[llvm] 805fb1f - [X86] combineMul - move MUL_IMM comment inside function. NFC.

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2021-08-22T18:27:03+01:00
New Revision: 805fb1f6c164ebcab02356bb2500e832781b7b79

URL: https://github.com/llvm/llvm-project/commit/805fb1f6c164ebcab02356bb2500e832781b7b79
DIFF: https://github.com/llvm/llvm-project/commit/805fb1f6c164ebcab02356bb2500e832781b7b79.diff

LOG: [X86] combineMul - move MUL_IMM comment inside function. NFC.

combineMul is now used for other things as well as the mul-with-constant expansion - move the comment to where its actually relevant.

Added: 
    

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

Removed: 
    


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diff  --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 53753be52946..c70715033cc0 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -44061,8 +44061,6 @@ static SDValue combineMulToPMULDQ(SDNode *N, SelectionDAG &DAG,
   return SDValue();
 }
 
-/// Optimize a single multiply with constant into two operations in order to
-/// implement it with two cheaper instructions, e.g. LEA + SHL, LEA + LEA.
 static SDValue combineMul(SDNode *N, SelectionDAG &DAG,
                           TargetLowering::DAGCombinerInfo &DCI,
                           const X86Subtarget &Subtarget) {
@@ -44077,8 +44075,11 @@ static SDValue combineMul(SDNode *N, SelectionDAG &DAG,
   if (DCI.isBeforeLegalize() && VT.isVector())
     return reduceVMULWidth(N, DAG, Subtarget);
 
+  // Optimize a single multiply with constant into two operations in order to
+  // implement it with two cheaper instructions, e.g. LEA + SHL, LEA + LEA.
   if (!MulConstantOptimization)
     return SDValue();
+
   // An imul is usually smaller than the alternative sequence.
   if (DAG.getMachineFunction().getFunction().hasMinSize())
     return SDValue();