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Internals: Eliminate user5 for smaller AstNode/better runtime

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This commit is contained in:
Wilson Snyder
2008-11-25 07:57:02 -05:00
parent 314c9de845
commit 30ad20be52
6 changed files with 53 additions and 52 deletions
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src/V3Delayed.cpp
+12 -13
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@@ -75,19 +75,18 @@ private:
// AstVarScope::userp() -> AstVarScope*. Points to temp var created.
// AstVarScope::user2p() -> AstActive*. Points to activity block of signal
// AstVarScope::user4p() -> AstAlwaysPost*. Post block for this variable
// AstVar::user() -> VarUsage. Tracks delayed vs non-delayed usage
// AstVar::user2() -> bool. Set true if already made warning
// AstVar::user3() -> VarUsage. Tracks delayed vs non-delayed usage
// AstVar::user4() -> int. Vector number, for assignment creation
// AstVarRef::user2() -> bool. Set true if already processed
// AstAlwaysPost::user4() -> AstIf*. Last IF (__Vdlyvset__) created under this AlwaysPost
// Cleared each scope:
// AstAssignDly::user5() -> AstVarScope*. __Vdlyvset__ created for this assign
// AstAlwaysPost::user5() -> AstVarScope*. __Vdlyvset__ last referenced in IF
// AstAssignDly::user3() -> AstVarScope*. __Vdlyvset__ created for this assign
// AstAlwaysPost::user3() -> AstVarScope*. __Vdlyvset__ last referenced in IF
AstUserInUse m_inuse1;
AstUser2InUse m_inuse2;
AstUser3InUse m_inuse3;
AstUser4InUse m_inuse4;
AstUser5InUse m_inuse5;
enum VarUsage { VU_NONE=0, VU_DLY=1, VU_NONDLY=2 };
@@ -107,8 +106,8 @@ private:
// METHODS
void markVarUsage(AstVar* nodep, uint32_t flags) {
//UINFO(4," MVU "<<flags<<" "<<nodep<<endl);
nodep->user3( nodep->user3() | flags );
if ((nodep->user3() & VU_DLY) && (nodep->user3() & VU_NONDLY)) {
nodep->user( nodep->user() | flags );
if ((nodep->user() & VU_DLY) && (nodep->user() & VU_NONDLY)) {
nodep->v3warn(BLKANDNBLK,"Unsupported: Blocked and non-blocking assignments to same variable: "<<nodep->prettyName());
}
}
@@ -227,13 +226,13 @@ private:
bool sharedVset = false;
AstVarScope* setvscp;
if (nodep->user5p()) {
if (nodep->user3p()) {
// Simplistic optimization. If the previous statement in same scope was also a =>,
// then we told this nodep->user5 we can use its Vdlyvset rather than making a new one.
// then we told this nodep->user3 we can use its Vdlyvset rather than making a new one.
// This is good for code like:
// for (i=0; i<5; i++) vector[i] <= something;
sharedVset = true;
setvscp = nodep->user5p()->castNode()->castVarScope();
setvscp = nodep->user3p()->castNode()->castVarScope();
m_statSharedSet++;
} else { // Create new one
string setvarname = (string("__Vdlyvset__")+oldvarp->shortName()+"__v"+cvtToStr(modVecNum));
@@ -251,7 +250,7 @@ private:
nodep->addNextHere(setassignp);
}
if (m_nextDlyp) { // Tell next assigndly it can share the variable
m_nextDlyp->user5p(setvscp);
m_nextDlyp->user3p(setvscp);
}
//
// Create ALWAYSPOST for delayed variable
@@ -278,7 +277,7 @@ private:
varrefp->varScopep()->user4p(finalp);
}
AstIf* postLogicp;
if (finalp->user5p()->castNode() == setvscp) {
if (finalp->user3p()->castNode() == setvscp) {
// Optimize as above; if sharing Vdlyvset *ON SAME VARIABLE*,
// we can share the IF statement too
postLogicp = finalp->user4p()->castNode()->castIf();
@@ -290,7 +289,7 @@ private:
NULL);
UINFO(9," Created "<<postLogicp<<endl);
finalp->addBodysp(postLogicp);
finalp->user5p(setvscp); // Remember IF's vset variable
finalp->user3p(setvscp); // Remember IF's vset variable
finalp->user4p(postLogicp); // and the associated IF, as we may be able to reuse it
}
postLogicp->addIfsp(new AstAssign(nodep->fileline(), selectsp, valreadp));
@@ -306,7 +305,7 @@ private:
}
virtual void visit(AstScope* nodep, AstNUser*) {
UINFO(4," MOD "<<nodep<<endl);
AstNode::user5ClearTree();
AstNode::user3ClearTree();
nodep->iterateChildren(*this);
}
virtual void visit(AstCFunc* nodep, AstNUser*) {