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[X86] Update stale comment. NFC 

The optimization in ExpandIntOp_UINT_TO_FP was removed in D72728
in January 2020.
This commit is contained in:
Craig Topper 2020-09-03 16:19:10 -07:00
parent 673484b341
commit 0851350557
1 changed files with 2 additions and 4 deletions
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6
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -20149,10 +20149,8 @@ SDValue X86TargetLowering::LowerUINT_TO_FP(SDValue Op,
SDValue Store =
DAG.getStore(Chain, dl, ValueToStore, StackSlot, MPI, Align(8));
// For i64 source, we need to add the appropriate power of 2 if the input
// was negative. This is the same as the optimization in
// DAGTypeLegalizer::ExpandIntOp_UNIT_TO_FP, and for it to be safe here,
// we must be careful to do the computation in x87 extended precision, not
// in SSE. (The generic code can't know it's OK to do this, or how to.)
// was negative. We must be careful to do the computation in x87 extended
// precision, not in SSE.
SDVTList Tys = DAG.getVTList(MVT::f80, MVT::Other);
SDValue Ops[] = { Store, StackSlot };
SDValue Fild =