GP-5950 Add support for multipath conditional constants

Ghidra/Features/Decompiler/certification.manifest

@@ -17,6 +17,8 @@ src/decompile/datatests/ccmp.xml||GHIDRA||||END|
 src/decompile/datatests/concat.xml||GHIDRA||||END|
 src/decompile/datatests/concatsplit.xml||GHIDRA||||END|
 src/decompile/datatests/condconst.xml||GHIDRA||||END|
+src/decompile/datatests/condconst2.xml||GHIDRA||||END|
+src/decompile/datatests/condconstsub.xml||GHIDRA||||END|
 src/decompile/datatests/condexesub.xml||GHIDRA||||END|
 src/decompile/datatests/condmulti.xml||GHIDRA||||END|
 src/decompile/datatests/convert.xml||GHIDRA||||END|

Ghidra/Features/Decompiler/src/decompile/cpp/coreaction.cc

@@ -4248,6 +4248,40 @@ void ActionConditionalConst::placeMultipleConstants(vector<PcodeOpNode> &phiNode
   }
 }
 
+/// \brief Try to push the constant at the front point through to the output of the given PcodeOp
+///
+/// If successful, create a ConstPoint to search for reads of this new constant.
+/// \param points is the set of points with the current point at the front
+/// \param op is p-code op to push the constant through
+void ActionConditionalConst::pushConstant(list<ConstPoint> &points,PcodeOp *op)
+
+{
+  if ((op->getEvalType() & PcodeOp::special) != 0) return;
+  if (op->getOpcode()->isFloatingPointOp()) return;
+  Varnode *outvn = op->getOut();
+  if (outvn->getSize() > sizeof(uintb)) return;
+  Varnode *vn = points.front().vn;
+  int4 slot = op->getSlot(vn);
+  uintb in[3];
+  for(int4 i=0;i<op->numInput();++i) {
+    if (i == slot)
+      in[i] = points.front().value;
+    else {
+      Varnode *inVn = op->getIn(i);
+      if (inVn->getSize() > sizeof(uintb)) return;
+      if (inVn->isConstant())
+	in[i] = op->getIn(i)->getOffset();
+      else
+	return;		// Not all inputs are constant
+    }
+  }
+  bool evalError;
+  uintb outval = op->executeSimple(in,evalError);
+  if (evalError)
+    return;
+  points.emplace_back(outvn,outval,points.front().constBlock,points.front().inSlot,points.front().blockIsDom);
+}
+
 /// \brief Replace MULTIEQUAL edges with constant if there is no alternate flow
 ///
 /// A given Varnode is known to be constant along a set of MULTIEQUAL edges. If these edges are excised from the
@@ -4297,24 +4331,61 @@ void ActionConditionalConst::handlePhiNodes(Varnode *varVn,Varnode *constVn,vect
   }
 }
 
-/// \brief Replace reads of a given Varnode with a constant.
+/// \brief Test if we can reach the given Varnode via a path other than through the immediate edge
 ///
-/// For each read op, check that is in or dominated by a specific block we known
-/// the Varnode is constant in.
-/// \param varVn is the given Varnode
-/// \param constVn is the constant Varnode to replace with (may be null)
-/// \param constVal is the constant value being propagated
-/// \param constBlock is the block which dominates ops reading the constant value
+/// The given Varnode is an input to a MULTIEQUAL through a specific input slot.  If we can reach the
+/// same Varnode backtracking through one of the other slots, return \b true.  We can backtrack
+/// through MULTIEQUALs up to a given depth and possibly a final INT_ADD.
+/// \param vn is the given Varnode
+/// \param op is the MULTIEQUAL reading \b vn
+/// \param slot is the input index of \b vn
+/// \param depth is the maximum depth to backtrack
+/// \return \b true if an alternate path to the Varnode is found
+bool ActionConditionalConst::testAlternatePath(Varnode *vn,PcodeOp *op,int4 slot,int4 depth)
+
+{
+  for(int4 i=0;i<op->numInput();++i) {
+    if (i == slot) continue;
+    Varnode *inVn = op->getIn(i);
+    if (inVn == vn) return true;
+    if (inVn->isWritten()) {
+      PcodeOp *curOp = inVn->getDef();
+      OpCode opc = curOp->code();
+      if (opc == CPUI_INT_ADD || opc == CPUI_PTRSUB || opc == CPUI_PTRADD) {
+	if (curOp->getIn(0) == vn || curOp->getIn(1) == vn)
+	  return true;
+      }
+      else if (opc == CPUI_MULTIEQUAL) {
+	if (depth == 0) continue;
+	if (testAlternatePath(vn,curOp,-1,depth-1))
+	  return true;
+      }
+    }
+  }
+  return false;
+}
+
+/// \brief At each ConstPoint, replace reads of the Varnode down the constant path with a constant Varnode
+///
+/// Process ConstPoints from the front of the list.
+/// For each read op of current point's Varnode, check if it is in the constant path.
+/// If it is, replace the read with a new constant Varnode.
+/// If not in the constant path, attempt to make the output Varnode into a new ConstPoint that may have
+/// have reads in the constant path.
+/// \param points is the list of ConstPoints
 /// \param useMultiequal is \b true if conditional constants can be applied to MULTIEQUAL ops
 /// \param data is the function being analyzed
-void ActionConditionalConst::propagateConstant(Varnode *varVn,Varnode *constVn,uintb constVal,
-					       FlowBlock *constBlock,bool useMultiequal,Funcdata &data)
+void ActionConditionalConst::propagateConstant(list<ConstPoint> &points,bool useMultiequal,Funcdata &data)
 
