Revert "Use MachineInstr::readsWritesVirtualRegister to determine if a register is read."

This reverts r104322. I think it was causing miscompilations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104323 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 11 deletions

diff --git a/include/llvm/CodeGen/MachineInstr.h b/include/llvm/CodeGen/MachineInstr.h
index cd72344..5e62f0b 100644
--- a/include/llvm/CodeGen/MachineInstr.h
+++ b/include/llvm/CodeGen/MachineInstr.h
@@ -28,7 +28,6 @@
 
 namespace llvm {
 
-template <typename T> class SmallVectorImpl;
 class AliasAnalysis;
 class TargetInstrDesc;
 class TargetInstrInfo;
@@ -240,16 +239,7 @@ public:
   /// readsVirtualRegister - Return true if the MachineInstr reads the specified
   /// virtual register. Take into account that a partial define is a
   /// read-modify-write operation.
-  bool readsVirtualRegister(unsigned Reg) const {
-    return readsWritesVirtualRegister(Reg).first;
-  }
-
-  /// readsWritesVirtualRegister - Return a pair of bools (reads, writes)
-  /// indicating if this instruction reads or writes Reg. This also considers
-  /// partial defines.
-  /// If Ops is not null, all operand indices for Reg are added.
-  std::pair<bool,bool> readsWritesVirtualRegister(unsigned Reg,
-                                      SmallVectorImpl<unsigned> *Ops = 0) const;
+  bool readsVirtualRegister(unsigned Reg) const;
 
   /// killsRegister - Return true if the MachineInstr kills the specified
   /// register. If TargetRegisterInfo is passed, then it also checks if there is