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[x86] Clarify that this lowering only applies to vectors and is only 

used when we have SSE2.

llvm-svn: 212300
This commit is contained in:
Chandler Carruth 2014-07-03 22:57:44 +00:00
parent 2f0647cfdc
commit 19cff8205e
1 changed files with 2 additions and 3 deletions
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5
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -15481,15 +15481,14 @@ static SDValue LowerScalarVariableShift(SDValue Op, SelectionDAG &DAG,
static SDValue LowerShift(SDValue Op, const X86Subtarget* Subtarget,
SelectionDAG &DAG) {
MVT VT = Op.getSimpleValueType();
SDLoc dl(Op);
SDValue R = Op.getOperand(0);
SDValue Amt = Op.getOperand(1);
SDValue V;
if (!Subtarget->hasSSE2())
return SDValue();
assert(VT.isVector() && "Custom lowering only for vector shifts!");
assert(Subtarget->hasSSE2() && "Only custom lower when we have SSE2!");
V = LowerScalarImmediateShift(Op, DAG, Subtarget);
if (V.getNode())