: [0x01,0x00,0x7c,0x13]
+# CHECK-EL:    tlbwi                      # encoding: [0x01,0x00,0x7c,0x23]
+# CHECK-EL:    tlbwr                      # encoding: [0x01,0x00,0x7c,0x33]
 # CHECK-EL:    break                      # encoding: [0x00,0x00,0x07,0x00]
 # CHECK-EL:    break 7                    # encoding: [0x07,0x00,0x07,0x00]
 # CHECK-EL:    break 7, 5                 # encoding: [0x07,0x00,0x47,0x01]

 # CHECK-EB:   ssnop                       # encoding: [0x00,0x00,0x00,0x40]
 # CHECK-EB:   ehb                         # encoding: [0x00,0x00,0x00,0xc0]
 # CHECK-EB:   pause                       # encoding: [0x00,0x00,0x01,0x40]
+# CHECK-EB:   tlbp                        # encoding: [0x00,0x01,0x03,0x7c]
+# CHECK-EB:   tlbr                        # encoding: [0x00,0x01,0x13,0x7c]
+# CHECK-EB:   tlbwi                       # encoding: [0x00,0x01,0x23,0x7c]
+# CHECK-EB:   tlbwr                       # encoding: [0x00,0x01,0x33,0x7c]
 # CHECK-EB:   break                       # encoding: [0x00,0x00,0x00,0x07]
 # CHECK-EB:   break 7                     # encoding: [0x00,0x07,0x00,0x07]
 # CHECK-EB:   break 7, 5                  # encoding: [0x00,0x07,0x01,0x47]

     ssnop
     ehb
     pause
+    tlbp
+    tlbr
+    tlbwi
+    tlbwr
     break
     break 7
     break 7,5