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Support always / always[m:n] / s_always[m:n] property operators (#7482)

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This commit is contained in:
Yilou Wang
2026-04-27 08:20:34 -04:00
committed by GitHub
parent e4803f29b6
commit c8893b64de
21 changed files with 435 additions and 84 deletions
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src/V3AssertNfa.cpp
+27
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@@ -528,6 +528,30 @@ class SvaNfaBuilder final {
return {currentp, nullptr, {}};
}
// always[lo:hi] / s_always[lo:hi] (IEEE 1800-2023 16.12.11).
BuildResult buildPropAlways(AstPropAlways* nodep, SvaStateVertex* entryVtxp,
bool isTopLevelStep = false) {
FileLine* const flp = nodep->fileline();
AstNodeExpr* const propp = nodep->propp();
const int lo = getConstInt(nodep->loBoundp());
const int hi = getConstInt(nodep->hiBoundp());
UASSERT_OBJ(lo >= 0 && hi >= lo, nodep, "PropAlways bounds invariant (V3Width)");
SvaStateVertex* currentp = addDelayChain(entryVtxp, lo, flp);
for (int k = 0; k <= hi - lo; ++k) {
if (k > 0) {
SvaStateVertex* const nextp = scopedCreateVertex();
guardedEdge(currentp, nextp, flp);
currentp = nextp;
}
SvaStateVertex* const checkp = scopedCreateVertex();
SvaTransEdge* const linkp
= guardedLink(currentp, checkp, sampled(propp->cloneTreePure(false)), flp);
if (isTopLevelStep && !m_inUnboundedScope) linkp->m_rejectOnFail = true;
currentp = checkp;
}
return {currentp, nullptr, {}};
}
BuildResult buildGotoRep(AstSGotoRep* repp, SvaStateVertex* entryVtxp) {
FileLine* const flp = repp->fileline();
AstNodeExpr* const exprp = repp->exprp();
@@ -734,6 +758,9 @@ public:
if (AstSConsRep* const repp = VN_CAST(nodep, SConsRep)) {
return buildConsRep(repp, entryVtxp, isTopLevelStep);
}
if (AstPropAlways* const alwaysp = VN_CAST(nodep, PropAlways)) {
return buildPropAlways(alwaysp, entryVtxp, isTopLevelStep);
}
if (AstSGotoRep* const repp = VN_CAST(nodep, SGotoRep)) {
return buildGotoRep(repp, entryVtxp);
}