RegisterPressure: Add PressureDiff::dump()

Also display the pressure diff in the case of a
getMaxUpwardPressureDelta() verify failure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241759 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/CodeGen/RegisterPressure.h b/include/llvm/CodeGen/RegisterPressure.h
index fcb6feed68ca2c45d47051ce5f107f021e6839b5..9d8843d1d74a54c5c021c6a0b5fc1ceda29c4f0d 100644 (file)
--- a/include/llvm/CodeGen/RegisterPressure.h
+++ b/include/llvm/CodeGen/RegisterPressure.h
@@ -135,6 +135,8 @@ public:
 
   void addPressureChange(unsigned RegUnit, bool IsDec,
                          const MachineRegisterInfo *MRI);
+
+  LLVM_DUMP_METHOD void dump(const TargetRegisterInfo &TRI) const;
 };
 
 /// Array of PressureDiffs.

diff --git a/lib/CodeGen/RegisterPressure.cpp b/lib/CodeGen/RegisterPressure.cpp
index 450a3051c6ffb2499bb38629c860fef41e082bee..c3786e552a13031923a74a690ddb7f3cf17576e2 100644 (file)
--- a/lib/CodeGen/RegisterPressure.cpp
+++ b/lib/CodeGen/RegisterPressure.cpp
@@ -77,6 +77,16 @@ void RegPressureTracker::dump() const {
   P.dump(TRI);
 }
 
+void PressureDiff::dump(const TargetRegisterInfo &TRI) const {
+  for (const PressureChange &Change : *this) {
+    if (!Change.isValid() || Change.getUnitInc() == 0)
+      continue;
+    dbgs() << "    " << TRI.getRegPressureSetName(Change.getPSet())
+           << " " << Change.getUnitInc();
+  }
+  dbgs() << '\n';
+}
+
 /// Increase the current pressure as impacted by these registers and bump
 /// the high water mark if needed.
 void RegPressureTracker::increaseRegPressure(ArrayRef<unsigned> RegUnits) {
@@ -787,6 +797,8 @@ getMaxUpwardPressureDelta(const MachineInstr *MI, PressureDiff *PDiff,
   RegPressureDelta Delta2;
   getUpwardPressureDelta(MI, *PDiff, Delta2, CriticalPSets, MaxPressureLimit);
   if (Delta != Delta2) {
+    dbgs() << "PDiff: ";
+    PDiff->dump(*TRI);
     dbgs() << "DELTA: " << *MI;
     if (Delta.Excess.isValid())
       dbgs() << "Excess1 " << TRI->getRegPressureSetName(Delta.Excess.getPSet())