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Add split_var metacomment to assist UNOPTFLAT fixes, #2066.

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This commit is contained in:
Wilson Snyder
2020-02-28 19:15:08 -05:00
parent c6b755a12e
commit 4878fe3a1f
22 changed files with 4058 additions and 22 deletions
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src/V3Order.cpp
+29 -12
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@@ -91,6 +91,7 @@
#include "V3Partition.h"
#include "V3PartitionGraph.h"
#include "V3SenTree.h"
#include "V3SplitVar.h"
#include "V3Stats.h"
#include "V3Order.h"
@@ -892,32 +893,48 @@ private:
m_graph.userClearVertices();
// May be very large vector, so only report the "most important"
// elements. Up to 10 of the widest
std::cerr<<V3Error::msgPrefix()
<<" Widest candidate vars to split:"<<endl;
std::cerr << V3Error::warnMore() << "... Widest candidate vars to split:" << endl;
std::stable_sort(m_unoptflatVars.begin(), m_unoptflatVars.end(), OrderVarWidthCmp());
vl_unordered_set<const AstVar*> canSplitList;
int lim = m_unoptflatVars.size() < 10 ? m_unoptflatVars.size() : 10;
for (int i = 0; i < lim; i++) {
OrderVarStdVertex* vsvertexp = m_unoptflatVars[i];
AstVar* varp = vsvertexp->varScp()->varp();
std::cerr<<V3Error::msgPrefix()<<" "
<<varp->fileline()<<" "<<varp->prettyName()<<std::dec
<<", width "<<varp->width()<<", fanout "
<<vsvertexp->fanout()<<endl;
const bool canSplit = V3SplitVar::canSplitVar(varp);
std::cerr << V3Error::warnMore() << " " << varp->fileline() << " "
<< varp->prettyName() << std::dec << ", width " << varp->width()
<< ", fanout " << vsvertexp->fanout();
if (canSplit) {
std::cerr <<", can split_var";
canSplitList.insert(varp);
}
std::cerr << std::endl;
}
// Up to 10 of the most fanned out
std::cerr<<V3Error::msgPrefix()
<<" Most fanned out candidate vars to split:"<<endl;
std::cerr << V3Error::warnMore()
<< "... Most fanned out candidate vars to split:" << endl;
std::stable_sort(m_unoptflatVars.begin(), m_unoptflatVars.end(),
OrderVarFanoutCmp());
lim = m_unoptflatVars.size() < 10 ? m_unoptflatVars.size() : 10;
for (int i = 0; i < lim; i++) {
OrderVarStdVertex* vsvertexp = m_unoptflatVars[i];
AstVar* varp = vsvertexp->varScp()->varp();
std::cerr<<V3Error::msgPrefix()<<" "
<<varp->fileline()<<" "<<varp->prettyName()
<<", width "<<std::dec<<varp->width()
<<", fanout "<<vsvertexp->fanout()<<endl;
const bool canSplit = V3SplitVar::canSplitVar(varp);
std::cerr << V3Error::warnMore() << " " << varp->fileline() << " "
<< varp->prettyName() << ", width " << std::dec << varp->width()
<< ", fanout " << vsvertexp->fanout();
if (canSplit) {
std::cerr << ", can split_var";
canSplitList.insert(varp);
}
std::cerr<<endl;
}
if (!canSplitList.empty()) {
std::cerr << V3Error::warnMore()
<< "... Suggest add /*verilator split_var*/ to appropriate variables above."
<< std::endl;
}
V3Stats::addStat("Order, SplitVar, candidates", canSplitList.size());
m_unoptflatVars.clear();
}