From c94c967656ebaf14c67ff4159c94acc30c162170 Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Thu, 15 Sep 2011 18:22:52 +0000
Subject: [PATCH] Count correctly when a COPY turns into a spill or reload.

The number of spills could go negative since a folded COPY is just a
spill, and it may be eliminated.

llvm-svn: 139815
---
 llvm/lib/CodeGen/InlineSpiller.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/CodeGen/InlineSpiller.cpp b/llvm/lib/CodeGen/InlineSpiller.cpp
index 5078f3a4bd0b..169a867aa7a5 100644
--- a/llvm/lib/CodeGen/InlineSpiller.cpp
+++ b/llvm/lib/CodeGen/InlineSpiller.cpp
@@ -1002,6 +1002,7 @@ bool InlineSpiller::coalesceStackAccess(MachineInstr *MI, unsigned Reg) {
 bool InlineSpiller::foldMemoryOperand(MachineBasicBlock::iterator MI,
                                       const SmallVectorImpl<unsigned> &Ops,
                                       MachineInstr *LoadMI) {
+  bool WasCopy = MI->isCopy();
   // TargetInstrInfo::foldMemoryOperand only expects explicit, non-tied
   // operands.
   SmallVector<unsigned, 8> FoldOps;
@@ -1031,7 +1032,12 @@ bool InlineSpiller::foldMemoryOperand(MachineBasicBlock::iterator MI,
     VRM.addSpillSlotUse(StackSlot, FoldMI);
   MI->eraseFromParent();
   DEBUG(dbgs() << "\tfolded: " << *FoldMI);
-  ++NumFolded;
+  if (!WasCopy)
+    ++NumFolded;
+  else if (Ops.front() == 0)
+    ++NumSpills;
+  else
+    ++NumReloads;
   return true;
 }