Add support for 128 bit multiplicative operations.

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

diff --git a/lib/CodeGen/RegisterScavenging.cpp b/lib/CodeGen/RegisterScavenging.cpp
index c71d3be08b4123b73fa7236dcbf141bea02f8989..ba2395a32a96d3695f48f87a94ec4cdc81abf243 100644 (file)
--- a/lib/CodeGen/RegisterScavenging.cpp
+++ b/lib/CodeGen/RegisterScavenging.cpp
@@ -37,11 +37,12 @@ static bool RedefinesSuperRegPart(const MachineInstr *MI, unsigned SubReg,
     const MachineOperand &MO = MI->getOperand(i);
     if (!MO.isRegister())
       continue;
-    if (TRI->isSuperRegister(SubReg, MO.getReg()))
+    if (TRI->isSuperRegister(SubReg, MO.getReg())) {
       if (MO.isUse())
         SeenSuperUse = true;
       else if (MO.isImplicit())
         SeenSuperDef = true;
+    }
   }
 
   return SeenSuperDef && SeenSuperUse;
@@ -55,26 +56,32 @@ static bool RedefinesSuperRegPart(const MachineInstr *MI,
 }
 
 /// setUsed - Set the register and its sub-registers as being used.
-void RegScavenger::setUsed(unsigned Reg) {
+void RegScavenger::setUsed(unsigned Reg, bool ImpDef) {
   RegsAvailable.reset(Reg);
+  ImplicitDefed[Reg] = ImpDef;
 
   for (const unsigned *SubRegs = TRI->getSubRegisters(Reg);
-       unsigned SubReg = *SubRegs; ++SubRegs)
+       unsigned SubReg = *SubRegs; ++SubRegs) {
     RegsAvailable.reset(SubReg);
+    ImplicitDefed[SubReg] = ImpDef;
+  }
 }
 
 /// setUnused - Set the register and its sub-registers as being unused.
 void RegScavenger::setUnused(unsigned Reg, const MachineInstr *MI) {
   RegsAvailable.set(Reg);
+  ImplicitDefed.reset(Reg);
 
   for (const unsigned *SubRegs = TRI->getSubRegisters(Reg);
        unsigned SubReg = *SubRegs; ++SubRegs)
-    if (!RedefinesSuperRegPart(MI, Reg, TRI))
+    if (!RedefinesSuperRegPart(MI, Reg, TRI)) {
       RegsAvailable.set(SubReg);
+      ImplicitDefed.reset(SubReg);
+    }
 }
 
 void RegScavenger::enterBasicBlock(MachineBasicBlock *mbb) {
-  const MachineFunction &MF = *mbb->getParent();
+  MachineFunction &MF = *mbb->getParent();
   const TargetMachine &TM = MF.getTarget();
   TII = TM.getInstrInfo();
   TRI = TM.getRegisterInfo();
@@ -86,6 +93,7 @@ void RegScavenger::enterBasicBlock(MachineBasicBlock *mbb) {
   if (!MBB) {
     NumPhysRegs = TRI->getNumRegs();
     RegsAvailable.resize(NumPhysRegs);
+    ImplicitDefed.resize(NumPhysRegs);
 
     // Create reserved registers bitvector.
     ReservedRegs = TRI->getReservedRegs(MF);
@@ -216,6 +224,7 @@ void RegScavenger::forward() {
   setUnused(ChangedRegs);
 
   // Process defs.
+  bool IsImpDef = MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF;
   for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
     const MachineOperand &MO = MI->getOperand(i);
 
@@ -240,12 +249,13 @@ void RegScavenger::forward() {
     if (RedefinesSuperRegPart(MI, MO, TRI))
       continue;
 
-    // Implicit def is allowed to "re-define" any register.
+    // Implicit def is allowed to "re-define" any register. Similarly,
+    // implicitly defined registers can be clobbered.
     assert((isReserved(Reg) || isUnused(Reg) ||
-            MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF ||
+            IsImpDef || isImplicitlyDefined(Reg) ||
             isLiveInButUnusedBefore(Reg, MI, MBB, TRI, MRI)) &&
            "Re-defining a live register!");
-    setUsed(Reg);
+    setUsed(Reg, IsImpDef);
   }
 }