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Support consecutive repetition [*N:M], [+], and [*] in sequence expressions (#7379)

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This commit is contained in:
Yilou Wang
2026-04-08 10:26:03 -04:00
committed by GitHub
parent 7dcf586807
commit e63c4f563e
14 changed files with 435 additions and 53 deletions
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src/V3AssertPre.cpp
+3 -2
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@@ -707,9 +707,10 @@ private:
nodep->sentreep(newSenTree(nodep));
}
void visit(AstConsRep* nodep) override {
// IEEE 1800-2023 16.9.2 -- Lower consecutive repetition [*N]
// Saturating counter tracks consecutive true cycles; avoids O(N) $past tree.
// IEEE 1800-2023 16.9.2 -- Lower standalone exact [*N] (N >= 2) via saturating counter.
// Range/unbounded forms and SExpr-contained forms are lowered by V3AssertProp.
iterateChildren(nodep);
if (nodep->unbounded() || nodep->maxCountp()) return; // Handled by V3AssertProp
const AstConst* const constp = VN_CAST(nodep->countp(), Const);
if (VL_UNLIKELY(!constp || constp->toSInt() < 1)) {
nodep->v3fatalSrc("Consecutive repetition count must be a positive constant"