 {
   vector<PcodeOpNode> phiNodeEdges;
-  list<PcodeOp *>::const_iterator iter,enditer;
-  iter = varVn->beginDescend();
-  enditer = varVn->endDescend();
+  while(!points.empty()) {
+    ConstPoint &point(points.front());
+    Varnode *varVn = point.vn;
+    Varnode *constVn = point.constVn;
+    FlowBlock *constBlock = point.constBlock;
+    list<PcodeOp *>::const_iterator iter = varVn->beginDescend();
+    list<PcodeOp *>::const_iterator enditer = varVn->endDescend();
     while(iter != enditer) {
       PcodeOp *op = *iter;
       while(iter != enditer && *iter == op)
@@ -4328,6 +4399,17 @@ void ActionConditionalConst::propagateConstant(Varnode *varVn,Varnode *constVn,u
 	if (varVn->isAddrTied() && varVn->getAddr() == op->getOut()->getAddr())
 	  continue;
 	FlowBlock *bl = op->getParent();
+	if (bl == constBlock) {		// The immediate edge from the conditional block, coming into a MULTIEQUAL
+	  if (op->getIn(point.inSlot) == varVn) {
+	    // Its possible the compiler still intends the constant value to be the same variable
+	    // Test for conditions when this is likely so we don't unnecessarily create a new variable
+	    if (point.value > 1) continue;
+	    if (op->getOut()->isAddrTied()) continue;
+	    if (testAlternatePath(varVn, op, point.inSlot, 2)) continue;
+	    phiNodeEdges.emplace_back(op,point.inSlot);
+	  }
+	}
+	else if (point.blockIsDom) {
 	  for(int4 slot=0;slot<op->numInput();++slot) {
 	    if (op->getIn(slot) == varVn) {
 	      if (constBlock->dominates(bl->getIn(slot))) {
@@ -4335,6 +4417,7 @@ void ActionConditionalConst::propagateConstant(Varnode *varVn,Varnode *constVn,u
 	      }
 	    }
 	  }
+	}
 	continue;
       }
       else if (opc == CPUI_COPY) {		// Don't propagate into COPY unless...
@@ -4344,9 +4427,10 @@ void ActionConditionalConst::propagateConstant(Varnode *varVn,Varnode *constVn,u
 	if (followOp->code() == CPUI_COPY) continue;
 						// ...unless COPY is into something more interesting
       }
+      if (!point.blockIsDom) continue;
       if (constBlock->dominates(op->getParent())) {
 	if (constVn == (Varnode *)0)
-	constVn = data.newConstant(varVn->getSize(), constVal);
+	  constVn = data.newConstant(varVn->getSize(), point.value);
 	if (opc == CPUI_RETURN) {
           // CPUI_RETURN ops can't directly take constants
           // as inputs
@@ -4363,12 +4447,63 @@ void ActionConditionalConst::propagateConstant(Varnode *varVn,Varnode *constVn,u
 	}
 	count += 1;			// We made a change
       }
+      else {
+	pushConstant(points, op);
+      }
     }
     if (!phiNodeEdges.empty()) {
       if (constVn == (Varnode *)0)
-      constVn = data.newConstant(varVn->getSize(), constVal);
+	constVn = data.newConstant(varVn->getSize(), point.value);
       handlePhiNodes(varVn, constVn, phiNodeEdges, data);
+      phiNodeEdges.clear();
     }
+    points.pop_front();
+  }
+}
+
+/// \brief Find a Varnode being compared to a constant creating the given CBRANCH boolean
+///
+/// If the boolean is created by comparing a Varnode to a constant, create a ConstPoint record
+/// indicating the path down which the Varnode can be considered constant.
+/// \param points will hold any new ConstPoint
+/// \param boolVn is the given CBRANCH boolean
+/// \param bl is the block constaining the CBRANCH
+/// \param blockDom is an array of booleans indicating along which out edges a constant could be pushed
+/// \param flipEdge is \b true if the meaning of the CBRANCH has been flipped
+void ActionConditionalConst::findConstCompare(list<ConstPoint> &points,Varnode *boolVn,FlowBlock *bl,
+					      bool *blockDom,bool flipEdge)
+{
+  if (!boolVn->isWritten()) return;
+  PcodeOp *compOp = boolVn->getDef();
+  OpCode opc = compOp->code();
+  if (opc == CPUI_BOOL_NEGATE) {
+    flipEdge = !flipEdge;
+    boolVn = compOp->getIn(0);
+    if (!boolVn->isWritten()) return;
+    compOp = boolVn->getDef();
+    opc = compOp->code();
+  }
+  int4 constEdge;			// Out edge where value is constant
+  if (opc == CPUI_INT_EQUAL)
+    constEdge = 1;
+  else if (opc == CPUI_INT_NOTEQUAL)
+    constEdge = 0;
+  else
+    return;
+  // Find the variable and verify that it is compared to a constant
+  Varnode *varVn = compOp->getIn(0);
+  Varnode *constVn = compOp->getIn(1);
+  if (!constVn->isConstant()) {
+    if (!varVn->isConstant())
+      return;
+    Varnode *tmp = constVn;
+    constVn = varVn;
+    varVn = tmp;
+  }
+  if (varVn->loneDescend() != (PcodeOp *)0) return;
+  if (flipEdge)
+    constEdge = 1 - constEdge;
+  points.emplace_back(varVn,constVn,bl->getOut(constEdge),bl->getOutRevIndex(constEdge),blockDom[constEdge]);
 }
 
