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Fix isolate_assignments when many signals per always.

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git-svn-id: file://localhost/svn/verilator/trunk/verilator@877 77ca24e4-aefa-0310-84f0-b9a241c72d87
This commit is contained in:
Wilson Snyder
2007-01-23 18:11:26 +00:00
parent 7f515e6033
commit 3ff10b40d6
4 changed files with 20 additions and 6 deletions
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src/V3SplitAs.cpp
+13 -2
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@@ -20,7 +20,7 @@
//*************************************************************************
// V3SplitAs's Transformations:
//
// Search each ALWAYS for a VARREF lvalue with a /*isolate_asignments*/ attribute
// Search each ALWAYS for a VARREF lvalue with a /*isolate_assignments*/ attribute
// If found, color statements with both, assignment to that varref, or other assignments.
// Replicate the Always, and remove mis-colored duplicate code.
//
@@ -166,12 +166,23 @@ private:
virtual void visit(AstAlways* nodep, AstNUser*) {
// Are there any lvalue references below this?
// There could be more then one. So, we process the first one found first.
if (!nodep->user()) {
AstVarScope* lastSplitVscp = NULL;
while (!nodep->user()) {
// Find any splittable variables
SplitAsFindVisitor visitor (nodep);
m_splitVscp = visitor.splitVscp();
if (m_splitVscp && m_splitVscp == lastSplitVscp) {
// We did this last time! Something's stuck!
nodep->v3fatalSrc("Infinite loop in isolate_assignments removal for: "<<m_splitVscp->prettyName())
m_splitVscp = NULL;
}
lastSplitVscp = m_splitVscp;
// Now isolate the always
if (m_splitVscp) {
splitAlways(nodep);
m_statSplits++;
} else {
nodep->user(true);
}
}
}