Temporarily revert r242871

PR24299

llvm-svn: 243522

1 files changed, 15 insertions, 28 deletions

diff --git a/llvm/lib/CodeGen/BranchFolding.cpp b/llvm/lib/CodeGen/BranchFolding.cpp
index 608f021b035..618266731c0 100644
--- a/llvm/lib/CodeGen/BranchFolding.cpp
+++ b/llvm/lib/CodeGen/BranchFolding.cpp
@@ -12,8 +12,7 @@
 // it then removes.
 //
 // Note that this pass must be run after register allocation, it cannot handle
-// SSA form. It also must handle virtual registers for targets that emit virtual
-// ISA (e.g. NVPTX).
+// SSA form.
 //
 //===----------------------------------------------------------------------===//
 
@@ -1574,17 +1573,6 @@ static MachineBasicBlock *findFalseBlock(MachineBasicBlock *BB,
   return nullptr;
 }
 
-template <class Container>
-static void addRegAndItsAliases(unsigned Reg, const TargetRegisterInfo *TRI,
-                                Container &Set) {
-  if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
-    for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI)
-      Set.insert(*AI);
-  } else {
-    Set.insert(Reg);
-  }
-}
-
 /// findHoistingInsertPosAndDeps - Find the location to move common instructions
 /// in successors to. The location is usually just before the terminator,
 /// however if the terminator is a conditional branch and its previous
@@ -1610,7 +1598,8 @@ MachineBasicBlock::iterator findHoistingInsertPosAndDeps(MachineBasicBlock *MBB,
     if (!Reg)
       continue;
     if (MO.isUse()) {
-      addRegAndItsAliases(Reg, TRI, Uses);
+      for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI)
+        Uses.insert(*AI);
     } else {
       if (!MO.isDead())
         // Don't try to hoist code in the rare case the terminator defines a
@@ -1619,7 +1608,8 @@ MachineBasicBlock::iterator findHoistingInsertPosAndDeps(MachineBasicBlock *MBB,
 
       // If the terminator defines a register, make sure we don't hoist
       // the instruction whose def might be clobbered by the terminator.
-      addRegAndItsAliases(Reg, TRI, Defs);
+      for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI)
+        Defs.insert(*AI);
     }
   }
 
@@ -1675,15 +1665,15 @@ MachineBasicBlock::iterator findHoistingInsertPosAndDeps(MachineBasicBlock *MBB,
     if (!Reg)
       continue;
     if (MO.isUse()) {
-      addRegAndItsAliases(Reg, TRI, Uses);
+      for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI)
+        Uses.insert(*AI);
     } else {
       if (Uses.erase(Reg)) {
-        if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
-          for (MCSubRegIterator SubRegs(Reg, TRI); SubRegs.isValid(); ++SubRegs)
-            Uses.erase(*SubRegs); // Use sub-registers to be conservative
-        }
+        for (MCSubRegIterator SubRegs(Reg, TRI); SubRegs.isValid(); ++SubRegs)
+          Uses.erase(*SubRegs); // Use sub-registers to be conservative
       }
-      addRegAndItsAliases(Reg, TRI, Defs);
+      for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI)
+        Defs.insert(*AI);
     }
   }
 
@@ -1810,12 +1800,8 @@ bool BranchFolder::HoistCommonCodeInSuccs(MachineBasicBlock *MBB) {
       unsigned Reg = MO.getReg();
       if (!Reg || !LocalDefsSet.count(Reg))
         continue;
-      if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
-        for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI)
-          LocalDefsSet.erase(*AI);
-      } else {
-        LocalDefsSet.erase(Reg);
-      }
+      for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI)
+        LocalDefsSet.erase(*AI);
     }
 
     // Track local defs so we can update liveins.
@@ -1827,7 +1813,8 @@ bool BranchFolder::HoistCommonCodeInSuccs(MachineBasicBlock *MBB) {
       if (!Reg)
         continue;
       LocalDefs.push_back(Reg);
-      addRegAndItsAliases(Reg, TRI, LocalDefsSet);
+      for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI)
+        LocalDefsSet.insert(*AI);
     }
 
     HasDups = true;