 int4 ActionConditionalConst::apply(Funcdata &data)
@@ -4384,55 +4519,23 @@ int4 ActionConditionalConst::apply(Funcdata &data)
       useMultiequal = false;	// Don't propagate into MULTIEQUAL
   }
   const BlockGraph &blockGraph(data.getBasicBlocks());
-  bool blockdom[2];
+  bool blockDom[2];
+  list<ConstPoint> points;
   for(int4 i=0;i<blockGraph.getSize();++i) {
     FlowBlock *bl = blockGraph.getBlock(i);
     PcodeOp *cBranch = bl->lastOp();
     if (cBranch == (PcodeOp *)0 || cBranch->code() != CPUI_CBRANCH) continue;
     Varnode *boolVn = cBranch->getIn(1);
-    blockdom[0] = bl->getOut(0)->restrictedByConditional(bl);	// Make sure boolean constant holds down false branch
-    blockdom[1] = bl->getOut(1)->restrictedByConditional(bl);
-    if (!blockdom[0] && !blockdom[1]) continue;
+    blockDom[0] = bl->getOut(0)->restrictedByConditional(bl);	// Make sure boolean constant holds down false branch
+    blockDom[1] = bl->getOut(1)->restrictedByConditional(bl);
     bool flipEdge = cBranch->isBooleanFlip();
     if (boolVn->loneDescend() == (PcodeOp *)0) {	// If the boolean is read more than once
       // Search for implied constants, bool=0 down false branch, bool=1 down true branch
-      if (blockdom[0])
-	propagateConstant(boolVn, (Varnode *)0, flipEdge ? 1 : 0, bl->getFalseOut(), useMultiequal, data);
-      if (blockdom[1])
-	propagateConstant(boolVn, (Varnode *)0, flipEdge ? 0 : 1, bl->getTrueOut(), useMultiequal, data);
+      points.emplace_back(boolVn, flipEdge ? 1 : 0, bl->getFalseOut(),bl->getOutRevIndex(0),blockDom[0]);
+      points.emplace_back(boolVn, flipEdge ? 0 : 1, bl->getTrueOut(),bl->getOutRevIndex(1),blockDom[1]);
     }
-    if (!boolVn->isWritten()) continue;
-    PcodeOp *compOp = boolVn->getDef();
-    OpCode opc = compOp->code();
-    if (opc == CPUI_BOOL_NEGATE) {
-      flipEdge = !flipEdge;
-      boolVn = compOp->getIn(0);
-      if (!boolVn->isWritten()) continue;
-      compOp = boolVn->getDef();
-      opc = compOp->code();
-    }
-    int4 constEdge;			// Out edge where value is constant
-    if (opc == CPUI_INT_EQUAL)
-      constEdge = 1;
-    else if (opc == CPUI_INT_NOTEQUAL)
-      constEdge = 0;
-    else
-      continue;
-    // Find the variable and verify that it is compared to a constant
-    Varnode *varVn = compOp->getIn(0);
-    Varnode *constVn = compOp->getIn(1);
-    if (!constVn->isConstant()) {
-      if (!varVn->isConstant())
-	continue;
-      Varnode *tmp = constVn;
-      constVn = varVn;
-      varVn = tmp;
-    }
-    if (varVn->loneDescend() != (PcodeOp *)0) continue;
-    if (flipEdge)
-      constEdge = 1 - constEdge;
-    if (!blockdom[constEdge]) continue;	// Make sure condition holds
-    propagateConstant(varVn,constVn,0,bl->getOut(constEdge),useMultiequal,data);
+    findConstCompare(points, boolVn, bl, blockDom, flipEdge);
+    propagateConstant(points, useMultiequal, data);
   }
   return 0;
 }

