Revert r107655.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107668 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 37 insertions, 33 deletions

diff --git a/lib/Target/MBlaze/MBlazeISelLowering.cpp b/lib/Target/MBlaze/MBlazeISelLowering.cpp
index aba4fb5..fd5cb70 100644
--- a/lib/Target/MBlaze/MBlazeISelLowering.cpp
+++ b/lib/Target/MBlaze/MBlazeISelLowering.cpp
@@ -234,24 +234,6 @@ MBlazeTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
     MachineRegisterInfo &R = F->getRegInfo();
     MachineBasicBlock *loop = F->CreateMachineBasicBlock(LLVM_BB);
     MachineBasicBlock *finish = F->CreateMachineBasicBlock(LLVM_BB);
-    F->insert(It, loop);
-    F->insert(It, finish);
-
-    // Update machine-CFG edges by transfering adding all successors and
-    // remaining instructions from the current block to the new block which
-    // will contain the Phi node for the select.
-    finish->splice(finish->begin(), BB,
-                   llvm::next(MachineBasicBlock::iterator(MI)),
-                   BB->end());
-    finish->transferSuccessorsAndUpdatePHIs(BB);
-
-    // Add the true and fallthrough blocks as its successors.
-    BB->addSuccessor(loop);
-    BB->addSuccessor(finish);
-
-    // Next, add the finish block as a successor of the loop block
-    loop->addSuccessor(finish);
-    loop->addSuccessor(loop);
 
     unsigned IAMT = R.createVirtualRegister(MBlaze::CPURegsRegisterClass);
     BuildMI(BB, dl, TII->get(MBlaze::ANDI), IAMT)
@@ -267,6 +249,26 @@ MBlazeTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
       .addReg(IAMT)
       .addMBB(finish);
 
+    F->insert(It, loop);
+    F->insert(It, finish);
+
+    // Update machine-CFG edges by first adding all successors of the current
+    // block to the new block which will contain the Phi node for the select.
+    for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
+          e = BB->succ_end(); i != e; ++i)
+      finish->addSuccessor(*i);
+
+    // Next, remove all successors of the current block, and add the true
+    // and fallthrough blocks as its successors.
+    while(!BB->succ_empty())
+      BB->removeSuccessor(BB->succ_begin());
+    BB->addSuccessor(loop);
+    BB->addSuccessor(finish);
+
+    // Next, add the finish block as a successor of the loop block
+    loop->addSuccessor(finish);
+    loop->addSuccessor(loop);
+
     unsigned DST = R.createVirtualRegister(MBlaze::CPURegsRegisterClass);
     unsigned NDST = R.createVirtualRegister(MBlaze::CPURegsRegisterClass);
     BuildMI(loop, dl, TII->get(MBlaze::PHI), DST)
@@ -296,13 +298,12 @@ MBlazeTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
       .addReg(NAMT)
       .addMBB(loop);
 
-    BuildMI(*finish, finish->begin(), dl,
-            TII->get(MBlaze::PHI), MI->getOperand(0).getReg())
+    BuildMI(finish, dl, TII->get(MBlaze::PHI), MI->getOperand(0).getReg())
       .addReg(IVAL).addMBB(BB)
       .addReg(NDST).addMBB(loop);
 
     // The pseudo instruction is no longer needed so remove it
-    MI->eraseFromParent();
+    F->DeleteMachineInstr(MI);
     return finish;
     }
 
@@ -337,23 +338,27 @@ MBlazeTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
     case MBlazeCC::LE: Opc = MBlaze::BGTID; break;
     }
 
+    BuildMI(BB, dl, TII->get(Opc))
+      .addReg(MI->getOperand(3).getReg())
+      .addMBB(dneBB);
+
     F->insert(It, flsBB);
     F->insert(It, dneBB);
 
-    // Transfer the remainder of BB and its successor edges to dneBB.
-    dneBB->splice(dneBB->begin(), BB,
-                  llvm::next(MachineBasicBlock::iterator(MI)),
-                  BB->end());
-    dneBB->transferSuccessorsAndUpdatePHIs(BB);
+    // Update machine-CFG edges by first adding all successors of the current
+    // block to the new block which will contain the Phi node for the select.
+    for(MachineBasicBlock::succ_iterator i = BB->succ_begin(),
+          e = BB->succ_end(); i != e; ++i)
+      dneBB->addSuccessor(*i);
 
+    // Next, remove all successors of the current block, and add the true
+    // and fallthrough blocks as its successors.
+    while(!BB->succ_empty())
+      BB->removeSuccessor(BB->succ_begin());
     BB->addSuccessor(flsBB);
     BB->addSuccessor(dneBB);
     flsBB->addSuccessor(dneBB);
 
-    BuildMI(BB, dl, TII->get(Opc))
-      .addReg(MI->getOperand(3).getReg())
-      .addMBB(dneBB);
-
     //  sinkMBB:
     //   %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
     //  ...
@@ -361,12 +366,11 @@ MBlazeTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
     //  .addReg(MI->getOperand(1).getReg()).addMBB(flsBB)
     //  .addReg(MI->getOperand(2).getReg()).addMBB(BB);
 
-    BuildMI(*dneBB, dneBB->begin(), dl,
-            TII->get(MBlaze::PHI), MI->getOperand(0).getReg())
+    BuildMI(dneBB, dl, TII->get(MBlaze::PHI), MI->getOperand(0).getReg())
       .addReg(MI->getOperand(2).getReg()).addMBB(flsBB)
       .addReg(MI->getOperand(1).getReg()).addMBB(BB);
 
-    MI->eraseFromParent();   // The pseudo instruction is gone now.
+    F->DeleteMachineInstr(MI);   // The pseudo instruction is gone now.
     return dneBB;
   }
   }