[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{20-16} = rs;
   let Inst{15-0}  = offset;
 }
+
+class COP0_TLB_FM_MM<bits<10> op> : MMArch {
+  bits<32> Inst;
+
+  let Inst{31-26} = 0x0;
+  let Inst{25-16} = 0x0;
+  let Inst{15-6}  = op;
+  let Inst{5-0}   = 0x3c;
+}

lib/Target/Mips/MicroMipsInstrInfo.td

   /// Load-linked, Store-conditional
   def LL_MM : LLBaseMM<"ll", GPR32Opnd>, LL_FM_MM<0x3>;
   def SC_MM : SCBaseMM<"sc", GPR32Opnd>, LL_FM_MM<0xb>;
+
+  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:    ei  $10                    # encoding: [0x0a,0x00,0x7c,0x57]
 # CHECK-EL:    wait                       # encoding: [0x00,0x00,0x7c,0x93]
 # CHECK-EL:    wait 17                    # encoding: [0x11,0x00,0x7c,0x93]
+# CHECK-EL:    tlbp                       # encoding: [0x00,0x00,0x7c,0x03]
+# CHECK-EL:    tlbr                       # encoding: [0x00,0x00,0x7c,0x13]
+# CHECK-EL:    tlbwi                      # encoding: [0x00,0x00,0x7c,0x23]
+# CHECK-EL:    tlbwr                      # encoding: [0x00,0x00,0x7c,0x33]
 #------------------------------------------------------------------------------
 # Big endian
 #------------------------------------------------------------------------------

 # CHECK-EB:   ei  $10                     # encoding: [0x00,0x0a,0x57,0x7c]
 # CHECK-EB:   wait                        # encoding: [0x00,0x00,0x93,0x7c]
 # CHECK-EB:   wait 17                     # encoding: [0x00,0x11,0x93,0x7c]
+# CHECK-EB:   tlbp                        # encoding: [0x00,0x00,0x03,0x7c]
+# CHECK-EB:   tlbr                        # encoding: [0x00,0x00,0x13,0x7c]
+# CHECK-EB:   tlbwi                       # encoding: [0x00,0x00,0x23,0x7c]
+# CHECK-EB:   tlbwr                       # encoding: [0x00,0x00,0x33,0x7c]
 
     break
     break 7

     ei $10
     wait
     wait 17
+    tlbp
+    tlbr
+    tlbwi
+    tlbwr