Ghidra/Features/Decompiler/src/decompile/cpp/coreaction.hh

@@ -567,14 +567,30 @@ public:
 
 /// \brief Propagate conditional constants
 class ActionConditionalConst : public Action {
+  /// \brief Description of a point in control-flow where a Varnode can propagate as a constant down a conditional branch
+  struct ConstPoint {
+    Varnode *vn;		///< Varnode that is constant for some reads
+    Varnode *constVn;		///< Representative of the constant (may be null)
+    uintb value;		///< The constant value
+    FlowBlock *constBlock;	///< Block that dominates all reads where vn is constant
+    int4 inSlot;		///< Input edge from condition block
+    bool blockIsDom;		///< Is \b true if block is dominated by constant path
+    ConstPoint(Varnode *v,Varnode *c,FlowBlock *bl,int4 slot,bool isDom) {
+      vn = v; constVn = c; value = c->getOffset(); constBlock = bl; inSlot = slot; blockIsDom = isDom; }	///< Construct from constant Varnode
+    ConstPoint(Varnode *v,uintb val,FlowBlock *bl,int4 slot,bool isDom) {
+      vn = v; constVn = (Varnode *)0; value = val; constBlock = bl; inSlot = slot; blockIsDom = isDom; }	///< Construct from constant value
+  };
   static void clearMarks(const vector<PcodeOp *> &opList);
   static void collectReachable(Varnode *vn,vector<PcodeOpNode> &phiNodeEdges,vector<PcodeOp *> &reachable);
   static bool flowToAlternatePath(PcodeOp *op);
   static bool flowTogether(const vector<PcodeOpNode> &edges,int4 i,vector<int4> &result);
   static Varnode *placeCopy(PcodeOp *op,BlockBasic *bl,Varnode *constVn,Funcdata &data);
+  static void findConstCompare(list<ConstPoint> &points,Varnode *boolVn,FlowBlock *bl,bool *blockDom,bool flipEdge);
+  static void pushConstant(list<ConstPoint> &points,PcodeOp *op);
   static void placeMultipleConstants(vector<PcodeOpNode> &phiNodeEdges,vector<int4> &marks,Varnode *constVn,Funcdata &data);
   void handlePhiNodes(Varnode *varVn,Varnode *constVn,vector<PcodeOpNode> &phiNodeEdges,Funcdata &data);
-  void propagateConstant(Varnode *varVn,Varnode *constVn,uintb constVal,FlowBlock *constBlock,bool useMultiequal,Funcdata &data);
+  bool testAlternatePath(Varnode *vn,PcodeOp *op,int4 slot,int4 depth);
+  void propagateConstant(list<ConstPoint> &points,bool useMultiequal,Funcdata &data);
 public:
   ActionConditionalConst(const string &g) : Action(0,"condconst",g) {}	///< Constructor
   virtual Action *clone(const ActionGroupList &grouplist) const {

