[X86] Remove useless target specific combine on TRUNCATE dag nodes.

Before revision 171146, function 'PerformTruncateCombine' used to perform
a premature lowering of TRUNCATE dag nodes.
Revision 171146 then moved all the logic implemented by PerformTruncateCombine
to a custom lowering hook. However, that revision forgot to delete
function PerformTruncateCombine from the code.

This patch removes function 'PerformTruncateCombine' since it has no effect
on the SelectionDAG. No functional change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237122 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 410d8b08a8dea027049b65d7bb0f646d91e72617..5ea17a4e8c0f1d7c6581c1e5c922cb56427e58e7 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -1586,7 +1586,6 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
   setTargetDAGCombine(ISD::ANY_EXTEND);
   setTargetDAGCombine(ISD::SIGN_EXTEND);
   setTargetDAGCombine(ISD::SIGN_EXTEND_INREG);
-  setTargetDAGCombine(ISD::TRUNCATE);
   setTargetDAGCombine(ISD::SINT_TO_FP);
   setTargetDAGCombine(ISD::SETCC);
   setTargetDAGCombine(ISD::INTRINSIC_WO_CHAIN);
@@ -20734,15 +20733,6 @@ static SDValue PerformShuffleCombine(SDNode *N, SelectionDAG &DAG,
   return SDValue();
 }
 
-/// PerformTruncateCombine - Converts truncate operation to
-/// a sequence of vector shuffle operations.
-/// It is possible when we truncate 256-bit vector to 128-bit vector
-static SDValue PerformTruncateCombine(SDNode *N, SelectionDAG &DAG,
-                                      TargetLowering::DAGCombinerInfo &DCI,
-                                      const X86Subtarget *Subtarget)  {
-  return SDValue();
-}
-
 /// XFormVExtractWithShuffleIntoLoad - Check if a vector extract from a target
 /// specific shuffle of a load can be folded into a single element load.
 /// Similar handling for VECTOR_SHUFFLE is performed by DAGCombiner, but
@@ -24305,7 +24295,6 @@ SDValue X86TargetLowering::PerformDAGCombine(SDNode *N,
   case ISD::SIGN_EXTEND:    return PerformSExtCombine(N, DAG, DCI, Subtarget);
   case ISD::SIGN_EXTEND_INREG:
     return PerformSIGN_EXTEND_INREGCombine(N, DAG, Subtarget);
-  case ISD::TRUNCATE:       return PerformTruncateCombine(N, DAG,DCI,Subtarget);
   case ISD::SETCC:          return PerformISDSETCCCombine(N, DAG, Subtarget);
   case X86ISD::SETCC:       return PerformSETCCCombine(N, DAG, DCI, Subtarget);
   case X86ISD::BRCOND:      return PerformBrCondCombine(N, DAG, DCI, Subtarget);