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Fix $countbits in assert with non-tristates (#5566).

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Wilson Snyder
2024-10-27 09:30:54 -04:00
parent 469eca7de2
commit 2f272a4190
4 changed files with 59 additions and 2 deletions
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src/V3Tristate.cpp
+2 -2
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@@ -1433,7 +1433,6 @@ class TristateVisitor final : public TristateBaseVisitor {
dropop[1] = VN_IS(nodep->thsp(), Const) && VN_AS(nodep->thsp(), Const)->num().isAnyZ();
dropop[2] = VN_IS(nodep->fhsp(), Const) && VN_AS(nodep->fhsp(), Const)->num().isAnyZ();
UINFO(4, " COUNTBITS(" << dropop[0] << dropop[1] << dropop[2] << " " << nodep << endl);
const AstVarRef* const varrefp = VN_AS(nodep->lhsp(), VarRef); // Input variable
if (m_graphing) {
iterateAndNextNull(nodep->lhsp());
if (!dropop[0]) iterateAndNextNull(nodep->rhsp());
@@ -1454,7 +1453,8 @@ class TristateVisitor final : public TristateBaseVisitor {
// do so at present, we only compare if there is a z in the equation. Otherwise
// we'd need to attach an enable to every signal, then optimize them away later
// when we determine the signal has no tristate
if (!VN_IS(nodep->lhsp(), VarRef)) {
const AstVarRef* const varrefp = VN_CAST(nodep->lhsp(), VarRef); // Input variable
if (!varrefp) {
nodep->v3warn(E_UNSUPPORTED, "Unsupported LHS tristate construct: "
<< nodep->prettyTypeName());
return;