Ghidra/Features/Decompiler/src/decompile/cpp/double.cc

@@ -2169,6 +2169,7 @@ bool LessThreeWay::normalizeHi(void)
   }
   hiconstform = false;
   if (vnhil2->isConstant()) {
+    if (in.getSize() > sizeof(uintb)) return false;	// Must have enough precision for constant
     hiconstform = true;
     hival = vnhil2->getOffset();
     SplitVarnode::getTrueFalse(hilessbool,hiflip,hilesstrue,hilessfalse);

Ghidra/Features/Decompiler/src/decompile/cpp/op.cc

@@ -471,6 +471,32 @@ uintb PcodeOp::collapse(bool &markedInput) const {
   throw LowlevelError("Invalid constant collapse");
 }
 
+/// The p-code op must be \e special, or an exception is thrown.  The operation is performed
+/// and if there is no evaluation error, the result is returned and \b evalError is set to \b false.
+/// \param in is an array of input values
+/// \return the result of applying \b this operation to the input values
+uintb PcodeOp::executeSimple(uintb *in,bool &evalError) const
+
+{
+  uint4 evalType = getEvalType();
+  uintb res;
+  try {
+    if (evalType == PcodeOp::unary)
+      res = opcode->evaluateUnary(output->getSize(),inrefs[0]->getSize(),in[0]);
+    else if (evalType == PcodeOp::binary)
+      res = opcode->evaluateBinary(output->getSize(),inrefs[0]->getSize(),in[0],in[1]);
+    else if (evalType == PcodeOp::ternary)
+      res = opcode->evaluateTernary(output->getSize(),inrefs[0]->getSize(),in[0],in[1],in[2]);
+    else
+      throw LowlevelError("Cannot perform simple execution of "+(string)get_opname(code()));
+  } catch(EvaluationError &err) {
+    evalError = true;
+    return 0;
+  }
+  evalError = false;
+  return res;
+}
+
 /// Knowing that \b this PcodeOp has collapsed its constant inputs, one of which has
 /// symbol content, figure out if the symbol should propagate to the new given output constant.
 /// \param newConst is the given output constant

Ghidra/Features/Decompiler/src/decompile/cpp/op.hh

@@ -233,6 +233,7 @@ public:
   OpCode code(void) const { return opcode->getOpcode(); } ///< Get the opcode id (enum) for this op
   bool isCommutative(void) const { return ((flags & PcodeOp::commutative)!=0); } ///< Return \b true if inputs commute
   uintb collapse(bool &markedInput) const;	///< Calculate the constant output produced by this op
+  uintb executeSimple(uintb *in,bool &evalError) const;		///< Execute \b this operation on the given input values
   void collapseConstantSymbol(Varnode *newConst) const;	///< Propagate constant symbol from inputs to given output
   PcodeOp *nextOp(void) const;	///< Return the next op in the control-flow from this or \e null
   PcodeOp *previousOp(void) const; ///< Return the previous op within this op's basic block or \e null

Ghidra/Features/Decompiler/src/decompile/cpp/opbehavior.cc

@@ -130,6 +130,19 @@ uintb OpBehavior::evaluateBinary(int4 sizeout,int4 sizein,uintb in1,uintb in2) c
   throw LowlevelError("Binary emulation unimplemented for "+name);
 }
 
+/// \param sizeout is the size of the output in bytes
+/// \param sizein is the size of the inputs in bytes
+/// \param in1 is the first input value
+/// \param in2 is the second input value
+/// \param in3 is the third input value
+/// \return the output value
+uintb OpBehavior::evaluateTernary(int4 sizeout,int4 sizein,uintb in1,uintb in2,uintb in3) const
+
+{
+  string name(get_opname(opcode));
+  throw LowlevelError("Ternary emulation unimplemented for "+name);
+}
+
 /// If the output value is known, recover the input value.
 /// \param sizeout is the size of the output in bytes
 /// \param out is the output value
@@ -752,6 +765,20 @@ uintb OpBehaviorSubpiece::evaluateBinary(int4 sizeout,int4 sizein,uintb in1,uint
   return res;
 }
 
