[mips] Fix FP branch instructions to have explicit FP condition code register

operands.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187238 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 41 insertions, 25 deletions

diff --git a/lib/Target/Mips/Disassembler/MipsDisassembler.cpp b/lib/Target/Mips/Disassembler/MipsDisassembler.cpp
index 8899aeb..bf640a7 100644
--- a/lib/Target/Mips/Disassembler/MipsDisassembler.cpp
+++ b/lib/Target/Mips/Disassembler/MipsDisassembler.cpp
@@ -123,6 +123,11 @@ static DecodeStatus DecodeCCRRegisterClass(MCInst &Inst,
                                            uint64_t Address,
                                            const void *Decoder);
 
+static DecodeStatus DecodeFCCRegisterClass(MCInst &Inst,
+                                           unsigned RegNo,
+                                           uint64_t Address,
+                                           const void *Decoder);
+
 static DecodeStatus DecodeHWRegsRegisterClass(MCInst &Inst,
                                               unsigned Insn,
                                               uint64_t Address,
@@ -158,12 +163,6 @@ static DecodeStatus DecodeBranchTarget(MCInst &Inst,
                                        uint64_t Address,
                                        const void *Decoder);
 
-static DecodeStatus DecodeBC1(MCInst &Inst,
-                              unsigned Insn,
-                              uint64_t Address,
-                              const void *Decoder);
-
-
 static DecodeStatus DecodeJumpTarget(MCInst &Inst,
                                      unsigned Insn,
                                      uint64_t Address,
@@ -407,6 +406,17 @@ static DecodeStatus DecodeCCRRegisterClass(MCInst &Inst,
   return MCDisassembler::Success;
 }
 
+static DecodeStatus DecodeFCCRegisterClass(MCInst &Inst,
+                                           unsigned RegNo,
+                                           uint64_t Address,
+                                           const void *Decoder) {
+  if (RegNo > 7)
+    return MCDisassembler::Fail;
+  unsigned Reg = getReg(Decoder, Mips::FCCRegClassID, RegNo);
+  Inst.addOperand(MCOperand::CreateReg(Reg));
+  return MCDisassembler::Success;
+}
+
 static DecodeStatus DecodeMem(MCInst &Inst,
                               unsigned Insn,
                               uint64_t Address,
@@ -529,16 +539,6 @@ static DecodeStatus DecodeBranchTarget(MCInst &Inst,
   return MCDisassembler::Success;
 }
 
-static DecodeStatus DecodeBC1(MCInst &Inst,
-                              unsigned Insn,
-                              uint64_t Address,
-                              const void *Decoder) {
-  unsigned BranchOffset = Insn & 0xffff;
-  BranchOffset = SignExtend32<18>(BranchOffset << 2) + 4;
-  Inst.addOperand(MCOperand::CreateImm(BranchOffset));
-  return MCDisassembler::Success;
-}
-
 static DecodeStatus DecodeJumpTarget(MCInst &Inst,
                                      unsigned Insn,
                                      uint64_t Address,
diff --git a/lib/Target/Mips/InstPrinter/MipsInstPrinter.cpp b/lib/Target/Mips/InstPrinter/MipsInstPrinter.cpp
index 69460cc..6babb74 100644
--- a/lib/Target/Mips/InstPrinter/MipsInstPrinter.cpp
+++ b/lib/Target/Mips/InstPrinter/MipsInstPrinter.cpp
@@ -245,6 +245,14 @@ bool MipsInstPrinter::printAlias(const MCInst &MI, raw_ostream &OS) {
     if (isReg<Mips::ZERO_64>(MI, 1) && printAlias("bnez", MI, 0, 2, OS))
       return true;
     break;
+  case Mips::BC1T:
+    if (isReg<Mips::FCC0>(MI, 0) && printAlias("bc1t", MI, 1, OS))
+      return true;
+    break;
+  case Mips::BC1F:
+    if (isReg<Mips::FCC0>(MI, 0) && printAlias("bc1f", MI, 1, OS))
+      return true;
+    break;
   case Mips::OR:
     if (isReg<Mips::ZERO>(MI, 2) && printAlias("move", MI, 0, 1, OS))
       return true;
diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index ffa077f..10efc8a 100644
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -1438,8 +1438,9 @@ lowerBRCOND(SDValue Op, SelectionDAG &DAG) const
     (Mips::CondCode)cast<ConstantSDNode>(CCNode)->getZExtValue();
   unsigned Opc = invertFPCondCodeUser(CC) ? Mips::BRANCH_F : Mips::BRANCH_T;
   SDValue BrCode = DAG.getConstant(Opc, MVT::i32);
+  SDValue FCC0 = DAG.getRegister(Mips::FCC0, MVT::i32);
   return DAG.getNode(MipsISD::FPBrcond, DL, Op.getValueType(), Chain, BrCode,
-                     Dest, CondRes);
+                     FCC0, Dest, CondRes);
 }
 
