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Hidden options to help debugging ifcvt issues. 

llvm-svn: 37523
This commit is contained in:
Evan Cheng 2007-06-08 19:10:51 +00:00
parent 082c6ae383
commit e93ccc013f
1 changed files with 32 additions and 2 deletions
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34
llvm/lib/CodeGen/IfConversion.cpp
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@ -19,11 +19,27 @@
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/Statistic.h"
using namespace llvm;
namespace {
// Hidden options for help debugging.
cl::opt<int> IfCvtFnStart("ifcvt-fn-start", cl::init(-1), cl::Hidden);
cl::opt<int> IfCvtFnStop("ifcvt-fn-stop", cl::init(-1), cl::Hidden);
cl::opt<int> IfCvtLimit("ifcvt-limit", cl::init(-1), cl::Hidden);
cl::opt<bool> DisableSimple("disable-ifcvt-simple",
cl::init(false), cl::Hidden);
cl::opt<bool> DisableSimpleFalse("disable-ifcvt-simple-false",
cl::init(false), cl::Hidden);
cl::opt<bool> DisableTriangle("disable-ifcvt-triangle",
cl::init(false), cl::Hidden);
cl::opt<bool> DisableDiamond("disable-ifcvt-diamond",
cl::init(false), cl::Hidden);
}
STATISTIC(NumSimple, "Number of simple if-conversions performed");
STATISTIC(NumSimpleRev, "Number of simple (reversed) if-conversions performed");
STATISTIC(NumTriangle, "Number of triangle if-conversions performed");
@ -139,7 +155,15 @@ bool IfConverter::runOnMachineFunction(MachineFunction &MF) {
TII = MF.getTarget().getInstrInfo();
if (!TII) return false;
DOUT << "\nIfcvt: function \'" << MF.getFunction()->getName() << "\'\n";
static int FnNum = -1;
DOUT << "\nIfcvt: function (" << ++FnNum << ") \'"
<< MF.getFunction()->getName() << "\'";
if (FnNum < IfCvtFnStart || (IfCvtFnStop != -1 && FnNum > IfCvtFnStop)) {
DOUT << " skipped\n";
return false;
}
DOUT << "\n";
MF.RenumberBlocks();
BBAnalysis.resize(MF.getNumBlockIDs());
@ -151,7 +175,7 @@ bool IfConverter::runOnMachineFunction(MachineFunction &MF) {
std::vector<BBInfo*> Candidates;
MadeChange = false;
while (true) {
while (IfCvtLimit == -1 || (int)NumIfConvBBs < IfCvtLimit) {
// Do an intial analysis for each basic block and finding all the potential
// candidates to perform if-convesion.
bool Change = AnalyzeBlocks(MF, Candidates);
@ -171,6 +195,7 @@ bool IfConverter::runOnMachineFunction(MachineFunction &MF) {
case ICSimple:
case ICSimpleFalse: {
bool isRev = BBI.Kind == ICSimpleFalse;
if ((isRev && DisableSimpleFalse) || (!isRev && DisableSimple)) break;
DOUT << "Ifcvt (Simple" << (BBI.Kind == ICSimpleFalse ? " false" : "")
<< "): BB#" << BBI.BB->getNumber() << " ("
<< ((BBI.Kind == ICSimpleFalse)
@ -183,6 +208,7 @@ bool IfConverter::runOnMachineFunction(MachineFunction &MF) {
break;
}
case ICTriangle:
if (DisableTriangle) break;
DOUT << "Ifcvt (Triangle): BB#" << BBI.BB->getNumber() << " (T:"
<< BBI.TrueBB->getNumber() << ",F:" << BBI.FalseBB->getNumber()
<< ") ";
@ -191,6 +217,7 @@ bool IfConverter::runOnMachineFunction(MachineFunction &MF) {
if (RetVal) NumTriangle++;
break;
case ICDiamond:
if (DisableDiamond) break;
DOUT << "Ifcvt (Diamond): BB#" << BBI.BB->getNumber() << " (T:"
<< BBI.TrueBB->getNumber() << ",F:" << BBI.FalseBB->getNumber();
if (BBI.TailBB)
@ -202,6 +229,9 @@ bool IfConverter::runOnMachineFunction(MachineFunction &MF) {
break;
}
Change |= RetVal;
if (IfCvtLimit != -1 && (int)NumIfConvBBs > IfCvtLimit)
break;
}
if (!Change)