Fix PR3934 part 2. findOnlyInterestingUse() was not setting IsCopy and IsDstPhys which are returned by value and used by callee. This happened to work on the earlier test cases because of a logic error in the caller side.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69006 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 9 deletions

diff --git a/lib/CodeGen/TwoAddressInstructionPass.cpp b/lib/CodeGen/TwoAddressInstructionPass.cpp
index 8a18dc0fc7..42d517b2e5 100644
--- a/lib/CodeGen/TwoAddressInstructionPass.cpp
+++ b/lib/CodeGen/TwoAddressInstructionPass.cpp
@@ -405,7 +405,7 @@ static
 MachineInstr *findOnlyInterestingUse(unsigned Reg, MachineBasicBlock *MBB,
                                      MachineRegisterInfo *MRI,
                                      const TargetInstrInfo *TII,
-                                     bool &isCopy,
+                                     bool &IsCopy,
                                      unsigned &DstReg, bool &IsDstPhys) {
   MachineRegisterInfo::use_iterator UI = MRI->use_begin(Reg);
   if (UI == MRI->use_end())
@@ -418,11 +418,15 @@ MachineInstr *findOnlyInterestingUse(unsigned Reg, MachineBasicBlock *MBB,
     return 0;
   unsigned SrcReg;
   bool IsSrcPhys;
-  if (isCopyToReg(UseMI, TII, SrcReg, DstReg, IsSrcPhys, IsDstPhys))
+  if (isCopyToReg(UseMI, TII, SrcReg, DstReg, IsSrcPhys, IsDstPhys)) {
+    IsCopy = true;
     return &UseMI;
+  }
   IsDstPhys = false;
-  if (isTwoAddrUse(UseMI, Reg, DstReg))
+  if (isTwoAddrUse(UseMI, Reg, DstReg)) {
+    IsDstPhys = TargetRegisterInfo::isPhysicalRegister(DstReg);
     return &UseMI;
+  }
   return 0;
 }
 
@@ -634,12 +638,12 @@ void TwoAddressInstructionPass::ProcessCopy(MachineInstr *MI,
              "Can't map to two src physical registers!");
 
     SmallVector<unsigned, 4> VirtRegPairs;
-    bool isCopy = false;
+    bool IsCopy = false;
     unsigned NewReg = 0;
     while (MachineInstr *UseMI = findOnlyInterestingUse(DstReg, MBB, MRI,TII,
-                                                   isCopy, NewReg, IsDstPhys)) {
-      if (isCopy) {
-        if (Processed.insert(UseMI))
+                                                   IsCopy, NewReg, IsDstPhys)) {
+      if (IsCopy) {
+        if (!Processed.insert(UseMI))
           break;
       }
 
@@ -654,8 +658,8 @@ void TwoAddressInstructionPass::ProcessCopy(MachineInstr *MI,
       }
       bool isNew = SrcRegMap.insert(std::make_pair(NewReg, DstReg)).second;
       if (!isNew)
-      assert(SrcRegMap[NewReg] == DstReg &&
-             "Can't map to two src physical registers!");
+        assert(SrcRegMap[NewReg] == DstReg &&
+               "Can't map to two src physical registers!");
       VirtRegPairs.push_back(NewReg);
       DstReg = NewReg;
     }