luke/verilator
1
0
Fork 0
mirror of https://github.com/verilator/verilator.git synced 2026-09-04 00:30:34 +02:00
Code Issues Packages Projects Releases Wiki Activity

Fix NFA range ring outgoing bit selection (#8061 repair) (#8092)

Browse Source 
Signed-off-by: Artur Bieniek <[email protected]>
This commit is contained in:
Artur Bieniek
2026-08-12 12:28:32 -04:00
committed by GitHub
parent e962efca12
commit 73bcf5e0db
4 changed files with 20 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/V3AssertNfa.cpp
+4 -12
View File
@@ -1811,26 +1811,18 @@ class SvaNfaLowering final {
VAccess::WRITE),
incomingp};
AstNode* updateBodyp = writeIncomingp;
if (!vtxp->m_isFixedDelayRing) {
// ring[next_idx] <= 1'b0;
AstAssignDly* const clearExpirep = new AstAssignDly{
c.flp,
delayRingBit(c.flp, ringp, nextRingIndex(c.flp, idxp, size), VAccess::WRITE),
new AstConst{c.flp, AstConst::BitFalse{}}};
clearExpirep->addNext(writeIncomingp);
updateBodyp = clearExpirep;
}
// live_count <= live_count + incoming_bit - outgoing_bit;
const int liveCountWidth = liveCountVarp->dtypep()->width();
AstNodeExpr* const incomingIncrementp
= new AstExtend{c.flp, incomingp->cloneTreePure(false), liveCountWidth};
AstNodeExpr* const outgoingIdxp = vtxp->m_isFixedDelayRing
? new AstVarRef{c.flp, idxp, VAccess::READ}
: nextRingIndex(c.flp, idxp, size);
AstSub* const nextLiveCountp = new AstSub{
c.flp,
new AstAdd{c.flp, new AstVarRef{c.flp, liveCountVarp, VAccess::READ},
incomingIncrementp},
new AstExtend{
c.flp, delayRingBit(c.flp, ringp, new AstVarRef{c.flp, idxp, VAccess::READ}),
liveCountWidth}};
new AstExtend{c.flp, delayRingBit(c.flp, ringp, outgoingIdxp), liveCountWidth}};
updateBodyp->addNext(new AstAssignDly{
c.flp, new AstVarRef{c.flp, liveCountVarp, VAccess::WRITE}, nextLiveCountp});