AstNode* createSenItemEquation(AstSenItem* nodep) {
// We know the var is clean, and one bit, so we use binary ops
// for speed instead of logical ops.
// POSEDGE: var & ~var_last
// NEGEDGE: ~var & var_last
// BOTHEDGE: var ^ var_last
// HIGHEDGE: var
// LOWEDGE: ~var
AstNode* newp = NULL;
if (nodep->edgeType()==AstEdgeType::ET_ILLEGAL) {
if (!v3Global.opt.bboxUnsup()) {
nodep->v3error("Unsupported: Complicated event expression in sensitive activity list");
}
return NULL;
}
AstVarScope* clkvscp = nodep->varrefp()->varScopep();
if (nodep->edgeType()==AstEdgeType::ET_POSEDGE) {
AstVarScope* lastVscp = getCreateLastClk(clkvscp);
newp = new AstAnd(nodep->fileline(),
new AstVarRef(nodep->fileline(),
nodep->varrefp()->varScopep(), false),
new AstNot(nodep->fileline(),
new AstVarRef(nodep->fileline(),
lastVscp, false)));
} else if (nodep->edgeType()==AstEdgeType::ET_NEGEDGE) {
AstVarScope* lastVscp = getCreateLastClk(clkvscp);
newp = new AstAnd(nodep->fileline(),
new AstNot(nodep->fileline(),
new AstVarRef(nodep->fileline(),
nodep->varrefp()->varScopep(), false)),
new AstVarRef(nodep->fileline(), lastVscp, false));
} else if (nodep->edgeType()==AstEdgeType::ET_BOTHEDGE) {
AstVarScope* lastVscp = getCreateLastClk(clkvscp);
newp = new AstXor(nodep->fileline(),
new AstVarRef(nodep->fileline(),
nodep->varrefp()->varScopep(), false),
new AstVarRef(nodep->fileline(), lastVscp, false));
} else if (nodep->edgeType()==AstEdgeType::ET_HIGHEDGE) {
newp = new AstVarRef(nodep->fileline(),
clkvscp, false);
} else if (nodep->edgeType()==AstEdgeType::ET_LOWEDGE) {
newp = new AstNot(nodep->fileline(),
new AstVarRef(nodep->fileline(),
clkvscp, false));
} else {
nodep->v3fatalSrc("Bad edge type");
}
return newp;
}
AstNode* createSenItemEquation(AstSenItem* nodep) {
// We know the var is clean, and one bit, so we use binary ops
// for speed instead of logical ops.
// POSEDGE: var & ~var_last
// NEGEDGE: ~var & var_last
// BOTHEDGE: var ^ var_last
// HIGHEDGE: var
// LOWEDGE: ~var
AstNode* newp = NULL;
AstVarScope* clkvscp = nodep->varrefp()->varScopep();
if (nodep->edgeType()==AstEdgeType::ET_POSEDGE) {
AstVarScope* lastVscp = getCreateLastClk(clkvscp);
newp = new AstAnd(nodep->fileline(),
new AstVarRef(nodep->fileline(),
nodep->varrefp()->varScopep(), false),
new AstNot(nodep->fileline(),
new AstVarRef(nodep->fileline(),
lastVscp, false)));
} else if (nodep->edgeType()==AstEdgeType::ET_NEGEDGE) {
AstVarScope* lastVscp = getCreateLastClk(clkvscp);
newp = new AstAnd(nodep->fileline(),
new AstNot(nodep->fileline(),
new AstVarRef(nodep->fileline(),
nodep->varrefp()->varScopep(), false)),
new AstVarRef(nodep->fileline(), lastVscp, false));
} else if (nodep->edgeType()==AstEdgeType::ET_BOTHEDGE) {
AstVarScope* lastVscp = getCreateLastClk(clkvscp);
newp = new AstXor(nodep->fileline(),
new AstVarRef(nodep->fileline(),
nodep->varrefp()->varScopep(), false),
new AstVarRef(nodep->fileline(), lastVscp, false));
} else if (nodep->edgeType()==AstEdgeType::ET_HIGHEDGE) {
newp = new AstVarRef(nodep->fileline(),
clkvscp, false);
} else if (nodep->edgeType()==AstEdgeType::ET_LOWEDGE) {
newp = new AstNot(nodep->fileline(),
new AstVarRef(nodep->fileline(),
clkvscp, false));
} else {
nodep->v3fatalSrc("Bad edge type");
}
return newp;
}