 SDValue MipsTargetLowering::
diff --git a/lib/Target/Mips/MipsInstrFPU.td b/lib/Target/Mips/MipsInstrFPU.td
index 6fe469a..3975de0 100644
--- a/lib/Target/Mips/MipsInstrFPU.td
+++ b/lib/Target/Mips/MipsInstrFPU.td
@@ -24,8 +24,9 @@
 //===----------------------------------------------------------------------===//
 
 // Floating Point Compare and Branch
-def SDT_MipsFPBrcond : SDTypeProfile<0, 2, [SDTCisInt<0>,
-                                            SDTCisVT<1, OtherVT>]>;
+def SDT_MipsFPBrcond : SDTypeProfile<0, 3, [SDTCisInt<0>,
+                                            SDTCisVT<1, i32>,
+                                            SDTCisVT<2, OtherVT>]>;
 def SDT_MipsFPCmp : SDTypeProfile<0, 3, [SDTCisSameAs<0, 1>, SDTCisFP<1>,
                                          SDTCisVT<2, i32>]>;
 def SDT_MipsCMovFP : SDTypeProfile<1, 2, [SDTCisSameAs<0, 1>,
@@ -188,13 +189,13 @@ class SWXC1_FT<string opstr, RegisterOperand DRC, RegisterOperand PRC,
 
 class BC1F_FT<string opstr, InstrItinClass Itin,
               SDPatternOperator Op = null_frag>  :
-  InstSE<(outs), (ins brtarget:$offset), !strconcat(opstr, "\t$offset"),
-         [(MipsFPBrcond Op, bb:$offset)], Itin, FrmFI> {
+  InstSE<(outs), (ins FCC:$fcc, brtarget:$offset),
+         !strconcat(opstr, "\t$fcc, $offset"),
+         [(MipsFPBrcond Op, FCC:$fcc, bb:$offset)], Itin, FrmFI> {
   let isBranch = 1;
   let isTerminator = 1;
   let hasDelaySlot = 1;
   let Defs = [AT];
-  let Uses = [FCC0];
 }
 
 class CEQS_FT<string typestr, RegisterClass RC, InstrItinClass Itin,
@@ -502,10 +503,9 @@ let Predicates = [HasMips32r2, IsFP64bit, NoNaNsFPMath, HasStdEnc],
 def MIPS_BRANCH_F  : PatLeaf<(i32 0)>;
 def MIPS_BRANCH_T  : PatLeaf<(i32 1)>;
 
-let DecoderMethod = "DecodeBC1" in {
 def BC1F : BC1F_FT<"bc1f", IIBranch, MIPS_BRANCH_F>, BC1F_FM<0, 0>;
 def BC1T : BC1F_FT<"bc1t", IIBranch, MIPS_BRANCH_T>, BC1F_FM<0, 1>;
-}
+
 //===----------------------------------------------------------------------===//
 // Floating Point Flag Conditions
 //===----------------------------------------------------------------------===//
@@ -558,6 +558,12 @@ def ExtractElementF64 :
             (MipsExtractElementF64 AFGR64RegsOpnd:$src, imm:$n))]>;
 
 //===----------------------------------------------------------------------===//
+// InstAliases.
+//===----------------------------------------------------------------------===//
+def : InstAlias<"bc1t $offset", (BC1T FCC0, brtarget:$offset)>;
+def : InstAlias<"bc1f $offset", (BC1F FCC0, brtarget:$offset)>;
+
+//===----------------------------------------------------------------------===//
 // Floating Point Patterns
 //===----------------------------------------------------------------------===//
 def : MipsPat<(f32 fpimm0), (MTC1 ZERO)>;
diff --git a/lib/Target/Mips/MipsInstrFormats.td b/lib/Target/Mips/MipsInstrFormats.td
index 0ae93b4..61b01c0 100644
--- a/lib/Target/Mips/MipsInstrFormats.td
+++ b/lib/Target/Mips/MipsInstrFormats.td
@@ -665,13 +665,14 @@ class SWXC1_FM<bits<6> funct> {
 }
 
 class BC1F_FM<bit nd, bit tf> {
+  bits<3>  fcc;
   bits<16> offset;
 
   bits<32> Inst;
 
   let Inst{31-26} = 0x11;
   let Inst{25-21} = 0x8;
-  let Inst{20-18} = 0; // cc
+  let Inst{20-18} = fcc;
   let Inst{17} = nd;
   let Inst{16} = tf;
   let Inst{15-0} = offset;