+uintb OpBehaviorPtradd::evaluateTernary(int4 sizeout,int4 sizein,uintb in1,uintb in2,uintb in3) const
+
+{
+  uintb res = (in1 + in2 * in3) & calc_mask(sizeout);
+  return res;
+}
+
+uintb OpBehaviorPtrsub::evaluateBinary(int4 sizeout,int4 sizein,uintb in1,uintb in2) const
+
+{
+  uintb res = (in1 + in2) & calc_mask(sizeout);
+  return res;
+}
+
 uintb OpBehaviorPopcount::evaluateUnary(int4 sizeout,int4 sizein,uintb in1) const
 
 {

Ghidra/Features/Decompiler/src/decompile/cpp/opbehavior.hh

@@ -67,6 +67,9 @@ public:
   /// \brief Emulate the binary op-code on input values
   virtual uintb evaluateBinary(int4 sizeout,int4 sizein,uintb in1,uintb in2) const;
 
+  /// \brief Emulate the ternary op-code on input values
+  virtual uintb evaluateTernary(int4 sizeout,int4 sizein,uintb in1,uintb in2,uintb in3) const;
+
   /// \brief Reverse the binary op-code operation, recovering an input value
   virtual uintb recoverInputBinary(int4 slot,int4 sizeout,uintb out,int4 sizein,uintb in) const;
   
@@ -506,6 +509,20 @@ public:
   virtual uintb evaluateBinary(int4 sizeout,int4 sizein,uintb in1,uintb in2) const;
 };
 
+/// CPUI_PTRADD behavior
+class OpBehaviorPtradd : public OpBehavior {
+public:
+  OpBehaviorPtradd(void) : OpBehavior(CPUI_PTRADD,false) {}	///< Constructor
+  virtual uintb evaluateTernary(int4 sizeout,int4 sizein,uintb in1,uintb in2,uintb in3) const;
+};
+
+/// CPUI_PTRSUB behavior
+class OpBehaviorPtrsub : public OpBehavior {
+public:
+  OpBehaviorPtrsub(void) : OpBehavior(CPUI_PTRSUB,false) {}	///< Constructor
+  virtual uintb evaluateBinary(int4 sizeout,int4 sizein,uintb in1,uintb in2) const;
+};
+
 /// CPUI_POPCOUNT behavior
 class OpBehaviorPopcount : public OpBehavior {
 public:

Ghidra/Features/Decompiler/src/decompile/cpp/typeop.cc

@@ -2226,7 +2226,7 @@ TypeOpPtradd::TypeOpPtradd(TypeFactory *t) : TypeOp(t,CPUI_PTRADD,"+")
 {
   opflags = PcodeOp::ternary | PcodeOp::nocollapse;
   addlflags = arithmetic_op;
-  behave = new OpBehavior(CPUI_PTRADD,false); // Dummy behavior
+  behave = new OpBehaviorPtradd();
 }
 
 Datatype *TypeOpPtradd::getInputLocal(const PcodeOp *op,int4 slot) const
@@ -2296,7 +2296,7 @@ TypeOpPtrsub::TypeOpPtrsub(TypeFactory *t) : TypeOp(t,CPUI_PTRSUB,"->")
 				// allow this to be commutative.
   opflags = PcodeOp::binary|PcodeOp::nocollapse;
   addlflags = arithmetic_op;
-  behave = new OpBehavior(CPUI_PTRSUB,false); // Dummy behavior
+  behave = new OpBehaviorPtrsub();
 }
 
 Datatype *TypeOpPtrsub::getOutputLocal(const PcodeOp *op) const

Ghidra/Features/Decompiler/src/decompile/cpp/typeop.hh

@@ -91,6 +91,17 @@ public:
   uintb evaluateBinary(int4 sizeout,int4 sizein,uintb in1,uintb in2) const {
     return behave->evaluateBinary(sizeout,sizein,in1,in2); }
 
