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Internals: Do not optimize variables with RW refs in Dfg

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This commit is contained in:
Geza Lore
2026-03-27 07:50:05 +00:00
parent f12cdac8da
commit 9ed7a9f98b
4 changed files with 60 additions and 38 deletions
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src/V3DfgSynthesize.cpp
+3 -1
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@@ -145,6 +145,7 @@ class AstToDfgConverter final : public VNVisitor {
// Returns {nullptr, 0}, if the given LValue expression is not supported.
std::pair<DfgVertexSplice*, uint32_t> convertLValue(AstNodeExpr* nodep) {
if (const AstVarRef* const vrefp = VN_CAST(nodep, VarRef)) {
UASSERT_OBJ(vrefp->access().isWriteOnly(), vrefp, "Non-WriteOnly reference");
if (!isSupported(vrefp)) {
++m_ctx.m_conv.nonRepLValue;
return {nullptr, 0};
@@ -366,7 +367,8 @@ class AstToDfgConverter final : public VNVisitor {
UASSERT_OBJ(!nodep->user2p(), nodep, "Already has Dfg vertex");
if (unhandled(nodep)) return;
// This visit method is only called on RValues, where only read refs are supported
if (!nodep->access().isReadOnly() || !isSupported(nodep)) {
UASSERT_OBJ(nodep->access().isReadOnly(), nodep, "Non-ReadOnly reference");
if (!isSupported(nodep)) {
m_foundUnhandled = true;
++m_ctx.m_conv.nonRepVarRef;
return;