fixup! remove visitBF16_TO_FP

Author: Shao-Ce SUN

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -546,7 +546,6 @@ namespace {
     SDValue visitFP_TO_FP16(SDNode *N);
     SDValue visitFP16_TO_FP(SDNode *N);
     SDValue visitFP_TO_BF16(SDNode *N);
-    SDValue visitBF16_TO_FP(SDNode *N);
     SDValue visitVECREDUCE(SDNode *N);
     SDValue visitVPOp(SDNode *N);
     SDValue visitGET_FPENV_MEM(SDNode *N);
@@ -2049,7 +2048,7 @@ SDValue DAGCombiner::visit(SDNode *N) {
   case ISD::FP_TO_FP16:         return visitFP_TO_FP16(N);
   case ISD::FP16_TO_FP:         return visitFP16_TO_FP(N);
   case ISD::FP_TO_BF16:         return visitFP_TO_BF16(N);
-  case ISD::BF16_TO_FP:         return visitBF16_TO_FP(N);
+  case ISD::BF16_TO_FP:         return visitFP16_TO_FP(N);
   case ISD::FREEZE:             return visitFREEZE(N);
   case ISD::GET_FPENV_MEM:      return visitGET_FPENV_MEM(N);
   case ISD::SET_FPENV_MEM:      return visitSET_FPENV_MEM(N);
@@ -26147,7 +26146,7 @@ SDValue DAGCombiner::visitFP16_TO_FP(SDNode *N) {
   if (!TLI.shouldKeepZExtForFP16Conv() && N0->getOpcode() == ISD::AND) {
     ConstantSDNode *AndConst = getAsNonOpaqueConstant(N0.getOperand(1));
     if (AndConst && AndConst->getAPIntValue() == 0xffff) {
-      return DAG.getNode(ISD::FP16_TO_FP, SDLoc(N), N->getValueType(0),
+      return DAG.getNode(N->getOpcode(), SDLoc(N), N->getValueType(0),
                          N0.getOperand(0));
     }
   }
@@ -26165,21 +26164,6 @@ SDValue DAGCombiner::visitFP_TO_BF16(SDNode *N) {
   return SDValue();
 }
 
-SDValue DAGCombiner::visitBF16_TO_FP(SDNode *N) {
-  SDValue N0 = N->getOperand(0);
-
-  // fold bf16_to_fp(op & 0xffff) -> bf16_to_fp(op)
-  if (!TLI.shouldKeepZExtForFP16Conv() && N0->getOpcode() == ISD::AND) {
-    ConstantSDNode *AndConst = getAsNonOpaqueConstant(N0.getOperand(1));
-    if (AndConst && AndConst->getAPIntValue() == 0xffff) {
-      return DAG.getNode(ISD::BF16_TO_FP, SDLoc(N), N->getValueType(0),
-                         N0.getOperand(0));
-    }
-  }
-
-  return SDValue();
-}
-
 SDValue DAGCombiner::visitVECREDUCE(SDNode *N) {
   SDValue N0 = N->getOperand(0);
   EVT VT = N0.getValueType();