diff --git a/lib/CodeGen/InlineSpiller.cpp b/lib/CodeGen/InlineSpiller.cpp
index b1a33a6afa4..c3663d3651d 100644
--- a/lib/CodeGen/InlineSpiller.cpp
+++ b/lib/CodeGen/InlineSpiller.cpp
@@ -16,6 +16,7 @@
#include "Spiller.h"
#include "LiveRangeEdit.h"
#include "VirtRegMap.h"
+#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/CodeGen/LiveIntervalAnalysis.h"
#include "llvm/CodeGen/LiveStackAnalysis.h"
@@ -31,6 +32,18 @@
using namespace llvm;
+STATISTIC(NumSpilledRanges, "Number of spilled live ranges");
+STATISTIC(NumSnippets, "Number of snippets included in spills");
+STATISTIC(NumSpills, "Number of spills inserted");
+STATISTIC(NumReloads, "Number of reloads inserted");
+STATISTIC(NumFolded, "Number of folded stack accesses");
+STATISTIC(NumFoldedLoads, "Number of folded loads");
+STATISTIC(NumRemats, "Number of rematerialized defs for spilling");
+STATISTIC(NumOmitReloadSpill, "Number of omitted spills after reloads");
+STATISTIC(NumHoistLocal, "Number of locally hoisted spills");
+STATISTIC(NumHoistGlobal, "Number of globally hoisted spills");
+STATISTIC(NumRedundantSpills, "Number of redundant spills identified");
+
namespace {
class InlineSpiller : public Spiller {
MachineFunctionPass &Pass;
@@ -247,10 +260,11 @@ void InlineSpiller::collectRegsToSpill() {
if (!isSnippet(SnipLI))
continue;
SnippetCopies.insert(MI);
- if (!isRegToSpill(SnipReg))
- RegsToSpill.push_back(SnipReg);
-
+ if (isRegToSpill(SnipReg))
+ continue;
+ RegsToSpill.push_back(SnipReg);
DEBUG(dbgs() << "\talso spill snippet " << SnipLI << '\n');
+ ++NumSnippets;
}
}
@@ -469,9 +483,10 @@ bool InlineSpiller::hoistSpill(LiveInterval &SpillLI, MachineInstr *CopyMI) {
<< *StackInt << '\n');
// Already spilled everywhere.
- if (SVI.AllDefsAreReloads)
+ if (SVI.AllDefsAreReloads) {
+ ++NumOmitReloadSpill;
return true;
-
+ }
// We are going to spill SVI.SpillVNI immediately after its def, so clear out
// any later spills of the same value.
eliminateRedundantSpills(SibLI, SVI.SpillVNI);
@@ -493,6 +508,11 @@ bool InlineSpiller::hoistSpill(LiveInterval &SpillLI, MachineInstr *CopyMI) {
LIS.InsertMachineInstrInMaps(MII);
VRM.addSpillSlotUse(StackSlot, MII);
DEBUG(dbgs() << "\thoisted: " << SVI.SpillVNI->def << '\t' << *MII);
+
+ if (MBB == CopyMI->getParent())
+ ++NumHoistLocal;
+ else
+ ++NumHoistGlobal;
return true;
}
@@ -547,6 +567,7 @@ void InlineSpiller::eliminateRedundantSpills(LiveInterval &SLI, VNInfo *VNI) {
// eliminateDeadDefs won't normally remove stores, so switch opcode.
MI->setDesc(TII.get(TargetOpcode::KILL));
DeadDefs.push_back(MI);
+ ++NumRedundantSpills;
}
}
} while (!WorkList.empty());
@@ -642,6 +663,7 @@ bool InlineSpiller::reMaterializeFor(LiveInterval &VirtReg,
if (RM.OrigMI->getDesc().canFoldAsLoad() &&
foldMemoryOperand(MI, Ops, RM.OrigMI)) {
Edit->markRematerialized(RM.ParentVNI);
+ ++NumFoldedLoads;
return true;
}
@@ -668,6 +690,7 @@ bool InlineSpiller::reMaterializeFor(LiveInterval &VirtReg,
VNInfo *DefVNI = NewLI.getNextValue(DefIdx, 0, LIS.getVNInfoAllocator());
NewLI.addRange(LiveRange(DefIdx, UseIdx.getDefIndex(), DefVNI));
DEBUG(dbgs() << "\tinterval: " << NewLI << '\n');
+ ++NumRemats;
return true;
}
@@ -794,6 +817,7 @@ bool InlineSpiller::foldMemoryOperand(MachineBasicBlock::iterator MI,
VRM.addSpillSlotUse(StackSlot, FoldMI);
MI->eraseFromParent();
DEBUG(dbgs() << "\tfolded: " << *FoldMI);
+ ++NumFolded;
return true;
}
@@ -811,6 +835,7 @@ void InlineSpiller::insertReload(LiveInterval &NewLI,
VNInfo *LoadVNI = NewLI.getNextValue(LoadIdx, 0,
LIS.getVNInfoAllocator());
NewLI.addRange(LiveRange(LoadIdx, Idx, LoadVNI));
+ ++NumReloads;
}
/// insertSpill - Insert a spill of NewLI.reg after MI.
