luke/verilator
1
0
Fork 0
mirror of https://github.com/verilator/verilator.git synced 2026-10-06 01:54:01 +02:00
Code Issues Packages Projects Releases Wiki Activity

Optimize consecutive repetiton and goto repetition using ring-buffer (#8096)

Browse Source
This commit is contained in:
Artur Bieniek
2026-08-25 08:26:46 -04:00
committed by GitHub
parent 538c6a6b76
commit f6d56c6440
18 changed files with 391 additions and 224 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/V3Assert.cpp
+24
View File
@@ -671,9 +671,11 @@ class AssertVisitor final : public VNVisitor {
AstNode* propExprp;
AstNodeExpr* disablep = nullptr;
AstNodeExpr* matchCountp = nullptr;
if (AstPropSpec* const specp = VN_CAST(nodep->propp(), PropSpec)) {
propExprp = specp->propp()->unlinkFrBack();
if (specp->disablep()) disablep = specp->disablep()->unlinkFrBack();
matchCountp = specp->matchCountp();
} else {
propExprp = nodep->propp()->unlinkFrBack();
}
@@ -688,6 +690,28 @@ class AssertVisitor final : public VNVisitor {
if (failsp && !VN_IS(propExprp, PExpr)) {
failsp = newIfAssertFailOn(failsp, nodep->directive(), nodep->userType());
}
if (coverp && matchCountp && passsp) {
// Convert the match count into a loop that decrements a temporary variable until it
// reaches zero.
matchCountp->unlinkFrBack();
AstVar* const remainingp = new AstVar{
flp, VVarType::BLOCKTEMP, "__VnfaRemainingMatchCount", matchCountp->dtypep()};
remainingp->lifetime(VLifetime::AUTOMATIC_EXPLICIT);
AstBegin* const replayp = new AstBegin{flp, "", remainingp, true};
replayp->addStmtsp(
new AstAssign{flp, new AstVarRef{flp, remainingp, VAccess::WRITE}, matchCountp});
AstLoop* const loopp = new AstLoop{flp};
loopp->addStmtsp(
new AstLoopTest{flp, loopp, new AstVarRef{flp, remainingp, VAccess::READ}});
loopp->addStmtsp(passsp);
loopp->addStmtsp(
new AstAssign{flp, new AstVarRef{flp, remainingp, VAccess::WRITE},
new AstSub{flp, new AstVarRef{flp, remainingp, VAccess::READ},
new AstConst{flp, AstConst::WidthedValue{},
remainingp->dtypep()->width(), 1}}});
replayp->addStmtsp(loopp);
passsp = replayp;
}
AstNode* bodysp = assertBody(nodep, propExprp, passsp, failsp);
if (disablep) bodysp = new AstIf{flp, new AstLogNot{flp, disablep}, bodysp};
// Add assertOn check last, for better combining