R600: Remove predicated_break inst

We were using two instructions for similar purpose : break and
predicated break. Only predicated_break was emitted and it was
lowered at R600ControlFlowFinalizer to JUMP;CF_BREAK;POP.
This commit simplify the situation by making AMDILCFGStructurizer
emit IF_PREDICATE;BREAK;ENDIF; instead of predicated_break (which
is now removed).

There is no functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187510 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 32 deletions

diff --git a/lib/Target/R600/AMDILCFGStructurizer.cpp b/lib/Target/R600/AMDILCFGStructurizer.cpp
index fac56f0..687eadb 100644
--- a/lib/Target/R600/AMDILCFGStructurizer.cpp
+++ b/lib/Target/R600/AMDILCFGStructurizer.cpp
@@ -251,7 +251,6 @@ protected:
   MachineInstr *getLoopendBlockBranchInstr(MachineBasicBlock *MBB);
   static MachineInstr *getReturnInstr(MachineBasicBlock *MBB);
   static MachineInstr *getContinueInstr(MachineBasicBlock *MBB);
-  static MachineInstr *getLoopBreakInstr(MachineBasicBlock *MBB);
   static bool isReturnBlock(MachineBasicBlock *MBB);
   static void cloneSuccessorList(MachineBasicBlock *DstMBB,
       MachineBasicBlock *SrcMBB) ;
@@ -668,16 +667,6 @@ MachineInstr *AMDGPUCFGStructurizer::getContinueInstr(MachineBasicBlock *MBB) {
   return NULL;
 }
 
-MachineInstr *AMDGPUCFGStructurizer::getLoopBreakInstr(MachineBasicBlock *MBB) {
-  for (MachineBasicBlock::iterator It = MBB->begin(); (It != MBB->end());
-      ++It) {
-    MachineInstr *MI = &(*It);
-    if (MI->getOpcode() == AMDGPU::PREDICATED_BREAK)
-      return MI;
-  }
-  return NULL;
-}
-
 bool AMDGPUCFGStructurizer::isReturnBlock(MachineBasicBlock *MBB) {
   MachineInstr *MI = getReturnInstr(MBB);
   bool IsReturn = (MBB->succ_size() == 0);
@@ -1529,26 +1518,8 @@ void AMDGPUCFGStructurizer::mergeLooplandBlock(MachineBasicBlock *DstBlk,
   DEBUG(dbgs() << "loopPattern header = BB" << DstBlk->getNumber()
                << " land = BB" << LandMBB->getNumber() << "\n";);
 
-  /* we last inserterd the DebugLoc in the
-   * BREAK_LOGICALZ_i32 or AMDGPU::BREAK_LOGICALNZ statement in the current
-   * dstBlk.
-   * search for the DebugLoc in the that statement.
-   * if not found, we have to insert the empty/default DebugLoc */
-  MachineInstr *LoopBreakInstr = getLoopBreakInstr(DstBlk);
-  DebugLoc DLBreak = (LoopBreakInstr) ? LoopBreakInstr->getDebugLoc() :
-      DebugLoc();
-
-  insertInstrBefore(DstBlk, AMDGPU::WHILELOOP, DLBreak);
-
-  /* we last inserterd the DebugLoc in the continue statement in the current
-   * dstBlk.
-   * search for the DebugLoc in the continue statement.
-   * if not found, we have to insert the empty/default DebugLoc */
-  MachineInstr *ContinueInstr = getContinueInstr(DstBlk);
-  DebugLoc DLContinue = (ContinueInstr) ? ContinueInstr->getDebugLoc() :
-      DebugLoc();
-
-  insertInstrEnd(DstBlk, AMDGPU::ENDLOOP, DLContinue);
+  insertInstrBefore(DstBlk, AMDGPU::WHILELOOP, DebugLoc());
+  insertInstrEnd(DstBlk, AMDGPU::ENDLOOP, DebugLoc());
   DstBlk->addSuccessor(LandMBB);
   DstBlk->removeSuccessor(DstBlk);
 }
@@ -1565,7 +1536,9 @@ void AMDGPUCFGStructurizer::mergeLoopbreakBlock(MachineBasicBlock *ExitingMBB,
   MachineBasicBlock::iterator I = BranchMI;
   if (TrueBranch != LandMBB)
     reversePredicateSetter(I);
-  insertCondBranchBefore(I, AMDGPU::PREDICATED_BREAK, DL);
+  insertCondBranchBefore(ExitingMBB, I, AMDGPU::IF_PREDICATE_SET, AMDGPU::PREDICATE_BIT, DL);
+  insertInstrBefore(I, AMDGPU::BREAK);
+  insertInstrBefore(I, AMDGPU::ENDIF);
   //now branchInst can be erase safely
   BranchMI->eraseFromParent();
   //now take care of successors, retire blocks