optimize strstr, PR5783

[oota-llvm.git] / lib / CodeGen / MachineInstr.cpp

diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index e0138d34e03b422b97c1088b8876b9d23a56c985..12b974d30be9a1ebc35ab8039fca802dc601dd8c 100644 (file)
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -376,7 +376,7 @@ raw_ostream &llvm::operator<<(raw_ostream &OS, const MachineMemOperand &MMO) {
 /// MachineInstr ctor - This constructor creates a dummy MachineInstr with
 /// TID NULL and no operands.
 MachineInstr::MachineInstr()
-  : TID(0), NumImplicitOps(0), MemRefs(0), MemRefsEnd(0),
+  : TID(0), NumImplicitOps(0), AsmPrinterFlags(0), MemRefs(0), MemRefsEnd(0),
     Parent(0), debugLoc(DebugLoc::getUnknownLoc()) {
   // Make sure that we get added to a machine basicblock
   LeakDetector::addGarbageObject(this);
@@ -396,7 +396,8 @@ void MachineInstr::addImplicitDefUseOperands() {
 /// TargetInstrDesc or the numOperands if it is not zero. (for
 /// instructions with variable number of operands).
 MachineInstr::MachineInstr(const TargetInstrDesc &tid, bool NoImp)
-  : TID(&tid), NumImplicitOps(0), MemRefs(0), MemRefsEnd(0), Parent(0),
+  : TID(&tid), NumImplicitOps(0), AsmPrinterFlags(0),
+    MemRefs(0), MemRefsEnd(0), Parent(0),
     debugLoc(DebugLoc::getUnknownLoc()) {
   if (!NoImp && TID->getImplicitDefs())
     for (const unsigned *ImpDefs = TID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
@@ -414,7 +415,7 @@ MachineInstr::MachineInstr(const TargetInstrDesc &tid, bool NoImp)
 /// MachineInstr ctor - As above, but with a DebugLoc.
 MachineInstr::MachineInstr(const TargetInstrDesc &tid, const DebugLoc dl,
                            bool NoImp)
-  : TID(&tid), NumImplicitOps(0), MemRefs(0), MemRefsEnd(0),
+  : TID(&tid), NumImplicitOps(0), AsmPrinterFlags(0), MemRefs(0), MemRefsEnd(0),
     Parent(0), debugLoc(dl) {
   if (!NoImp && TID->getImplicitDefs())
     for (const unsigned *ImpDefs = TID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
@@ -434,7 +435,8 @@ MachineInstr::MachineInstr(const TargetInstrDesc &tid, const DebugLoc dl,
 /// basic block.
 ///
 MachineInstr::MachineInstr(MachineBasicBlock *MBB, const TargetInstrDesc &tid)
-  : TID(&tid), NumImplicitOps(0), MemRefs(0), MemRefsEnd(0), Parent(0), 
+  : TID(&tid), NumImplicitOps(0), AsmPrinterFlags(0),
+    MemRefs(0), MemRefsEnd(0), Parent(0), 
     debugLoc(DebugLoc::getUnknownLoc()) {
   assert(MBB && "Cannot use inserting ctor with null basic block!");
   if (TID->ImplicitDefs)
@@ -454,7 +456,7 @@ MachineInstr::MachineInstr(MachineBasicBlock *MBB, const TargetInstrDesc &tid)
 ///
 MachineInstr::MachineInstr(MachineBasicBlock *MBB, const DebugLoc dl,
                            const TargetInstrDesc &tid)
-  : TID(&tid), NumImplicitOps(0), MemRefs(0), MemRefsEnd(0),
+  : TID(&tid), NumImplicitOps(0), AsmPrinterFlags(0), MemRefs(0), MemRefsEnd(0),
     Parent(0), debugLoc(dl) {
   assert(MBB && "Cannot use inserting ctor with null basic block!");
   if (TID->ImplicitDefs)
@@ -473,7 +475,7 @@ MachineInstr::MachineInstr(MachineBasicBlock *MBB, const DebugLoc dl,
 /// MachineInstr ctor - Copies MachineInstr arg exactly
 ///
 MachineInstr::MachineInstr(MachineFunction &MF, const MachineInstr &MI)
-  : TID(&MI.getDesc()), NumImplicitOps(0),
+  : TID(&MI.getDesc()), NumImplicitOps(0), AsmPrinterFlags(0),
     MemRefs(MI.MemRefs), MemRefsEnd(MI.MemRefsEnd),
     Parent(0), debugLoc(MI.getDebugLoc()) {
   Operands.reserve(MI.getNumOperands());
@@ -1056,6 +1058,22 @@ bool MachineInstr::isInvariantLoad(AliasAnalysis *AA) const {
   return true;
 }
 
+/// isConstantValuePHI - If the specified instruction is a PHI that always
+/// merges together the same virtual register, return the register, otherwise
+/// return 0.
+unsigned MachineInstr::isConstantValuePHI() const {
+  if (getOpcode() != TargetInstrInfo::PHI)
+    return 0;
+  assert(getNumOperands() >= 3 &&
+         "It's illegal to have a PHI without source operands");
+
+  unsigned Reg = getOperand(1).getReg();
+  for (unsigned i = 3, e = getNumOperands(); i < e; i += 2)
+    if (getOperand(i).getReg() != Reg)
+      return 0;
+  return Reg;
+}
+
 void MachineInstr::dump() const {
   errs() << "  " << *this;
 }
@@ -1146,10 +1164,16 @@ void MachineInstr::print(raw_ostream &OS, const TargetMachine *TM) const {
     // TODO: print InlinedAtLoc information
 
     DebugLocTuple DLT = MF->getDebugLocTuple(debugLoc);
-    DICompileUnit CU(DLT.Scope);
-    if (!CU.isNull())
-      OS << " dbg:" << CU.getDirectory() << '/' << CU.getFilename() << ":"
-         << DLT.Line << ":" << DLT.Col;
+    DIScope Scope(DLT.Scope);
+    OS << " dbg:";
+    // Omit the directory, since it's usually long and uninteresting.
+    if (!Scope.isNull())
+      OS << Scope.getFilename();
+    else
+      OS << "<unknown>";
+    OS << ':' << DLT.Line;
+    if (DLT.Col != 0)
+      OS << ':' << DLT.Col;
   }
 
   OS << "\n";