[llvm] r337890 - [X86] Use X86ISD::MUL_IMM instead of ISD::MUL for multiply we intend to be selected to LEA.

[Craig Topper via llvm-commits]

Author: ctopper
Date: Tue Jul 24 22:33:36 2018
New Revision: 337890

URL: http://llvm.org/viewvc/llvm-project?rev=337890&view=rev
Log:
[X86] Use X86ISD::MUL_IMM instead of ISD::MUL for multiply we intend to be selected to LEA.

This prevents other combines from possibly disturbing it.

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=337890&r1=337889&r2=337890&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Tue Jul 24 22:33:36 2018
@@ -33701,7 +33701,8 @@ static SDValue combineMulSpecial(uint64_
   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;