X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FDeadMachineInstructionElim.cpp;h=4832a5ee9ae0488f37cd2e08c297f8742ae2bf61;hb=f9410141f703f4e8a6aba717617ef958249f6d13;hp=718b6e2a5aac0aae11649f47669a96d8f6ae2443;hpb=723ac3720f6d983e0ed01504964fde1aa63951ff;p=oota-llvm.git

diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp
index 718b6e2a5aa..4832a5ee9ae 100644
--- a/lib/CodeGen/DeadMachineInstructionElim.cpp
+++ b/lib/CodeGen/DeadMachineInstructionElim.cpp
@@ -58,7 +58,7 @@ bool DeadMachineInstructionElim::isDead(MachineInstr *MI) const {
   // Examine each operand.
   for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
     const MachineOperand &MO = MI->getOperand(i);
-    if (MO.isRegister() && MO.isDef()) {
+    if (MO.isReg() && MO.isDef()) {
       unsigned Reg = MO.getReg();
       if (TargetRegisterInfo::isPhysicalRegister(Reg) ?
           LivePhysRegs[Reg] : !MRI->use_empty(Reg)) {
@@ -122,13 +122,16 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) {
       // Record the physreg defs.
       for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
         const MachineOperand &MO = MI->getOperand(i);
-        if (MO.isRegister() && MO.isDef()) {
+        if (MO.isReg() && MO.isDef()) {
           unsigned Reg = MO.getReg();
           if (Reg != 0 && TargetRegisterInfo::isPhysicalRegister(Reg)) {
             LivePhysRegs.reset(Reg);
-            for (const unsigned *AliasSet = TRI->getAliasSet(Reg);
-                 *AliasSet; ++AliasSet)
-              LivePhysRegs.reset(*AliasSet);
+            // Check the subreg set, not the alias set, because a def
+            // of a super-register may still be partially live after
+            // this def.
+            for (const unsigned *SubRegs = TRI->getSubRegisters(Reg);
+                 *SubRegs; ++SubRegs)
+              LivePhysRegs.reset(*SubRegs);
           }
         }
       }
@@ -136,7 +139,7 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) {
       // both defined and used in the same instruction.
       for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
         const MachineOperand &MO = MI->getOperand(i);
-        if (MO.isRegister() && MO.isUse()) {
+        if (MO.isReg() && MO.isUse()) {
           unsigned Reg = MO.getReg();
           if (Reg != 0 && TargetRegisterInfo::isPhysicalRegister(Reg)) {
             LivePhysRegs.set(Reg);