Disable emission of aranges by default and add a command line

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

diff --git a/lib/CodeGen/RegisterScavenging.cpp b/lib/CodeGen/RegisterScavenging.cpp
index f82ccbe84da3222a00aedcff116e79333dbb2e13..75ebdaa357f789754ba6a96999b4f103c26644eb 100644 (file)
--- a/lib/CodeGen/RegisterScavenging.cpp
+++ b/lib/CodeGen/RegisterScavenging.cpp
@@ -31,9 +31,8 @@ using namespace llvm;
 
 /// setUsed - Set the register and its sub-registers as being used.
 void RegScavenger::setUsed(unsigned Reg) {
-  RegsAvailable.reset(Reg);
-
-  for (MCSubRegIterator SubRegs(Reg, TRI); SubRegs.isValid(); ++SubRegs)
+  for (MCSubRegIterator SubRegs(Reg, TRI, /*IncludeSelf=*/true);
+       SubRegs.isValid(); ++SubRegs)
     RegsAvailable.reset(*SubRegs);
 }
 
@@ -45,8 +44,8 @@ bool RegScavenger::isAliasUsed(unsigned Reg) const {
 }
 
 void RegScavenger::initRegState() {
-  for (SmallVector<ScavengedInfo, 2>::iterator I = Scavenged.begin(),
-       IE = Scavenged.end(); I != IE; ++I) {
+  for (SmallVectorImpl<ScavengedInfo>::iterator I = Scavenged.begin(),
+         IE = Scavenged.end(); I != IE; ++I) {
     I->Reg = 0;
     I->Restore = NULL;
   }
@@ -105,8 +104,8 @@ void RegScavenger::enterBasicBlock(MachineBasicBlock *mbb) {
 }
 
 void RegScavenger::addRegWithSubRegs(BitVector &BV, unsigned Reg) {
-  BV.set(Reg);
-  for (MCSubRegIterator SubRegs(Reg, TRI); SubRegs.isValid(); ++SubRegs)
+  for (MCSubRegIterator SubRegs(Reg, TRI, /*IncludeSelf=*/true);
+       SubRegs.isValid(); ++SubRegs)
     BV.set(*SubRegs);
 }
 
@@ -182,8 +181,8 @@ void RegScavenger::forward() {
 
   MachineInstr *MI = MBBI;
 
-  for (SmallVector<ScavengedInfo, 2>::iterator I = Scavenged.begin(),
-       IE = Scavenged.end(); I != IE; ++I) {
+  for (SmallVectorImpl<ScavengedInfo>::iterator I = Scavenged.begin(),
+         IE = Scavenged.end(); I != IE; ++I) {
     if (I->Restore != MI)
       continue;
 
@@ -369,7 +368,7 @@ unsigned RegScavenger::scavengeRegister(const TargetRegisterClass *RC,
   // Exclude all the registers being used by the instruction.
   for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {
     MachineOperand &MO = I->getOperand(i);
-    if (MO.isReg() && MO.getReg() != 0 &&
+    if (MO.isReg() && MO.getReg() != 0 && !(MO.isUse() && MO.isUndef()) &&
         !TargetRegisterInfo::isVirtualRegister(MO.getReg()))
       Candidates.reset(MO.getReg());
   }