[mips][mips64r6] Add Compact indexed jumps.

Differential Revision: http://reviews.llvm.org/D3707


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208981 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.cpp

@@ -282,6 +282,25 @@ getBranchTarget26OpValue(const MCInst &MI, unsigned OpNo,
   return 0;
 }
 
+/// getJumpOffset16OpValue - Return binary encoding of the jump
+/// target operand. If the machine operand requires relocation,
+/// record the relocation and return zero.
+unsigned MipsMCCodeEmitter::
+getJumpOffset16OpValue(const MCInst &MI, unsigned OpNo,
+                       SmallVectorImpl<MCFixup> &Fixups,
+                       const MCSubtargetInfo &STI) const {
+
+  const MCOperand &MO = MI.getOperand(OpNo);
+
+  if (MO.isImm()) return MO.getImm();
+
+  assert(MO.isExpr() &&
+         "getJumpOffset16OpValue expects only expressions or an immediate");
+
+   // TODO: Push fixup.
+   return 0;
+}
+
 /// getJumpTargetOpValue - Return binary encoding of the jump
 /// target operand. If the machine operand requires relocation,
 /// record the relocation and return zero.

lib/Target/Mips/MCTargetDesc/MipsMCCodeEmitter.h

@@ -102,6 +102,13 @@ public:
                                     SmallVectorImpl<MCFixup> &Fixups,
                                     const MCSubtargetInfo &STI) const;
 
+  // getJumpOffset16OpValue - Return binary encoding of the jump
+  // offset operand. If the machine operand requires relocation,
+  // record the relocation and return zero.
+  unsigned getJumpOffset16OpValue(const MCInst &MI, unsigned OpNo,
+                                  SmallVectorImpl<MCFixup> &Fixups,
+                                  const MCSubtargetInfo &STI) const;
+
   // getMachineOpValue - Return binary encoding of operand. If the machin
   // operand requires relocation, record the relocation and return zero.
   unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO,

lib/Target/Mips/Mips32r6InstrFormats.td

@@ -219,6 +219,18 @@ class CMP_BRANCH_OFF21_FM<bits<6> funct> : MipsR6Inst {
   let Inst{20-0} = offset;
 }
 
+class JMP_IDX_COMPACT_FM<bits<6> funct> : MipsR6Inst {
+  bits<5> rt;
+  bits<16> offset;
+
+  bits<32> Inst;
+
+  let Inst{31-26} = funct;
+  let Inst{25-21} = 0b000000;
+  let Inst{20-16} = rt;
+  let Inst{15-0} = offset;
+}
+
 class BRANCH_OFF26_FM<bits<6> funct> : MipsR6Inst {
   bits<32> Inst;
   bits<26> offset;

lib/Target/Mips/Mips32r6InstrInfo.td

@@ -66,6 +66,16 @@ def brtarget26 : Operand<OtherVT> {
   let ParserMatchClass = MipsJumpTargetAsmOperand;
 }
 
+def jmpoffset16 : Operand<OtherVT> {
+  let EncoderMethod = "getJumpOffset16OpValue";
+  let ParserMatchClass = MipsJumpTargetAsmOperand;
+}
+
+def calloffset16 : Operand<iPTR> {
+  let EncoderMethod = "getJumpOffset16OpValue";
+  let ParserMatchClass = MipsJumpTargetAsmOperand;
+}
+
 //===----------------------------------------------------------------------===//
 //
 // Instruction Encodings
@@ -97,6 +107,9 @@ class BEQZC_ENC : CMP_BRANCH_OFF21_FM<0b110110>;
 class BGEZALC_ENC : CMP_BRANCH_OFF16_FM<0b000110>;
 class BNEZC_ENC : CMP_BRANCH_OFF21_FM<0b111110>;
 
+class JIALC_ENC : JMP_IDX_COMPACT_FM<0b111110>;
+class JIC_ENC   : JMP_IDX_COMPACT_FM<0b110110>;
+
 class BITSWAP_ENC : SPECIAL3_2R_FM<OPCODE6_BITSWAP>;
 class BLEZALC_ENC : CMP_BRANCH_RT_OFF16_FM<0b000110>;
 class DIV_ENC    : SPECIAL_3R_FM<0b00010, 0b011010>;
@@ -310,6 +323,27 @@ class BGTZC_DESC : CMP_CBR_RT_Z_DESC_BASE<"bgtzc", brtarget, GPR32Opnd>;
 class BEQZC_DESC : CMP_CBR_EQNE_Z_DESC_BASE<"beqzc", brtarget21, GPR32Opnd>;
 class BNEZC_DESC : CMP_CBR_EQNE_Z_DESC_BASE<"bnezc", brtarget21, GPR32Opnd>;
 
