GlobalISel: support irtranslation of icmp instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278969 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/GlobalISel/IRTranslator.h

@@ -132,6 +132,9 @@ class IRTranslator : public MachineFunctionPass {
   /// Translate a phi instruction.
   bool translatePHI(const User &U);
 
+  /// Translate an integer compare instruction (or constant).
+  bool translateICmp(const User &U);
+
   /// Add remaining operands onto phis we've translated. Executed after all
   /// MachineBasicBlocks for the function have been created.
   void finishPendingPhis();
@@ -231,7 +234,6 @@ class IRTranslator : public MachineFunctionPass {
   bool translateAddrSpaceCast(const User &U) { return false; }
   bool translateCleanupPad(const User &U) { return false; }
   bool translateCatchPad(const User &U) { return false; }
-  bool translateICmp(const User &U) { return false; }
   bool translateFCmp(const User &U) { return false; }
   bool translateSelect(const User &U) { return false; }
   bool translateUserOp1(const User &U) { return false; }

include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h

@@ -261,6 +261,14 @@ class MachineIRBuilder {
   ///
   /// \return The newly created instruction.
   MachineInstrBuilder buildTrunc(LLT Ty, unsigned Res, unsigned Op);
+
+  /// Build and insert either a G_ICMP
+  ///
+  /// \pre setBasicBlock or setMI must have been called.
+  ///
+  /// \return a MachineInstrBuilder for the newly created instruction.
+  MachineInstrBuilder buildICmp(ArrayRef<LLT> Tys, CmpInst::Predicate Pred,
+                                unsigned Res, unsigned Op0, unsigned Op1);
 };
 
 } // End namespace llvm.

include/llvm/CodeGen/MachineInstrBuilder.h

@@ -210,6 +210,11 @@ class MachineInstrBuilder {
     return *this;
   }
 
+  const MachineInstrBuilder &addPredicate(CmpInst::Predicate Pred) const {
+    MI->addOperand(*MF, MachineOperand::CreatePredicate(Pred));
+    return *this;
+  }
+
   const MachineInstrBuilder &addSym(MCSymbol *Sym,
                                     unsigned char TargetFlags = 0) const {
     MI->addOperand(*MF, MachineOperand::CreateMCSymbol(Sym, TargetFlags));

include/llvm/CodeGen/MachineOperand.h

@@ -63,7 +63,8 @@ class MachineOperand {
     MO_Metadata,          ///< Metadata reference (for debug info)
     MO_MCSymbol,          ///< MCSymbol reference (for debug/eh info)
     MO_CFIIndex,          ///< MCCFIInstruction index.
-    MO_IntrinsicID,       ///< Intrinsic ID
+    MO_IntrinsicID,       ///< Intrinsic ID for ISel
+    MO_Predicate,         ///< Generic predicate for ISel
   };
 
 private:
@@ -164,6 +165,7 @@ class MachineOperand {
     MCSymbol *Sym;           // For MO_MCSymbol.
     unsigned CFIIndex;       // For MO_CFI.
     Intrinsic::ID IntrinsicID; // For MO_IntrinsicID.
+    unsigned Pred;           // For MO_Predicate
 
     struct {                  // For MO_Register.
       // Register number is in SmallContents.RegNo.
@@ -265,6 +267,7 @@ class MachineOperand {
   bool isMCSymbol() const { return OpKind == MO_MCSymbol; }
   bool isCFIIndex() const { return OpKind == MO_CFIIndex; }
   bool isIntrinsicID() const { return OpKind == MO_IntrinsicID; }
+  bool isPredicate() const { return OpKind == MO_Predicate; }
   //===--------------------------------------------------------------------===//
   // Accessors for Register Operands
   //===--------------------------------------------------------------------===//
@@ -464,6 +467,11 @@ class MachineOperand {
     return Contents.IntrinsicID;
   }
 
+  unsigned getPredicate() const {
+    assert(isPredicate() && "Wrong MachineOperand accessor");
+    return Contents.Pred;
+  }
+
   /// Return the offset from the symbol in this operand. This always returns 0
   /// for ExternalSymbol operands.
   int64_t getOffset() const {
@@ -749,6 +757,12 @@ class MachineOperand {
     return Op;
   }
 
+  static MachineOperand CreatePredicate(unsigned Pred) {
+    MachineOperand Op(MachineOperand::MO_Predicate);
+    Op.Contents.Pred = Pred;
+    return Op;
+  }
+
   friend class MachineInstr;
   friend class MachineRegisterInfo;
 private:

include/llvm/IR/InstrTypes.h

@@ -957,6 +957,8 @@ class CmpInst : public Instruction {
     return P >= FIRST_ICMP_PREDICATE && P <= LAST_ICMP_PREDICATE;
   }
 
