Hidden options to help debugging ifcvt issues.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37523 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/IfConversion.cpp b/lib/CodeGen/IfConversion.cpp
index e4fd2df..5405fc8 100644
--- a/lib/CodeGen/IfConversion.cpp
+++ b/lib/CodeGen/IfConversion.cpp
@@ -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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
break;
}
Change |= RetVal;
+
+ if (IfCvtLimit != -1 && (int)NumIfConvBBs > IfCvtLimit)
+ break;
}
if (!Change)