Fix MachineLICM to use the correct virtual register class when

unfolding loads for hoisting.  getOpcodeAfterMemoryUnfold returns the
opcode of the original operation without the load, not the load
itself, MachineLICM needs to know the operand index in order to get
the correct register class. Extend getOpcodeAfterMemoryUnfold to
return this information.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85622 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 2 deletions

diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h
index d64df44..1d42c32 100644
--- a/include/llvm/Target/TargetInstrInfo.h
+++ b/include/llvm/Target/TargetInstrInfo.h
@@ -405,9 +405,12 @@ public:
   /// getOpcodeAfterMemoryUnfold - Returns the opcode of the would be new
   /// instruction after load / store are unfolded from an instruction of the
   /// specified opcode. It returns zero if the specified unfolding is not
-  /// possible.
+  /// possible. If LoadRegIndex is non-null, it is filled in with the operand
+  /// index of the operand which will hold the register holding the loaded
+  /// value.
   virtual unsigned getOpcodeAfterMemoryUnfold(unsigned Opc,
-                                      bool UnfoldLoad, bool UnfoldStore) const {
+                                      bool UnfoldLoad, bool UnfoldStore,
+                                      unsigned *LoadRegIndex = 0) const {
     return 0;
   }