+  /// \brief Emulate the ternary op-code on an input value
+  ///
+  /// \param sizeout is the size of the output in bytes
+  /// \param sizein is the size of the inputs in bytes
+  /// \param in1 is the first input value
+  /// \param in2 is the second input value
+  /// \param in3 is the third input value
+  /// \return the output value
+  uintb evaluateTernary(int4 sizeout,int4 sizein,uintb in1,uintb in2,uintb in3) const {
+    return behave->evaluateTernary(sizeout,sizein,in1,in2,in3); }
+
   /// \brief Reverse the binary op-code operation, recovering a constant input value
   ///
   /// If the output value and one of the input values is known, recover the value

Ghidra/Features/Decompiler/src/decompile/datatests/condconst2.xml

@@ -0,0 +1,45 @@
+<decompilertest>
+<binaryimage arch="ARM:LE:32:v8:default">
+<!--
+      Examples of conditional constants being immediately passed to MULTIEQUAL after the branch
+-->
+<bytechunk space="ram" offset="0x4022871a">
+                    00b970478160
+6120fbe7
+</bytechunk>
+<bytechunk space="ram" offset="0x40228728">
+                0b4601b107330360
+7047
+</bytechunk>
+<bytechunk space="ram" offset="0x40228736">
+            087a613818bf01207047
+</bytechunk>
+<symbol space="ram" offset="0x4022871a" name="zeroprop"/>
+<symbol space="ram" offset="0x40228728" name="throughadd"/>
+<symbol space="ram" offset="0x40228736" name="condmove"/>
+<symbol space="ram" offset="0x40228758" name="myfunc"/>
+</binaryimage>
+<script>
+  <com>set context TMode 1 [ram,0x4022871a] [ram,0x40228800]</com>
+  <com>parse line extern char zeroprop(int4 *ptrint,int4 val);</com>
+  <com>parse line extern void throughadd(int4 *tadd,int4 tval);</com>
+  <com>parse line extern bool condmove(int4 cval,char *cptr);</com>
+  <com>lo fu zeroprop</com>
+  <com>decompile</com>
+  <com>print C</com>
+  <com>lo fu throughadd</com>
+  <com>decompile</com>
+  <com>print C</com>
+  <com>lo fu condmove</com>
+  <com>decompile</com>
+  <com>print C</com>
+</script>
+<stringmatch name="Immediate Conditional #1" min="0" max="0">\(char\)ptrint</stringmatch>
+<stringmatch name="Immediate Conditional #2" min="1" max="1">return cVar1;</stringmatch>
+<stringmatch name="Immediate Conditional #3" min="1" max="1">cVar1 = '\\0';</stringmatch>
+<stringmatch name="Immediate Conditional #4" min="1" max="1">cVar1 = 'a';</stringmatch>
+<stringmatch name="Immediate Conditional #5" min="1" max="1">\*tadd = tval;</stringmatch>
+<stringmatch name="Immediate Conditional #6" min="1" max="1">tval = tval \+ 7;</stringmatch>
+<stringmatch name="Immediate Conditional #7" min="1" max="1">return cptr\[8\] != 'a';</stringmatch>
+<stringmatch name="Immediate Conditional #8" min="0" max="0">SUB</stringmatch>
+</decompilertest>

Ghidra/Features/Decompiler/src/decompile/datatests/condconstsub.xml

@@ -0,0 +1,23 @@
+<decompilertest>
+<binaryimage arch="AARCH64:LE:64:v8A:default">
+<!--
+   Example of conditional constant operated on prior to branch
+-->
+<bytechunk space="ram" offset="0x110320" readonly="true">
+400000b40b000014c0035fd6
+</bytechunk>
+</binaryimage>
+<script>
+  <com>map fun r0x110320 foo</com>
+  <com>override flow r0x110324 callreturn</com>
+  <com>map fun r0x110350 otherfunc</com>
+  <com>parse line extern int4 foo(void *ptr);</com>
+  <com>lo fu foo</com>
+  <com>decompile</com>
+  <com>print C</com>
+</script>
+<stringmatch name="Modified conditional constant #1" min="1" max="1">return 0;</stringmatch>
+<stringmatch name="Modified conditional constant #2" min="1" max="1">iVar1 = otherfunc\(\);</stringmatch>
+<stringmatch name="Modified conditional constant #3" min="1" max="1">return iVar1;</stringmatch>
+<stringmatch name="Modified conditional constant #4" min="0" max="0">\(int4\)ptr</stringmatch>
+</decompilertest>