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Dfg: Fix crash on additional driver from non-DFG logic

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Ensure variables written by non-DFG code are kept

Fixes #3740
This commit is contained in:
Geza Lore
2022-11-12 11:55:49 +00:00
parent 6736e92cdb
commit dbcaad99c5
6 changed files with 55 additions and 9 deletions
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src/V3DfgOptimizer.cpp
+5 -2
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@@ -244,9 +244,12 @@ void V3DfgOptimizer::optimize(AstNetlist* netlistp, const string& label) {
UINFO(2, __FUNCTION__ << ": " << endl);
// NODE STATE
// AstVar::user1 -> Used by V3DfgPasses::astToDfg
// AstVar::user2 -> bool: Flag indicating referenced by AstVarXRef
// AstVar::user1 -> Used by V3DfgPasses::astToDfg and DfgPassed::dfgToAst
// AstVar::user2 -> bool: Flag indicating referenced by AstVarXRef (set just below)
// AstVar::user3 -> bool: Flag indicating written by logic not representable as DFG
// (set by V3DfgPasses::astToDfg)
const VNUser2InUse user2InUse;
const VNUser3InUse user3InUse;
// Mark cross-referenced variables
netlistp->foreach([](const AstVarXRef* xrefp) { xrefp->varp()->user2(true); });