[PowerPC] Add support for encoding slbfee (SLB Find Entry ESID) instruction.

[echristo]

LGTM.

Feels awkward to have isDot represented this way, but that's very much not an issue with this patch :)

-eric

lib/Target/PowerPC/P9InstrResources.td

def : InstRW<[],
   (instregex "TLB(IA|IVAX|SX|SX2|SX2D|LD|LI|RE|RE2|WE|WE2)$"),
   (instregex "WRTEE(I)?$"),
   ATTN,
   CLRBHRB,
   MFBHRBE,
   MBAR,
   MSYNC,
   SLBSYNC,
+  SLBFEEo,
   NAP,
   STOP,
   TRAP,
   RFCI,
   RFDI,
   RFMCI,
   SC,
   DCBA,
   DCBI,
   DCCCI,
   ICCCI
 )> { let Unsupported = 1; }

lib/Target/PowerPC/PPCInstrFormats.td

class XForm_25<bits<6> opcode, bits<10> xo, dag OOL, dag IOL, string asmstr,
   : XForm_base_r3xo<opcode, xo, OOL, IOL, asmstr, itin, pattern> {
 }
 
 class XForm_25_memOp<bits<6> opcode, bits<10> xo, dag OOL, dag IOL,
                     string asmstr, InstrItinClass itin, list<dag> pattern>
   : XForm_base_r3xo_memOp<opcode, xo, OOL, IOL, asmstr, itin, pattern> {
 }
 
+// [PO RT /// RB XO RC]
 class XForm_26<bits<6> opcode, bits<10> xo, dag OOL, dag IOL, string asmstr,
                InstrItinClass itin, list<dag> pattern>
   : XForm_base_r3xo<opcode, xo, OOL, IOL, asmstr, itin, pattern> {
   let A = 0;
 }
 
 class XForm_28_memOp<bits<6> opcode, bits<10> xo, dag OOL, dag IOL,
                     string asmstr, InstrItinClass itin, list<dag> pattern>

lib/Target/PowerPC/PPCInstrInfo.td

 def SLBMFEE : XForm_26<31, 915, (outs gprc:$RT), (ins gprc:$RB),
                        "slbmfee $RT, $RB", IIC_SprSLBMFEE, []>;
 
 def SLBMFEV : XLForm_1_gen<31, 851, (outs gprc:$RT), (ins gprc:$RB),
                        "slbmfev $RT, $RB", IIC_SprSLBMFEV, []>;
 
 def SLBIA : XForm_0<31, 498, (outs), (ins), "slbia", IIC_SprSLBIA, []>;
 
+let Defs = [CR0] in
+def SLBFEEo : XForm_26<31, 979, (outs gprc:$RT), (ins gprc:$RB),
+                         "slbfee. $RT, $RB", IIC_SprSLBFEE, []>, isDOT;
+
 def TLBIA : XForm_0<31, 370, (outs), (ins),
                         "tlbia", IIC_SprTLBIA, []>;
 
 def TLBSYNC : XForm_0<31, 566, (outs), (ins),
                         "tlbsync", IIC_SprTLBSYNC, []>;
 
 def TLBIEL : XForm_16b<31, 274, (outs), (ins gprc:$RB),
                           "tlbiel $RB", IIC_SprTLBIEL, []>;

lib/Target/PowerPC/PPCSchedule.td

 def IIC_VecFPCompare : InstrItinClass;
 def IIC_VecComplex   : InstrItinClass;
 def IIC_VecPerm      : InstrItinClass;
 def IIC_VecFPRound   : InstrItinClass;
 def IIC_VecVSL       : InstrItinClass;
 def IIC_VecVSR       : InstrItinClass;
 def IIC_SprMTMSRD    : InstrItinClass;
 def IIC_SprSLIE      : InstrItinClass;
+def IIC_SprSLBFEE    : InstrItinClass;
 def IIC_SprSLBIE     : InstrItinClass;
 def IIC_SprSLBIEG    : InstrItinClass;
 def IIC_SprSLBMTE    : InstrItinClass;
 def IIC_SprSLBMFEE   : InstrItinClass;
 def IIC_SprSLBMFEV   : InstrItinClass;
 def IIC_SprSLBIA     : InstrItinClass;
 def IIC_SprSLBSYNC   : InstrItinClass;
 def IIC_SprTLBIA     : InstrItinClass;

test/MC/PowerPC/ppc64-encoding-bookIII.s

 # CHECK-BE: slbmfev 2, 3                    # encoding: [0x7c,0x40,0x1e,0xa6]
 # CHECK-LE: slbmfev 2, 3                    # encoding: [0xa6,0x1e,0x40,0x7c]
             slbmfev %r2, %r3
 
 # CHECK-BE: slbia                           # encoding: [0x7c,0x00,0x03,0xe4]
 # CHECK-LE: slbia                           # encoding: [0xe4,0x03,0x00,0x7c]
             slbia
 
+# CHECK-BE: slbfee. 4, 5                    # encoding: [0x7c,0x80,0x2f,0xa7]
+# CHECK-LE: slbfee. 4, 5                    # encoding: [0xa7,0x2f,0x80,0x7c]
+            slbfee. %r4, %r5
+
 # CHECK-BE: tlbsync                         # encoding: [0x7c,0x00,0x04,0x6c]
 # CHECK-LE: tlbsync                         # encoding: [0x6c,0x04,0x00,0x7c]
             tlbsync
 
 # CHECK-BE: tlbiel 4                        # encoding: [0x7c,0x00,0x22,0x24]
 # CHECK-LE: tlbiel 4                        # encoding: [0x24,0x22,0x00,0x7c]
             tlbiel %r4