+class JMP_IDX_COMPACT_DESC_BASE<string opstr, DAGOperand opnd,
+                                RegisterOperand GPROpnd> {
+  dag InOperandList = (ins GPROpnd:$rt, opnd:$offset);
+  string AsmString = !strconcat(opstr, "\t$rt, $offset");
+  list<dag> Pattern = [];
+  bit isTerminator = 1;
+  bit hasDelaySlot = 0;
+  string DecoderMethod = "DecodeSimm16";
+}
+
+class JIALC_DESC : JMP_IDX_COMPACT_DESC_BASE<"jialc", calloffset16,
+                                             GPR32Opnd> {
+  bit isCall = 1;
+  list<Register> Defs = [RA];
+}
+
+class JIC_DESC : JMP_IDX_COMPACT_DESC_BASE<"jic", jmpoffset16, GPR32Opnd> {
+  bit isBarrier = 1;
+  list<Register> Defs = [AT];
+}
+
 class BITSWAP_DESC_BASE<string instr_asm, RegisterOperand GPROpnd> {
   dag OutOperandList = (outs GPROpnd:$rd);
   dag InOperandList = (ins GPROpnd:$rt);
@@ -469,8 +503,8 @@ defm S : CMP_CC_M<FIELD_CMP_FORMAT_S, "s", FGR32Opnd>;
 defm D : CMP_CC_M<FIELD_CMP_FORMAT_D, "d", FGR64Opnd>;
 def DIV : DIV_ENC, DIV_DESC, ISA_MIPS32R6;
 def DIVU : DIVU_ENC, DIVU_DESC, ISA_MIPS32R6;
-def JIALC;
+def JIALC : JIALC_ENC, JIALC_DESC, ISA_MIPS32R6;
-def JIC;
+def JIC : JIC_ENC, JIC_DESC, ISA_MIPS32R6;
 // def LSA; // See MSA
 def LWPC : LWPC_ENC, LWPC_DESC, ISA_MIPS32R6;
 def LWUPC : LWUPC_ENC, LWUPC_DESC, ISA_MIPS32R6;

lib/Target/Mips/MipsCodeEmitter.cpp

@@ -114,6 +114,7 @@ private:
                                     unsigned OpNo) const;
   unsigned getBranchTarget26OpValue(const MachineInstr &MI,
                                     unsigned OpNo) const;
+  unsigned getJumpOffset16OpValue(const MachineInstr &MI, unsigned OpNo) const;
 
   unsigned getBranchTargetOpValue(const MachineInstr &MI, unsigned OpNo) const;
   unsigned getMemEncoding(const MachineInstr &MI, unsigned OpNo) const;
@@ -220,6 +221,12 @@ unsigned MipsCodeEmitter::getBranchTarget26OpValue(const MachineInstr &MI,
   return 0;
 }
 
+unsigned MipsCodeEmitter::getJumpOffset16OpValue(const MachineInstr &MI,
+                                                 unsigned OpNo) const {
+  llvm_unreachable("Unimplemented function.");
+  return 0;
+}
+
 unsigned MipsCodeEmitter::getBranchTargetOpValue(const MachineInstr &MI,
                                                  unsigned OpNo) const {
   MachineOperand MO = MI.getOperand(OpNo);

test/MC/Mips/mips32r6/valid.s

@@ -60,6 +60,8 @@
         cmp.ngt.d  $f2,$f3,$f4      # CHECK: cmp.ngt.d $f2, $f3, $f4  # encoding: [0x46,0xa4,0x18,0x8f]
         div     $2,$3,$4         # CHECK: div $2, $3, $4   # encoding: [0x00,0x64,0x10,0x9a]
         divu    $2,$3,$4         # CHECK: divu $2, $3, $4  # encoding: [0x00,0x64,0x10,0x9b]
+        jialc   $5, 256          # CHECK: jialc $5, 256    # encoding: [0xf8,0x05,0x01,0x00]
+        jic     $5, 256          # CHECK: jic $5, 256      # encoding: [0xd8,0x05,0x01,0x00]
         lwpc    $2,268           # CHECK: lwpc $2, 268     # encoding: [0xec,0x48,0x00,0x43]
         lwupc   $2,268           # CHECK: lwupc $2, 268    # encoding: [0xec,0x50,0x00,0x43]
         mod     $2,$3,$4         # CHECK: mod $2, $3, $4   # encoding: [0x00,0x64,0x10,0xda]

test/MC/Mips/mips64r6/valid.s

@@ -65,6 +65,8 @@
         dbitswap $4, $2           # CHECK: bitswap $4, $2      # encoding: [0x7c,0x02,0x20,0x24]
         div     $2,$3,$4         # CHECK: div $2, $3, $4   # encoding: [0x00,0x64,0x10,0x9a]
         divu    $2,$3,$4         # CHECK: divu $2, $3, $4  # encoding: [0x00,0x64,0x10,0x9b]
+        jialc   $5, 256          # CHECK: jialc $5, 256    # encoding: [0xf8,0x05,0x01,0x00]
+        jic     $5, 256          # CHECK: jic $5, 256      # encoding: [0xd8,0x05,0x01,0x00]
         mod     $2,$3,$4         # CHECK: mod $2, $3, $4   # encoding: [0x00,0x64,0x10,0xda]
         modu    $2,$3,$4         # CHECK: modu $2, $3, $4  # encoding: [0x00,0x64,0x10,0xdb]
         ddiv    $2,$3,$4         # CHECK: ddiv $2, $3, $4  # encoding: [0x00,0x64,0x10,0x9e]