+  static StringRef getPredicateName(Predicate P);
+
   bool isFPPredicate() const { return isFPPredicate(getPredicate()); }
   bool isIntPredicate() const { return isIntPredicate(getPredicate()); }
 

include/llvm/Target/GenericOpcodes.td

@@ -160,6 +160,13 @@ def G_ASHR : Instruction {
   let hasSideEffects = 0;
 }
 
+// Generic bitwise or.
+def G_ICMP : Instruction {
+  let OutOperandList = (outs unknown:$dst);
+  let InOperandList = (ins unknown:$tst, unknown:$src1, unknown:$src2);
+  let hasSideEffects = 0;
+}
+
 //------------------------------------------------------------------------------
 // Memory ops
 //------------------------------------------------------------------------------

include/llvm/Target/TargetOpcodes.def

@@ -247,6 +247,9 @@ HANDLE_TARGET_OPCODE(G_LSHR)
 // Generic arithmetic right-shift
 HANDLE_TARGET_OPCODE(G_ASHR)
 
+/// Generic integer-base comparison, also applicable to vectors of integers.
+HANDLE_TARGET_OPCODE(G_ICMP)
+
 /// Generic BRANCH instruction. This is an unconditional branch.
 HANDLE_TARGET_OPCODE(G_BR)
 

lib/CodeGen/GlobalISel/IRTranslator.cpp

@@ -100,6 +100,20 @@ bool IRTranslator::translateBinaryOp(unsigned Opcode, const User &U) {
   return true;
 }
 
+bool IRTranslator::translateICmp(const User &U) {
+  const CmpInst &CI = cast<CmpInst>(U);
+  unsigned Op0 = getOrCreateVReg(*CI.getOperand(0));
+  unsigned Op1 = getOrCreateVReg(*CI.getOperand(1));
+  unsigned Res = getOrCreateVReg(CI);
+  CmpInst::Predicate Pred = CI.getPredicate();
+
+  assert(isa<ICmpInst>(CI) && "only integer comparisons supported now");
+  assert(CmpInst::isIntPredicate(Pred) && "only int comparisons supported now");
+  MIRBuilder.buildICmp({LLT{*CI.getType()}, LLT{*CI.getOperand(0)->getType()}},
+                       Pred, Res, Op0, Op1);
+  return true;
+}
+
 bool IRTranslator::translateRet(const User &U) {
   const ReturnInst &RI = cast<ReturnInst>(U);
   const Value *Ret = RI.getReturnValue();

lib/CodeGen/GlobalISel/MachineIRBuilder.cpp

@@ -184,3 +184,14 @@ MachineInstrBuilder MachineIRBuilder::buildTrunc(LLT Ty, unsigned Res,
                                            unsigned Op) {
   return buildInstr(TargetOpcode::G_TRUNC, Ty).addDef(Res).addUse(Op);
 }
+
+MachineInstrBuilder MachineIRBuilder::buildICmp(ArrayRef<LLT> Tys,
+                                                CmpInst::Predicate Pred,
+                                                unsigned Res, unsigned Op0,
+                                                unsigned Op1) {
+  return buildInstr(TargetOpcode::G_ICMP, Tys)
+      .addDef(Res)
+      .addPredicate(Pred)
+      .addUse(Op0)
+      .addUse(Op1);
+}

lib/CodeGen/MIRParser/MILexer.cpp

@@ -234,6 +234,8 @@ static MIToken::TokenKind getIdentifierKind(StringRef Identifier) {
       .Case("landing-pad", MIToken::kw_landing_pad)
       .Case("liveins", MIToken::kw_liveins)
       .Case("successors", MIToken::kw_successors)
+      .Case("floatpred", MIToken::kw_floatpred)
+      .Case("intpred", MIToken::kw_intpred)
       .Default(MIToken::Identifier);
 }
 

lib/CodeGen/MIRParser/MILexer.h

@@ -91,6 +91,8 @@ struct MIToken {
     kw_landing_pad,
     kw_liveins,
     kw_successors,
+    kw_floatpred,
+    kw_intpred,
 
     // Named metadata keywords
     md_tbaa,

lib/CodeGen/MIRParser/MIParser.cpp

@@ -155,6 +155,7 @@ class MIParser {
   bool parseIRBlock(BasicBlock *&BB, const Function &F);
   bool parseBlockAddressOperand(MachineOperand &Dest);
   bool parseIntrinsicOperand(MachineOperand &Dest);
+  bool parsePredicateOperand(MachineOperand &Dest);
   bool parseTargetIndexOperand(MachineOperand &Dest);
   bool parseLiveoutRegisterMaskOperand(MachineOperand &Dest);
   bool parseMachineOperand(MachineOperand &Dest,
@@ -1469,6 +1470,64 @@ bool MIParser::parseIntrinsicOperand(MachineOperand &Dest) {
   return false;
 }
 
