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Add some statistics to StrongPHIElimination.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125477 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich 2011-02-14 02:09:18 +00:00
parent 117be03cc6
commit 1a73cedca0
1 changed files with 8 additions and 0 deletions
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8
lib/CodeGen/StrongPHIElimination.cpp
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@ -47,6 +47,7 @@
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
@ -187,6 +188,10 @@ namespace {
};
} // namespace
STATISTIC(NumPHIsLowered, "Number of PHIs lowered");
STATISTIC(NumDestCopiesInserted, "Number of destination copies inserted");
STATISTIC(NumSrcCopiesInserted, "Number of source copies inserted");
char StrongPHIElimination::ID = 0;
INITIALIZE_PASS_BEGIN(StrongPHIElimination, "strong-phi-node-elimination",
"Eliminate PHI nodes for register allocation, intelligently", false, false)
@ -645,6 +650,7 @@ StrongPHIElimination::SplitInterferencesForBasicBlock(
void StrongPHIElimination::InsertCopiesForPHI(MachineInstr *PHI,
MachineBasicBlock *MBB) {
assert(PHI->isPHI());
++NumPHIsLowered;
unsigned PHIColor = getPHIColor(PHI);
for (unsigned i = 1; i < PHI->getNumOperands(); i += 2) {
@ -694,6 +700,7 @@ void StrongPHIElimination::InsertCopiesForPHI(MachineInstr *PHI,
TII->get(TargetOpcode::COPY),
CopyReg).addReg(SrcReg, 0, SrcSubReg);
LI->InsertMachineInstrInMaps(CopyInstr);
++NumSrcCopiesInserted;
// addLiveRangeToEndOfBlock() also adds the phikill flag to the VNInfo for
// the newly added range.
@ -763,6 +770,7 @@ void StrongPHIElimination::InsertCopiesForPHI(MachineInstr *PHI,
DestReg).addReg(CopyReg);
LI->InsertMachineInstrInMaps(CopyInstr);
PHI->getOperand(0).setReg(CopyReg);
++NumDestCopiesInserted;
// Add the region from the beginning of MBB to the copy instruction to
// CopyReg's live interval, and give the VNInfo the phidef flag.