Revert "LiveRegUnits: Add accumulateBackward() function"

This seems to be breaking some bots.

This reverts commit r292543.

llvm-svn: 292574

1 files changed, 0 insertions, 24 deletions

diff --git a/llvm/lib/CodeGen/LiveRegUnits.cpp b/llvm/lib/CodeGen/LiveRegUnits.cpp
index 0a10b4e6265..14da799a63f 100644
--- a/llvm/lib/CodeGen/LiveRegUnits.cpp
+++ b/llvm/lib/CodeGen/LiveRegUnits.cpp
@@ -26,15 +26,6 @@ void LiveRegUnits::removeRegsNotPreserved(const uint32_t *RegMask) {
   }
 }
 
-void LiveRegUnits::addRegsInMask(const uint32_t *RegMask) {
-  for (unsigned U = 0, E = TRI->getNumRegUnits(); U != E; ++U) {
-    for (MCRegUnitRootIterator RootReg(U, TRI); RootReg.isValid(); ++RootReg) {
-      if (MachineOperand::clobbersPhysReg(RegMask, *RootReg))
-        Units.set(U);
-    }
-  }
-}
-
 void LiveRegUnits::stepBackward(const MachineInstr &MI) {
   // Remove defined registers and regmask kills from the set.
   for (ConstMIBundleOperands O(MI); O.isValid(); ++O) {
@@ -60,21 +51,6 @@ void LiveRegUnits::stepBackward(const MachineInstr &MI) {
   }
 }
 
-void LiveRegUnits::accumulateBackward(const MachineInstr &MI) {
-  // Add defs, uses and regmask clobbers to the set.
-  for (ConstMIBundleOperands O(MI); O.isValid(); ++O) {
-    if (O->isReg()) {
-      unsigned Reg = O->getReg();
-      if (!TargetRegisterInfo::isPhysicalRegister(Reg))
-        continue;
-      if (!O->isDef() && !O->readsReg())
-        continue;
-      addReg(Reg);
-    } else if (O->isRegMask())
-      addRegsInMask(O->getRegMask());
-  }
-}
-
 /// Add live-in registers of basic block \p MBB to \p LiveUnits.
 static void addLiveIns(LiveRegUnits &LiveUnits, const MachineBasicBlock &MBB) {
   for (const auto &LI : MBB.liveins())