From 1d17d199a4cd6190fdf82e35c42b617eaae2cd35 Mon Sep 17 00:00:00 2001 From: Eli Friedman Date: Mon, 2 Aug 2010 04:42:25 +0000 Subject: PR7586: Make sure we don't claim that unknown bits are actually known in the ISD::AND case of TargetLowering::SimplifyDemandedBits. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110019 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/TargetLowering.cpp | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'lib/CodeGen/SelectionDAG/TargetLowering.cpp') diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp index 908a9d8..9772d55 100644 --- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp +++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp @@ -1497,11 +1497,10 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op, // present in the input. APInt NewBits = APInt::getHighBitsSet(BitWidth, - BitWidth - EVT.getScalarType().getSizeInBits()) & - NewMask; + BitWidth - EVT.getScalarType().getSizeInBits()); // If none of the extended bits are demanded, eliminate the sextinreg. - if (NewBits == 0) + if ((NewBits & NewMask) == 0) return TLO.CombineTo(Op, Op.getOperand(0)); APInt InSignBit = APInt::getSignBit(EVT.getScalarType().getSizeInBits()); -- cgit v1.1