[X86] Use X86ISD::MUL_IMM instead of ISD::MUL for multiply we intend to be selected...

This prevents other combines from possibly disturbing it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337890 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index c7deffd56193b843e118e1fcfe653143362ff67f..e019fbdfa1ab6558e58ac564a6628aa48f30709e 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -33701,7 +33701,8 @@ static SDValue combineMulSpecial(uint64_t MulAmt, SDNode *N, SelectionDAG &DAG,
   auto combineMulMulAddOrSub = [&](int Mul1, int Mul2, bool isAdd) {
     SDValue Result = DAG.getNode(X86ISD::MUL_IMM, DL, VT, N->getOperand(0),
                                  DAG.getConstant(Mul1, DL, VT));
-    Result = DAG.getNode(ISD::MUL, DL, VT, Result, DAG.getConstant(Mul2, DL, VT));
+    Result = DAG.getNode(X86ISD::MUL_IMM, DL, VT, Result,
+                         DAG.getConstant(Mul2, DL, VT));
     Result = DAG.getNode(isAdd ? ISD::ADD : ISD::SUB, DL, VT, Result,
                          N->getOperand(0));
     return Result;