@@ -825,6 +850,7 @@ void InlineSpiller::insertSpill(LiveInterval &NewLI, const LiveInterval &OldLI,
DEBUG(dbgs() << "\tspilled: " << StoreIdx << '\t' << *MI);
VNInfo *StoreVNI = NewLI.getNextValue(Idx, 0, LIS.getVNInfoAllocator());
NewLI.addRange(LiveRange(Idx, StoreIdx, StoreVNI));
+ ++NumSpills;
}
/// spillAroundUses - insert spill code around each use of Reg.
@@ -972,6 +998,7 @@ void InlineSpiller::spillAll() {
}
void InlineSpiller::spill(LiveRangeEdit &edit) {
+ ++NumSpilledRanges;
Edit = &edit;
assert(!TargetRegisterInfo::isStackSlot(edit.getReg())
&& "Trying to spill a stack slot.");
diff --git a/lib/CodeGen/LiveRangeEdit.cpp b/lib/CodeGen/LiveRangeEdit.cpp
index f8a3dbb5fd7..052abad57e1 100644
--- a/lib/CodeGen/LiveRangeEdit.cpp
+++ b/lib/CodeGen/LiveRangeEdit.cpp
@@ -15,6 +15,7 @@
#include "LiveRangeEdit.h"
#include "VirtRegMap.h"
#include "llvm/ADT/SetVector.h"
+#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/CalcSpillWeights.h"
#include "llvm/CodeGen/LiveIntervalAnalysis.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
@@ -24,6 +25,10 @@
using namespace llvm;
+STATISTIC(NumDCEDeleted, "Number of instructions deleted by DCE");
+STATISTIC(NumDCEFoldedLoads, "Number of single use loads folded after DCE");
+STATISTIC(NumFracRanges, "Number of live ranges fractured by DCE");
+
LiveInterval &LiveRangeEdit::createFrom(unsigned OldReg,
LiveIntervals &LIS,
VirtRegMap &VRM) {
@@ -199,6 +204,7 @@ bool LiveRangeEdit::foldAsLoad(LiveInterval *LI,
UseMI->eraseFromParent();
DefMI->addRegisterDead(LI->reg, 0);
Dead.push_back(DefMI);
+ ++NumDCEFoldedLoads;
return true;
}
@@ -269,6 +275,7 @@ void LiveRangeEdit::eliminateDeadDefs(SmallVectorImpl<MachineInstr*> &Dead,
delegate_->LRE_WillEraseInstruction(MI);
LIS.RemoveMachineInstrFromMaps(MI);
MI->eraseFromParent();
+ ++NumDCEDeleted;
}
if (ToShrink.empty())
@@ -290,6 +297,7 @@ void LiveRangeEdit::eliminateDeadDefs(SmallVectorImpl<MachineInstr*> &Dead,
unsigned NumComp = ConEQ.Classify(LI);
if (NumComp <= 1)
continue;
+ ++NumFracRanges;
DEBUG(dbgs() << NumComp << " components: " << *LI << '\n');
SmallVector<LiveInterval*, 8> Dups(1, LI);
for (unsigned i = 1; i != NumComp; ++i) {
diff --git a/lib/CodeGen/SplitKit.cpp b/lib/CodeGen/SplitKit.cpp
index feb3d3481b4..739ba362745 100644
--- a/lib/CodeGen/SplitKit.cpp
+++ b/lib/CodeGen/SplitKit.cpp
@@ -30,6 +30,8 @@ using namespace llvm;
STATISTIC(NumFinished, "Number of splits finished");
STATISTIC(NumSimple, "Number of splits that were simple");
+STATISTIC(NumCopies, "Number of copies inserted for splitting");
+STATISTIC(NumRemats, "Number of rematerialized defs for splitting");
//===----------------------------------------------------------------------===//
// Split Analysis
@@ -589,12 +591,14 @@ VNInfo *SplitEditor::defFromParent(unsigned RegIdx,
LiveRangeEdit::Remat RM(ParentVNI);
if (Edit->canRematerializeAt(RM, UseIdx, true, LIS)) {
Def = Edit->rematerializeAt(MBB, I, LI->reg, RM, LIS, TII, TRI, Late);
+ ++NumRemats;
} else {
// Can't remat, just insert a copy from parent.
CopyMI = BuildMI(MBB, I, DebugLoc(), TII.get(TargetOpcode::COPY), LI->reg)
.addReg(Edit->getReg());
Def = LIS.getSlotIndexes()->insertMachineInstrInMaps(CopyMI, Late)
.getDefIndex();
+ ++NumCopies;
}
// Define the value in Reg.