Enable reg chart dump for > 128 GRFs

This PR enables reg chart dump for large GRF config. It now prints only
as many GRFs as are available in current VRT config.

It also skips printing busy/free for label as that can be misleading,
especially for entry label.

Author: pratikashar

visa/RADebug.cpp

@@ -1052,7 +1052,8 @@ bool Interference::dumpIntf(const char *s) const {
 // use temp allocations from lrs. Doesnt handle sub-routines yet.
 void RegChartDump::dumpRegChart(std::ostream &os, const LiveRangeVec &lrs,
                                 unsigned numLRs) {
-  constexpr unsigned N = 128;
+  constexpr unsigned N = 1024;
+  vISA_ASSERT(N >= gra.kernel.getNumRegTotal(), "more GRFs than N");
   std::unordered_map<G4_INST *, std::bitset<N>> busyGRFPerInst;
   bool dumpHex = false;
 
@@ -1091,7 +1092,15 @@ void RegChartDump::dumpRegChart(std::ostream &os, const LiveRangeVec &lrs,
     auto startInst = startEnd[dcl].first;
     auto endInst = startEnd[dcl].second;
 
-    bool start = (dcl->getRegFile() == G4_RegFileKind::G4_INPUT);
+    bool start = false;
+    if (gra.kernel.fg.getIsStackCallFunc()) {
+      start = (dcl->getRegFile() & G4_RegFileKind::G4_INPUT);
+    } else {
+      // Pre-defined %arg dcl uses G4_INPUT RegFileKind but it isn't live-in
+      // to a kernel. So make an exception.
+      if (!gra.kernel.fg.builder->isPreDefArg(dcl))
+        start = (dcl->getRegFile() & G4_RegFileKind::G4_INPUT);
+    }
     bool done = false;
     for (auto bb : gra.kernel.fg) {
       for (auto inst : *bb) {
@@ -1127,6 +1136,11 @@ void RegChartDump::dumpRegChart(std::ostream &os, const LiveRangeVec &lrs,
       inst->emit(ss);
       auto len = ss.str().length();
 
+      if (inst->isLabel()) {
+        os << ss.str() << "\n";
+        continue;
+      }
+
       if (len <= maxInstLen) {
         os << ss.str();
         for (unsigned i = 0; i != maxInstLen - ss.str().length(); i++)
@@ -1141,7 +1155,7 @@ void RegChartDump::dumpRegChart(std::ostream &os, const LiveRangeVec &lrs,
 
       if (!dumpHex) {
         // dump GRFs | - busy, * - free
-        for (unsigned i = 0; i != N; i++) {
+        for (unsigned i = 0; i != gra.kernel.getNumRegTotal(); i++) {
           // emit in groups of 10 GRFs
           if (i > 0 && (i % 10) == 0)
             os << "  ";