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DFG: Remove unconneced variables early

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This commit is contained in:
Geza Lore
2022-09-30 11:53:03 +01:00
parent c9d6344f2f
commit cc51966ad1
2 changed files with 30 additions and 6 deletions
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src/V3Dfg.cpp
+10 -4
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@@ -410,12 +410,18 @@ class ExtractCyclicComponents final {
static void packSources(DfgGraph& dfg) {
// Remove undriven variable sources
dfg.forEachVertex([&](DfgVertex& vtx) {
if (DfgVarPacked* const vtxp = vtx.cast<DfgVarPacked>()) {
vtxp->packSources();
if (DfgVarPacked* const varp = vtx.cast<DfgVarPacked>()) {
varp->packSources();
if (!varp->hasSinks() && varp->arity() == 0) {
VL_DO_DANGLING(varp->unlinkDelete(dfg), varp);
}
return;
}
if (DfgVarArray* const vtxp = vtx.cast<DfgVarArray>()) {
vtxp->packSources();
if (DfgVarArray* const varp = vtx.cast<DfgVarArray>()) {
varp->packSources();
if (!varp->hasSinks() && varp->arity() == 0) {
VL_DO_DANGLING(varp->unlinkDelete(dfg), varp);
}
return;
}
});