+bool MIParser::parsePredicateOperand(MachineOperand &Dest) {
+  assert(Token.is(MIToken::kw_intpred) || Token.is(MIToken::kw_floatpred));
+  bool IsFloat = Token.is(MIToken::kw_floatpred);
+  lex();
+
+  if (expectAndConsume(MIToken::lparen))
+    return error("expected syntax intpred(whatever) or floatpred(whatever");
+
+  if (Token.isNot(MIToken::Identifier))
+    return error("whatever");
+
+  CmpInst::Predicate Pred;
+  if (IsFloat) {
+    Pred = StringSwitch<CmpInst::Predicate>(Token.stringValue())
+               .Case("false", CmpInst::FCMP_FALSE)
+               .Case("oeq", CmpInst::FCMP_OEQ)
+               .Case("ogt", CmpInst::FCMP_OGT)
+               .Case("oge", CmpInst::FCMP_OGE)
+               .Case("olt", CmpInst::FCMP_OLT)
+               .Case("ole", CmpInst::FCMP_OLE)
+               .Case("one", CmpInst::FCMP_ONE)
+               .Case("ord", CmpInst::FCMP_ORD)
+               .Case("uno", CmpInst::FCMP_UNO)
+               .Case("ueq", CmpInst::FCMP_UEQ)
+               .Case("ugt", CmpInst::FCMP_UGT)
+               .Case("uge", CmpInst::FCMP_UGE)
+               .Case("ult", CmpInst::FCMP_ULT)
+               .Case("ule", CmpInst::FCMP_ULE)
+               .Case("une", CmpInst::FCMP_UNE)
+               .Case("true", CmpInst::FCMP_TRUE)
+               .Default(CmpInst::BAD_FCMP_PREDICATE);
+    if (!CmpInst::isFPPredicate(Pred))
+      return error("invalid floating-point predicate");
+  } else {
+    Pred = StringSwitch<CmpInst::Predicate>(Token.stringValue())
+               .Case("eq", CmpInst::ICMP_EQ)
+               .Case("ne", CmpInst::ICMP_NE)
+               .Case("sgt", CmpInst::ICMP_SGT)
+               .Case("sge", CmpInst::ICMP_SGE)
+               .Case("slt", CmpInst::ICMP_SLT)
+               .Case("sle", CmpInst::ICMP_SLE)
+               .Case("ugt", CmpInst::ICMP_UGT)
+               .Case("uge", CmpInst::ICMP_UGE)
+               .Case("ult", CmpInst::ICMP_ULT)
+               .Case("ule", CmpInst::ICMP_ULE)
+               .Default(CmpInst::BAD_ICMP_PREDICATE);
+    if (!CmpInst::isIntPredicate(Pred))
+      return error("invalid integer predicate");
+  }
+
+  lex();
+  Dest = MachineOperand::CreatePredicate(Pred);
+  if (!expectAndConsume(MIToken::rparen))
+    return error("predicate should be terminated by ')'.");
+
+  return false;
+}
+
 bool MIParser::parseTargetIndexOperand(MachineOperand &Dest) {
   assert(Token.is(MIToken::kw_target_index));
   lex();
@@ -1575,6 +1634,9 @@ bool MIParser::parseMachineOperand(MachineOperand &Dest,
     return parseTargetIndexOperand(Dest);
   case MIToken::kw_liveout:
     return parseLiveoutRegisterMaskOperand(Dest);
+  case MIToken::kw_floatpred:
+  case MIToken::kw_intpred:
+    return parsePredicateOperand(Dest);
   case MIToken::Error:
     return true;
   case MIToken::Identifier:

lib/CodeGen/MIRPrinter.cpp

@@ -891,6 +891,12 @@ void MIPrinter::print(const MachineOperand &Op, const TargetRegisterInfo *TRI,
     }
     break;
   }
+  case MachineOperand::MO_Predicate: {
+    auto Pred = static_cast<CmpInst::Predicate>(Op.getPredicate());
+    OS << (CmpInst::isIntPredicate(Pred) ? "int" : "float") << "pred("
+       << CmpInst::getPredicateName(Pred) << ')';
+    break;
+  }
   }
 }
 

