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Merge branch 'parallaxsw:master' into master

This commit is contained in:
Akash Levy 2024-07-31 20:49:00 -07:00 committed by GitHub
parent 504ccb97eb ad83b05e5b
commit 84847676b7
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GPG Key ID: B5690EEEBB952194
2 changed files with 29 additions and 10 deletions
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3
include/sta/Liberty.hh
View File

@ -556,7 +556,10 @@ protected:
const LibertyPort *en,
const RiseFall *en_rf,
const LibertyPort *q,
const TimingArcSet *en_to_q,
Report *report);
bool condMatch(const TimingArcSet *arc_set1,
const TimingArcSet *arc_set2);
void findDefaultCondArcs();
void translatePresetClrCheckRoles();
void inferLatchRoles(Report *report,

36
liberty/Liberty.cc
View File

@ -1729,11 +1729,13 @@ LibertyCell::makeLatchEnables(Report *report,
LibertyPort *en = en_to_q->from();
LibertyPort *q = en_to_q->to();
for (TimingArcSet *d_to_q : timingArcSets(nullptr, q)) {
if (d_to_q->role() == TimingRole::latchDtoQ()) {
if (d_to_q->role() == TimingRole::latchDtoQ()
&& condMatch(en_to_q, d_to_q)) {
LibertyPort *d = d_to_q->from();
const RiseFall *en_rf = en_to_q->isRisingFallingEdge();
if (en_rf) {
TimingArcSet *setup_check = findLatchSetup(d, en, en_rf, q, report);
TimingArcSet *setup_check = findLatchSetup(d, en, en_rf, q, d_to_q,
report);
LatchEnable *latch_enable = makeLatchEnable(d, en, en_rf, q, d_to_q,
en_to_q,
setup_check,
@ -1766,11 +1768,22 @@ LibertyCell::makeLatchEnables(Report *report,
}
}
bool
LibertyCell::condMatch(const TimingArcSet *arc_set1,
const TimingArcSet *arc_set2)
{
FuncExpr *cond1 = arc_set1->cond();
FuncExpr *cond2 = arc_set2->cond();
return (cond1 == nullptr && cond2 == nullptr)
|| FuncExpr::equiv(cond1, cond2);
}
TimingArcSet *
LibertyCell::findLatchSetup(const LibertyPort *d,
const LibertyPort *en,
const RiseFall *en_rf,
const LibertyPort *q,
const TimingArcSet *en_to_q,
Report *report)
{
TimingArcSetSeq en_d_arcs = timingArcSets(en, d);
@ -1779,7 +1792,8 @@ LibertyCell::findLatchSetup(const LibertyPort *d,
if (arc_set->role() == TimingRole::setup()) {
for (TimingArc *arc : arc_set->arcs()) {
const RiseFall *from_rf = arc->fromEdge()->asRiseFall();
if (from_rf == en_rf->opposite())
if (from_rf == en_rf->opposite()
&& condMatch(arc_set, en_to_q))
return arc_set;
}
}
@ -1875,16 +1889,18 @@ LibertyCell::inferLatchRoles(Report *report,
for (TimingArcSet *d_to_q : timingArcSets(nullptr, q)) {
// Look for combinational d->q arcs.
TimingRole *d_to_q_role = d_to_q->role();
if ((d_to_q_role == TimingRole::combinational()
&& d_to_q->arcCount() == 2
&& (d_to_q->sense() == TimingSense::positive_unate
|| d_to_q->sense() == TimingSense::negative_unate))
// Previously identified as D->Q arc.
|| d_to_q_role == TimingRole::latchDtoQ()) {
if (((d_to_q_role == TimingRole::combinational()
&& d_to_q->arcCount() == 2
&& (d_to_q->sense() == TimingSense::positive_unate
|| d_to_q->sense() == TimingSense::negative_unate))
// Previously identified as D->Q arc.
|| d_to_q_role == TimingRole::latchDtoQ())
&& condMatch(en_to_q, d_to_q)) {
LibertyPort *d = d_to_q->from();
const RiseFall *en_rf = en_to_q->isRisingFallingEdge();
if (en_rf) {
TimingArcSet *setup_check = findLatchSetup(d, en, en_rf, q, report);
TimingArcSet *setup_check = findLatchSetup(d, en, en_rf, q, en_to_q,
report);
makeLatchEnable(d, en, en_rf, q, d_to_q, en_to_q, setup_check, debug);
d_to_q->setRole(TimingRole::latchDtoQ());
en_to_q->setRole(TimingRole::latchEnToQ());