1 #include "satencoder.h"
7 Edge getElementValueConstraint(SATEncoder* This, Element* elem, uint64_t value) {
8 switch(getElementEncoding(elem)->type){
10 return getElementValueOneHotConstraint(This, elem, value);
12 return getElementValueUnaryConstraint(This, elem, value);
14 return getElementValueBinaryIndexConstraint(This, elem, value);
19 return getElementValueBinaryValueConstraint(This, elem, value);
28 Edge getElementValueBinaryIndexConstraint(SATEncoder * This, Element* elem, uint64_t value) {
29 ASTNodeType type = GETELEMENTTYPE(elem);
30 ASSERT(type == ELEMSET || type == ELEMFUNCRETURN);
31 ElementEncoding* elemEnc = getElementEncoding(elem);
32 for(uint i=0; i<elemEnc->encArraySize; i++){
33 if(isinUseElement(elemEnc, i) && elemEnc->encodingArray[i]==value) {
34 return (elemEnc->numVars == 0) ? E_True: generateBinaryConstraint(This->cnf, elemEnc->numVars, elemEnc->variables, i);
40 Edge getElementValueOneHotConstraint(SATEncoder * This, Element* elem, uint64_t value) {
41 ASTNodeType type = GETELEMENTTYPE(elem);
42 ASSERT(type == ELEMSET || type == ELEMFUNCRETURN);
43 ElementEncoding* elemEnc = getElementEncoding(elem);
44 for(uint i=0; i<elemEnc->encArraySize; i++){
45 if (isinUseElement(elemEnc, i) && elemEnc->encodingArray[i]==value) {
46 return elemEnc->variables[i];
52 Edge getElementValueUnaryConstraint(SATEncoder * This, Element* elem, uint64_t value) {
53 ASTNodeType type = GETELEMENTTYPE(elem);
54 ASSERT(type == ELEMSET || type == ELEMFUNCRETURN);
55 ElementEncoding* elemEnc = getElementEncoding(elem);
56 for(uint i=0; i<elemEnc->encArraySize; i++){
57 if (isinUseElement(elemEnc, i) && elemEnc->encodingArray[i]==value) {
59 return constraintNegate(elemEnc->variables[0]);
60 else if ((i+1)==elemEnc->encArraySize)
61 return elemEnc->variables[i-1];
63 return constraintAND2(This->cnf, elemEnc->variables[i-1], constraintNegate(elemEnc->variables[i]));
69 Edge getElementValueBinaryValueConstraint(SATEncoder * This, Element* element, uint64_t value){
70 ASTNodeType type = GETELEMENTTYPE(element);
71 ASSERT(type == ELEMSET || type == ELEMFUNCRETURN);
72 ElementEncoding* elemEnc = getElementEncoding(element);
73 if (elemEnc->low <= elemEnc->high) {
74 if (value < elemEnc->low || value > elemEnc->high)
77 //Range wraps around 0
78 if (value < elemEnc->low && value > elemEnc->high)
82 uint64_t valueminusoffset=value-elemEnc->offset;
83 return generateBinaryConstraint(This->cnf, elemEnc->numVars, elemEnc->variables, valueminusoffset);
86 void allocElementConstraintVariables(ElementEncoding* This, uint numVars) {
87 This->numVars = numVars;
88 This->variables = ourmalloc(sizeof(Edge) * numVars);
91 void generateBinaryValueEncodingVars(SATEncoder* This, ElementEncoding* encoding){
92 ASSERT(encoding->type==BINARYVAL);
93 allocElementConstraintVariables(encoding, encoding->numBits);
94 getArrayNewVarsSATEncoder(This, encoding->numVars, encoding->variables);
97 void generateBinaryIndexEncodingVars(SATEncoder *This, ElementEncoding *encoding) {
98 ASSERT(encoding->type==BINARYINDEX);
99 allocElementConstraintVariables(encoding, NUMBITS(encoding->encArraySize-1));
100 getArrayNewVarsSATEncoder(This, encoding->numVars, encoding->variables);
103 void generateOneHotEncodingVars(SATEncoder *This, ElementEncoding *encoding) {
104 allocElementConstraintVariables(encoding, encoding->encArraySize);
105 getArrayNewVarsSATEncoder(This, encoding->numVars, encoding->variables);
106 for(uint i=0;i<encoding->numVars;i++) {
107 for(uint j=i+1;j<encoding->numVars;j++) {
108 addConstraintCNF(This->cnf, constraintNegate(constraintAND2(This->cnf, encoding->variables[i], encoding->variables[j])));
111 addConstraintCNF(This->cnf, constraintOR(This->cnf, encoding->numVars, encoding->variables));
114 void generateUnaryEncodingVars(SATEncoder *This, ElementEncoding *encoding) {
115 allocElementConstraintVariables(encoding, encoding->encArraySize-1);
116 getArrayNewVarsSATEncoder(This, encoding->numVars, encoding->variables);
117 //Add unary constraint
118 for(uint i=1;i<encoding->numVars;i++) {
119 addConstraintCNF(This->cnf, constraintOR2(This->cnf, encoding->variables[i-1], constraintNegate(encoding->variables[i])));
123 void generateElementEncoding(SATEncoder* This, Element * element) {
124 ElementEncoding* encoding = getElementEncoding(element);
125 ASSERT(encoding->type!=ELEM_UNASSIGNED);
126 if(encoding->variables!=NULL)
128 switch(encoding->type) {
130 generateOneHotEncodingVars(This, encoding);
133 generateBinaryIndexEncodingVars(This, encoding);
136 generateUnaryEncodingVars(This, encoding);
141 generateBinaryValueEncodingVars(This, encoding);