lib/CodeGen/MachineInstr.cpp

@@ -260,6 +260,8 @@ bool MachineOperand::isIdenticalTo(const MachineOperand &Other) const {
     return getMetadata() == Other.getMetadata();
   case MachineOperand::MO_IntrinsicID:
     return getIntrinsicID() == Other.getIntrinsicID();
+  case MachineOperand::MO_Predicate:
+    return getPredicate() == Other.getPredicate();
   }
   llvm_unreachable("Invalid machine operand type");
 }
@@ -306,6 +308,8 @@ hash_code llvm::hash_value(const MachineOperand &MO) {
     return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getCFIIndex());
   case MachineOperand::MO_IntrinsicID:
     return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getIntrinsicID());
+  case MachineOperand::MO_Predicate:
+    return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getPredicate());
   }
   llvm_unreachable("Invalid machine operand type");
 }
@@ -471,8 +475,12 @@ void MachineOperand::print(raw_ostream &OS, ModuleSlotTracker &MST,
       OS << "<intrinsic:" << ID << '>';
     break;
   }
+  case MachineOperand::MO_Predicate: {
+    auto Pred = static_cast<CmpInst::Predicate>(getPredicate());
+    OS << '<' << (CmpInst::isIntPredicate(Pred) ? "intpred" : "floatpred")
+       << CmpInst::getPredicateName(Pred) << '>';
+  }
   }
-
   if (unsigned TF = getTargetFlags())
     OS << "[TF=" << TF << ']';
 }

lib/IR/AsmWriter.cpp

@@ -1,3 +1,4 @@
+
 //===-- AsmWriter.cpp - Printing LLVM as an assembly file -----------------===//
 //
 //                     The LLVM Compiler Infrastructure
@@ -1041,39 +1042,6 @@ static void WriteAsOperandInternal(raw_ostream &Out, const Metadata *MD,
                                    SlotTracker *Machine, const Module *Context,
                                    bool FromValue = false);
 
-static const char *getPredicateText(unsigned predicate) {
-  const char * pred = "unknown";
-  switch (predicate) {
-  case FCmpInst::FCMP_FALSE: pred = "false"; break;
-  case FCmpInst::FCMP_OEQ:   pred = "oeq"; break;
-  case FCmpInst::FCMP_OGT:   pred = "ogt"; break;
-  case FCmpInst::FCMP_OGE:   pred = "oge"; break;
-  case FCmpInst::FCMP_OLT:   pred = "olt"; break;
-  case FCmpInst::FCMP_OLE:   pred = "ole"; break;
-  case FCmpInst::FCMP_ONE:   pred = "one"; break;
-  case FCmpInst::FCMP_ORD:   pred = "ord"; break;
-  case FCmpInst::FCMP_UNO:   pred = "uno"; break;
-  case FCmpInst::FCMP_UEQ:   pred = "ueq"; break;
-  case FCmpInst::FCMP_UGT:   pred = "ugt"; break;
-  case FCmpInst::FCMP_UGE:   pred = "uge"; break;
-  case FCmpInst::FCMP_ULT:   pred = "ult"; break;
-  case FCmpInst::FCMP_ULE:   pred = "ule"; break;
-  case FCmpInst::FCMP_UNE:   pred = "une"; break;
-  case FCmpInst::FCMP_TRUE:  pred = "true"; break;
-  case ICmpInst::ICMP_EQ:    pred = "eq"; break;
-  case ICmpInst::ICMP_NE:    pred = "ne"; break;
-  case ICmpInst::ICMP_SGT:   pred = "sgt"; break;
-  case ICmpInst::ICMP_SGE:   pred = "sge"; break;
-  case ICmpInst::ICMP_SLT:   pred = "slt"; break;
-  case ICmpInst::ICMP_SLE:   pred = "sle"; break;
-  case ICmpInst::ICMP_UGT:   pred = "ugt"; break;
-  case ICmpInst::ICMP_UGE:   pred = "uge"; break;
-  case ICmpInst::ICMP_ULT:   pred = "ult"; break;
-  case ICmpInst::ICMP_ULE:   pred = "ule"; break;
-  }
-  return pred;
-}
-
 static void writeAtomicRMWOperation(raw_ostream &Out,
                                     AtomicRMWInst::BinOp Op) {
   switch (Op) {
@@ -1349,7 +1317,8 @@ static void WriteConstantInternal(raw_ostream &Out, const Constant *CV,
     Out << CE->getOpcodeName();
     WriteOptimizationInfo(Out, CE);
     if (CE->isCompare())
-      Out << ' ' << getPredicateText(CE->getPredicate());
+      Out << ' ' << CmpInst::getPredicateName(
+                        static_cast<CmpInst::Predicate>(CE->getPredicate()));
     Out << " (";
 
     if (const GEPOperator *GEP = dyn_cast<GEPOperator>(CE)) {
@@ -2869,7 +2838,7 @@ void AssemblyWriter::printInstruction(const Instruction &I) {
 
   // Print out the compare instruction predicates
   if (const CmpInst *CI = dyn_cast<CmpInst>(&I))
-    Out << ' ' << getPredicateText(CI->getPredicate());
+    Out << ' ' << CmpInst::getPredicateName(CI->getPredicate());
 
   // Print out the atomicrmw operation
   if (const AtomicRMWInst *RMWI = dyn_cast<AtomicRMWInst>(&I))