Add debug output.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127959 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/InlineSpiller.cpp b/lib/CodeGen/InlineSpiller.cpp
index ab9054c77ff93a25551fc1f7a77e5714a91712d1..7f7c15ea0148b7226f2c98a864e13a187b7439ff 100644 (file)
--- a/lib/CodeGen/InlineSpiller.cpp
+++ b/lib/CodeGen/InlineSpiller.cpp
@@ -435,6 +435,8 @@ bool InlineSpiller::hoistSpill(LiveInterval &SpillLI, MachineInstr *CopyMI) {
   LiveInterval &OrigLI = LIS.getInterval(Original);
   VNInfo *OrigVNI = OrigLI.getVNInfoAt(Idx);
   StackInt.MergeValueInAsValue(OrigLI, OrigVNI, StackInt.getValNumInfo(0));
+  DEBUG(dbgs() << "\tmerged orig valno " << OrigVNI->id << ": "
+               << StackInt << '\n');
 
   // Already spilled everywhere.
   if (SVI.AllDefsAreReloads)
@@ -480,6 +482,7 @@ void InlineSpiller::eliminateRedundantSpills(unsigned Reg, VNInfo *VNI) {
     // Add all of VNI's live range to StackInt.
     LiveInterval &LI = LIS.getInterval(Reg);
     StackInt.MergeValueInAsValue(LI, VNI, StackInt.getValNumInfo(0));
+    DEBUG(dbgs() << "Merged to stack int: " << StackInt << '\n');
 
     // Find all spills and copies of VNI.
     for (MachineRegisterInfo::use_nodbg_iterator UI = MRI.use_nodbg_begin(Reg);
@@ -874,6 +877,7 @@ void InlineSpiller::spill(LiveRangeEdit &edit) {
   for (unsigned i = 0, e = RegsToSpill.size(); i != e; ++i)
     stacklvr.MergeRangesInAsValue(LIS.getInterval(RegsToSpill[i]),
                                   stacklvr.getValNumInfo(0));
+  DEBUG(dbgs() << "Merged spilled regs: " << stacklvr << '\n');
 
   // Spill around uses of all RegsToSpill.
   for (unsigned i = 0, e = RegsToSpill.size(); i != e; ++i)

diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp
index 6feae4790d0a5ee5741579416b026b9399cee4d0..c1d8272dc509cbed54af80a40ceed9cfeaf0f702 100644 (file)
--- a/lib/CodeGen/RegAllocGreedy.cpp
+++ b/lib/CodeGen/RegAllocGreedy.cpp
@@ -1265,6 +1265,7 @@ unsigned RAGreedy::selectOrSplit(LiveInterval &VirtReg,
   // Wait until the second time, when all smaller ranges have been allocated.
   // This gives a better picture of the interference to split around.
   if (Stage == RS_Original) {
+    DEBUG(dbgs() << "wait for second round\n");
     NewVRegs.push_back(&VirtReg);
     return 0;
   }