[llvm-commits] [llvm] r133646 - /llvm/trunk/lib/CodeGen/TailDuplication.cpp

[Chad Rosier]

Author: mcrosier
Date: Wed Jun 22 16:13:23 2011
New Revision: 133646

URL: http://llvm.org/viewvc/llvm-project?rev=133646&view=rev
Log:
Revert r133607.  This is causing failures in the Clang gccTestSuite.
Specifically, gcc.c-torture/compile/pr21356.c.

Modified:
    llvm/trunk/lib/CodeGen/TailDuplication.cpp

Modified: llvm/trunk/lib/CodeGen/TailDuplication.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/TailDuplication.cpp?rev=133646&r1=133645&r2=133646&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/TailDuplication.cpp (original)
+++ llvm/trunk/lib/CodeGen/TailDuplication.cpp Wed Jun 22 16:13:23 2011
@@ -568,9 +568,9 @@
 TailDuplicatePass::isSimpleBB(MachineBasicBlock *TailBB) {
   if (TailBB->succ_size() != 1)
     return false;
-  MachineBasicBlock::iterator I = TailBB->begin();
+  MachineBasicBlock::iterator I = TailBB->getFirstNonPHI();
   MachineBasicBlock::iterator E = TailBB->end();
-  while (I != E && I->isDebugValue())
+  while (I->isDebugValue() && I != E)
     ++I;
   if (I == E)
     return true;
@@ -712,7 +712,7 @@
   DenseSet<unsigned> UsedByPhi;
   getRegsUsedByPHIs(*TailBB, &UsedByPhi);
 
-  if (isSimpleBB(TailBB))
+  if (0 && isSimpleBB(TailBB))
     return duplicateSimpleBB(TailBB, TDBBs, UsedByPhi, Copies);
 
   // Iterate through all the unique predecessors and tail-duplicate this