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Support SVA goto repetition with range [->M:N] (#7569)

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This commit is contained in:
Yilou Wang
2026-05-11 07:07:51 -04:00
committed by GitHub
parent 485c0e746c
commit b0d58bbcef
17 changed files with 397 additions and 68 deletions
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src/V3AssertPre.cpp
+15
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@@ -1082,6 +1082,19 @@ private:
return new AstPExpr{flp, beginp, exprp->findBitDType()};
}
// Reject [=M:N] nonconsecutive range that reached V3AssertPre.
// [->M:N] is fully handled upstream (NFA path); only [=M:N] still lands
// here because AstSNonConsRep lowering is not yet implemented there.
// Replaces the node with BitFalse so lowering continues after the warning.
bool rejectNonconsecRange(AstNode* nodep, AstNodeExpr* maxCountp) {
if (!maxCountp) return false;
nodep->v3warn(E_UNSUPPORTED, "Unsupported: [=M:N] nonconsecutive range repetition"
" (IEEE 1800-2023 16.9.2)");
nodep->replaceWith(new AstConst{nodep->fileline(), AstConst::BitFalse{}});
VL_DO_DANGLING(pushDeletep(nodep), nodep);
return true;
}
void visit(AstSGotoRep* nodep) override {
// Standalone goto rep (not inside implication antecedent)
iterateChildren(nodep);
@@ -1097,6 +1110,7 @@ private:
void visit(AstSNonConsRep* nodep) override {
// Standalone nonconsecutive rep (not inside implication antecedent)
iterateChildren(nodep);
if (rejectNonconsecRange(nodep, nodep->maxCountp())) return;
FileLine* const flp = nodep->fileline();
AstNodeExpr* countp = nodep->countp()->unlinkFrBack();
if (!validateRepCount(nodep, countp)) return;
@@ -1154,6 +1168,7 @@ private:
if (AstSNonConsRep* const ncrp = VN_CAST(nodep->lhsp(), SNonConsRep)) {
iterateChildren(ncrp);
iterateAndNextNull(nodep->rhsp());
if (rejectNonconsecRange(nodep, ncrp->maxCountp())) return;
FileLine* const flp = nodep->fileline();
AstNodeExpr* countp = ncrp->countp()->unlinkFrBack();
if (!validateRepCount(nodep, countp)) return;