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Clock gating optimization, currently disabled. Merge from branch

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This commit is contained in:
Wilson Snyder
2009-01-07 09:37:59 -05:00
parent 12bd12e112
commit 59159b4811
19 changed files with 1451 additions and 132 deletions
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src/V3Active.cpp
+43 -25
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@@ -43,6 +43,7 @@
#include "V3Active.h"
#include "V3Ast.h"
#include "V3EmitCBase.h"
#include "V3Const.h"
//***** See below for main transformation engine
@@ -77,8 +78,8 @@ private:
// Don't clear scopep, the namer persists beyond this visit
}
virtual void visit(AstSenTree* nodep, AstNUser*) {
// Sort sensitivity list
nodep->sortSenses();
// Simplify sensitivity list
V3Const::constifyTreeExpensive(nodep);
}
// Empty visitors, speed things up
virtual void visit(AstNodeStmt* nodep, AstNUser*) { }
@@ -185,10 +186,15 @@ public:
class ActiveVisitor : public ActiveBaseVisitor {
private:
// NODE STATE
// Each call to V3Const::constify
// AstNode::user4() Used by V3Const::constify, called below
// STATE
ActiveNamer m_namer; // Tracking of active names
AstCFunc* m_scopeFinalp; // Final function for this scope
AstAlways* m_alwaysp; // Under always
bool m_itemCombo; // Found a SenItem combo
bool m_itemSequent; // Found a SenItem sequential
// VISITORS
virtual void visit(AstScope* nodep, AstNUser*) {
@@ -252,6 +258,7 @@ private:
nodep->deleteTree(); nodep = NULL;
}
// METHODS
virtual void visit(AstAlways* nodep, AstNUser*) {
// Move always to appropriate ACTIVE based on its sense list
UINFO(4," ALW "<<nodep<<endl);
@@ -273,29 +280,14 @@ private:
}
// Read sensitivitues
bool combo = false;
bool sequent = false;
if (nodep->sensesp()) {
for (AstNodeSenItem* nextp, *senp = nodep->sensesp()->sensesp(); senp; senp=nextp) {
nextp = senp->nextp()->castNodeSenItem();
if (AstSenItem* itemp = senp->castSenItem()) {
if (itemp->edgeType() == AstEdgeType::ANYEDGE) {
combo = true;
// Delete the sensitivity
// We'll add it as a generic COMBO SenItem in a moment.
itemp->unlinkFrBack()->deleteTree(); itemp=NULL; senp=NULL;
} else if (itemp->varrefp()) {
// V3LinkResolve should have cleaned most of these up
if (itemp->varrefp()->width()>1) itemp->v3error("Unsupported: Non-single bit wide signal pos/negedge sensitivity: "
<<itemp->varrefp()->prettyName());
sequent = true;
itemp->varrefp()->varp()->usedClock(true);
}
} else {
senp->v3fatalSrc("Strange node under sentree");
}
}
}
m_alwaysp = nodep;
m_itemCombo = false;
m_itemSequent = false;
nodep->sensesp()->iterateAndNext(*this);
m_alwaysp = NULL;
bool combo = m_itemCombo;
bool sequent = m_itemSequent;
if (!combo && !sequent) combo=true; // If no list, Verilog 2000: always @ (*)
#ifndef NEW_ORDERING
if (combo && sequent) {
@@ -334,6 +326,29 @@ private:
ActiveDlyVisitor dlyvisitor (nodep);
}
}
virtual void visit(AstSenGate* nodep, AstNUser*) {
AstSenItem* subitemp = nodep->sensesp();
if (subitemp->edgeType() != AstEdgeType::ANYEDGE
&& subitemp->edgeType() != AstEdgeType::POSEDGE
&& subitemp->edgeType() != AstEdgeType::NEGEDGE) {
nodep->v3fatalSrc("Strange activity type under SenGate");
}
nodep->iterateChildren(*this);
}
virtual void visit(AstSenItem* nodep, AstNUser*) {
if (nodep->edgeType() == AstEdgeType::ANYEDGE) {
m_itemCombo = true;
// Delete the sensitivity
// We'll add it as a generic COMBO SenItem in a moment.
nodep->unlinkFrBack()->deleteTree(); nodep=NULL;
} else if (nodep->varrefp()) {
// V3LinkResolve should have cleaned most of these up
if (nodep->varrefp()->width()>1) nodep->v3error("Unsupported: Non-single bit wide signal pos/negedge sensitivity: "
<<nodep->varrefp()->prettyName());
m_itemSequent = true;
nodep->varrefp()->varp()->usedClock(true);
}
}
// Empty visitors, speed things up
virtual void visit(AstNodeMath* nodep, AstNUser*) {}
@@ -346,6 +361,9 @@ public:
// CONSTUCTORS
ActiveVisitor(AstNode* nodep) {
m_scopeFinalp = NULL;
m_alwaysp = NULL;
m_itemCombo = false;
m_itemSequent = false;
nodep->accept(*this);
}
virtual ~ActiveVisitor() {}