Revert "[AMDGPU] Fix DPP combiner"

This reverts commit e3e2923a39cbec3b3bc3a7d3f0e9a77a4115080e, svn revision rL350721

llvm-svn: 350730

1 files changed, 0 insertions, 26 deletions

diff --git a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
index 36bb13b5f53..b7c4eed6211 100644
--- a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
@@ -5591,29 +5591,3 @@ MachineInstr *llvm::getVRegSubRegDef(const TargetInstrInfo::RegSubRegPair &P,
   }
   return nullptr;
 }
-
-bool llvm::isEXECMaskConstantBetweenDefAndUses(unsigned VReg,
-                                               MachineRegisterInfo &MRI) {
-  assert(MRI.isSSA() && "Must be run on SSA");
-  auto *TRI = MRI.getTargetRegisterInfo();
-
-  auto *DefI = MRI.getVRegDef(VReg);
-  auto *BB = DefI->getParent();
-
-  DenseSet<MachineInstr*> Uses;
-  for (auto &Use : MRI.use_nodbg_operands(VReg)) {
-    auto *I = Use.getParent();
-    if (I->getParent() != BB)
-      return false;
-    Uses.insert(I);
-  }
-
-  auto E = BB->end();
-  for (auto I = std::next(DefI->getIterator()); I != E; ++I) {
-    Uses.erase(&*I);
-    // don't check the last use
-    if (Uses.empty() || I->modifiesRegister(AMDGPU::EXEC, TRI))
-      break;
-  }
-  return Uses.empty();
-}