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);
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 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) {
58 if ((i+1)==elemEnc->encArraySize)
59 return elemEnc->variables[i];
61 return constraintAND2(This->cnf, elemEnc->variables[i], constraintNegate(elemEnc->variables[i+1]));
67 void allocElementConstraintVariables(ElementEncoding* This, uint numVars) {
68 This->numVars = numVars;
69 This->variables = ourmalloc(sizeof(Edge) * numVars);
72 void generateBinaryIndexEncodingVars(SATEncoder *This, ElementEncoding *encoding) {
73 ASSERT(encoding->type==BINARYINDEX);
74 allocElementConstraintVariables(encoding, NUMBITS(encoding->encArraySize-1));
75 getArrayNewVarsSATEncoder(This, encoding->numVars, encoding->variables);
78 void generateOneHotEncodingVars(SATEncoder *This, ElementEncoding *encoding) {
79 allocElementConstraintVariables(encoding, encoding->encArraySize);
80 getArrayNewVarsSATEncoder(This, encoding->numVars, encoding->variables);
81 for(uint i=0;i<encoding->numVars;i++) {
82 for(uint j=0;j<encoding->numVars;j++) {
83 addConstraintCNF(This->cnf, constraintIMPLIES(This->cnf, encoding->variables[i], constraintNegate(encoding->variables[j])));
86 addConstraintCNF(This->cnf, constraintOR(This->cnf, encoding->numVars, encoding->variables));
89 void generateUnaryEncodingVars(SATEncoder *This, ElementEncoding *encoding) {
90 allocElementConstraintVariables(encoding, encoding->encArraySize);
91 getArrayNewVarsSATEncoder(This, encoding->numVars, encoding->variables);
92 //Add unary constraint
93 for(uint i=1;i<encoding->numVars;i++) {
94 addConstraintCNF(This->cnf, constraintOR2(This->cnf, encoding->variables[i-1], constraintNegate(encoding->variables[i])));
98 void generateElementEncoding(SATEncoder* This, Element * element) {
99 ElementEncoding* encoding = getElementEncoding(element);
100 ASSERT(encoding->type!=ELEM_UNASSIGNED);
101 if(encoding->variables!=NULL)
103 switch(encoding->type) {
105 generateOneHotEncodingVars(This, encoding);
108 generateBinaryIndexEncodingVars(This, encoding);
111 generateUnaryEncodingVars(This, encoding);