Revert r123419. It still breaks llvm-gcc-i386-linux-selfhost.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123423 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 8 deletions

diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp
index b940e26911..923fa213e7 100644
--- a/lib/CodeGen/PHIElimination.cpp
+++ b/lib/CodeGen/PHIElimination.cpp
@@ -339,8 +339,6 @@ void PHIElimination::LowerAtomicPHINode(
 #ifndef NDEBUG
         for (MachineBasicBlock::iterator TI = llvm::next(Term);
              TI != opBlock.end(); ++TI) {
-          if (TI->isDebugValue())
-            continue;
           assert(!TI->readsRegister(SrcReg) &&
                  "Terminator instructions cannot use virtual registers unless"
                  "they are the first terminator in a block!");
@@ -349,13 +347,9 @@ void PHIElimination::LowerAtomicPHINode(
       } else if (reusedIncoming || !IncomingReg) {
         // We may have to rewind a bit if we didn't insert a copy this time.
         KillInst = Term;
-        while (KillInst != opBlock.begin()) {
-          --KillInst;
-          if (KillInst->isDebugValue())
-            continue;
-          if (KillInst->readsRegister(SrcReg))
+        while (KillInst != opBlock.begin())
+          if ((--KillInst)->readsRegister(SrcReg))
             break;
-        }
       } else {
         // We just inserted this copy.
         KillInst = prior(InsertPos);