X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FScoreboardHazardRecognizer.cpp;h=004c685bf39a2a238cde445bf2c075000e029866;hb=150cef218fc3a25046c0f35761806e5a056cd430;hp=ac62d7ef0d47eb3703f2c29ec62f140df8a23b47;hpb=d327d3ddddaf23fe920a01bf6304f6a8f4986e89;p=oota-llvm.git

diff --git a/lib/CodeGen/ScoreboardHazardRecognizer.cpp b/lib/CodeGen/ScoreboardHazardRecognizer.cpp
index ac62d7ef0d4..004c685bf39 100644
--- a/lib/CodeGen/ScoreboardHazardRecognizer.cpp
+++ b/lib/CodeGen/ScoreboardHazardRecognizer.cpp
@@ -13,7 +13,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE ::llvm::ScoreboardHazardRecognizer::DebugType
 #include "llvm/CodeGen/ScoreboardHazardRecognizer.h"
 #include "llvm/CodeGen/ScheduleDAG.h"
 #include "llvm/MC/MCInstrItineraries.h"
@@ -24,6 +23,8 @@
 
 using namespace llvm;
 
+#define DEBUG_TYPE ::llvm::ScoreboardHazardRecognizer::DebugType
+
 #ifndef NDEBUG
 const char *ScoreboardHazardRecognizer::DebugType = "";
 #endif
@@ -44,8 +45,6 @@ ScoreboardHazardRecognizer(const InstrItineraryData *II,
   // avoid dealing with the boundary condition.
   unsigned ScoreboardDepth = 1;
   if (ItinData && !ItinData->isEmpty()) {
-    IssueWidth = ItinData->IssueWidth;
-
     for (unsigned idx = 0; ; ++idx) {
       if (ItinData->isEndMarker(idx))
         break;
@@ -74,11 +73,15 @@ ScoreboardHazardRecognizer(const InstrItineraryData *II,
   ReservedScoreboard.reset(ScoreboardDepth);
   RequiredScoreboard.reset(ScoreboardDepth);
 
-  if (!MaxLookAhead)
+  // If MaxLookAhead is not set above, then we are not enabled.
+  if (!isEnabled())
     DEBUG(dbgs() << "Disabled scoreboard hazard recognizer\n");
-  else
+  else {
+    // A nonempty itinerary must have a SchedModel.
+    IssueWidth = ItinData->SchedModel->IssueWidth;
     DEBUG(dbgs() << "Using scoreboard hazard recognizer: Depth = "
           << ScoreboardDepth << '\n');
+  }
 }
 
 void ScoreboardHazardRecognizer::Reset() {
@@ -87,6 +90,7 @@ void ScoreboardHazardRecognizer::Reset() {
   ReservedScoreboard.reset();
 }
 
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
 void ScoreboardHazardRecognizer::Scoreboard::dump() const {
   dbgs() << "Scoreboard:\n";
 
@@ -102,6 +106,7 @@ void ScoreboardHazardRecognizer::Scoreboard::dump() const {
     dbgs() << '\n';
   }
 }
+#endif
 
 bool ScoreboardHazardRecognizer::atIssueLimit() const {
   if (IssueWidth == 0)
@@ -122,7 +127,7 @@ ScoreboardHazardRecognizer::getHazardType(SUnit *SU, int Stalls) {
   // free FU's in the scoreboard at the appropriate future cycles.
 
   const MCInstrDesc *MCID = DAG->getInstrDesc(SU);
-  if (MCID == NULL) {
+  if (!MCID) {
     // Don't check hazards for non-machineinstr Nodes.
     return NoHazard;
   }