Author: hans Date: Tue Aug 22 09:17:32 2017 New Revision: 311462 URL: http://llvm.org/viewvc/llvm-project?rev=311462&view=rev Log: Merging r311429: ------------------------------------------------------------------------ r311429 | ctopper | 2017-08-21 22:40:17 -0700 (Mon, 21 Aug 2017) | 9 lines
[X86] Prevent several calls to ISD::isConstantSplatVector from returning a narrower APInt than the original scalar type ISD::isConstantSplatVector can shrink to the smallest splat width. But we don't check the size of the resulting APInt at all. This can cause us to misinterpret the results. This patch just adds a flag to prevent the APInt from changing width. Fixes PR34271. Differential Revision: https://reviews.llvm.org/D36996 ------------------------------------------------------------------------ Added: llvm/branches/release_50/test/CodeGen/X86/pr34271-1.ll - copied unchanged from r311429, llvm/trunk/test/CodeGen/X86/pr34271-1.ll llvm/branches/release_50/test/CodeGen/X86/pr34271.ll - copied unchanged from r311429, llvm/trunk/test/CodeGen/X86/pr34271.ll Modified: llvm/branches/release_50/ (props changed) llvm/branches/release_50/include/llvm/CodeGen/SelectionDAGNodes.h llvm/branches/release_50/lib/CodeGen/SelectionDAG/SelectionDAG.cpp llvm/branches/release_50/lib/Target/X86/X86ISelLowering.cpp Propchange: llvm/branches/release_50/ ------------------------------------------------------------------------------ --- svn:mergeinfo (original) +++ svn:mergeinfo Tue Aug 22 09:17:32 2017 @@ -1,3 +1,3 @@ /llvm/branches/Apple/Pertwee:110850,110961 /llvm/branches/type-system-rewrite:133420-134817 -/llvm/trunk:155241,308483-308484,308503,308808,308813,308847,308891,308906,308950,308963,308978,308986,309044,309071,309113,309120,309122,309140,309227,309302,309321,309323,309325,309330,309343,309353,309355,309422,309481,309483,309495,309555,309561,309594,309614,309651,309744,309758,309849,309928,309930,309945,310066,310071,310190,310240-310242,310250,310253,310262,310267,310481,310492,310498,310510,310534,310552,310604,310712,310779,310784,310796,310842,310906,310926,310939,310979,310988,310990-310991,311061,311068,311071,311087,311229,311258 +/llvm/trunk:155241,308483-308484,308503,308808,308813,308847,308891,308906,308950,308963,308978,308986,309044,309071,309113,309120,309122,309140,309227,309302,309321,309323,309325,309330,309343,309353,309355,309422,309481,309483,309495,309555,309561,309594,309614,309651,309744,309758,309849,309928,309930,309945,310066,310071,310190,310240-310242,310250,310253,310262,310267,310481,310492,310498,310510,310534,310552,310604,310712,310779,310784,310796,310842,310906,310926,310939,310979,310988,310990-310991,311061,311068,311071,311087,311229,311258,311429 Modified: llvm/branches/release_50/include/llvm/CodeGen/SelectionDAGNodes.h URL: http://llvm.org/viewvc/llvm-project/llvm/branches/release_50/include/llvm/CodeGen/SelectionDAGNodes.h?rev=311462&r1=311461&r2=311462&view=diff ============================================================================== --- llvm/branches/release_50/include/llvm/CodeGen/SelectionDAGNodes.h (original) +++ llvm/branches/release_50/include/llvm/CodeGen/SelectionDAGNodes.h Tue Aug 22 09:17:32 2017 @@ -85,7 +85,10 @@ namespace ISD { /// If N is a BUILD_VECTOR node whose elements are all the same constant or /// undefined, return true and return the constant value in \p SplatValue. - bool isConstantSplatVector(const SDNode *N, APInt &SplatValue); + /// This sets \p SplatValue to the smallest possible splat unless AllowShrink + /// is set to false. + bool isConstantSplatVector(const SDNode *N, APInt &SplatValue, + bool AllowShrink = true); /// Return true if the specified node is a BUILD_VECTOR where all of the /// elements are ~0 or undef. Modified: llvm/branches/release_50/lib/CodeGen/SelectionDAG/SelectionDAG.cpp URL: http://llvm.org/viewvc/llvm-project/llvm/branches/release_50/lib/CodeGen/SelectionDAG/SelectionDAG.cpp?rev=311462&r1=311461&r2=311462&view=diff ============================================================================== --- llvm/branches/release_50/lib/CodeGen/SelectionDAG/SelectionDAG.cpp (original) +++ llvm/branches/release_50/lib/CodeGen/SelectionDAG/SelectionDAG.cpp Tue Aug 22 09:17:32 2017 @@ -116,7 +116,8 @@ bool ConstantFPSDNode::isValueValidForTy // ISD Namespace //===----------------------------------------------------------------------===// -bool ISD::isConstantSplatVector(const SDNode *N, APInt &SplatVal) { +bool ISD::isConstantSplatVector(const SDNode *N, APInt &SplatVal, + bool AllowShrink) { auto *BV = dyn_cast<BuildVectorSDNode>(N); if (!BV) return false; @@ -124,9 +125,11 @@ bool ISD::isConstantSplatVector(const SD APInt SplatUndef; unsigned SplatBitSize; bool HasUndefs; - EVT EltVT = N->getValueType(0).getVectorElementType(); - return BV->isConstantSplat(SplatVal, SplatUndef, SplatBitSize, HasUndefs) && - EltVT.getSizeInBits() >= SplatBitSize; + unsigned EltSize = N->getValueType(0).getVectorElementType().getSizeInBits(); + unsigned MinSplatBits = AllowShrink ? 0 : EltSize; + return BV->isConstantSplat(SplatVal, SplatUndef, SplatBitSize, HasUndefs, + MinSplatBits) && + EltSize >= SplatBitSize; } // FIXME: AllOnes and AllZeros duplicate a lot of code. Could these be Modified: llvm/branches/release_50/lib/Target/X86/X86ISelLowering.cpp URL: http://llvm.org/viewvc/llvm-project/llvm/branches/release_50/lib/Target/X86/X86ISelLowering.cpp?rev=311462&r1=311461&r2=311462&view=diff ============================================================================== --- llvm/branches/release_50/lib/Target/X86/X86ISelLowering.cpp (original) +++ llvm/branches/release_50/lib/Target/X86/X86ISelLowering.cpp Tue Aug 22 09:17:32 2017 @@ -29540,8 +29540,9 @@ static bool detectZextAbsDiff(const SDVa // In SetLT case, The second operand of the comparison can be either 1 or 0. APInt SplatVal; if ((CC == ISD::SETLT) && - !((ISD::isConstantSplatVector(SetCC.getOperand(1).getNode(), SplatVal) && - SplatVal == 1) || + !((ISD::isConstantSplatVector(SetCC.getOperand(1).getNode(), SplatVal, + /*AllowShrink*/false) && + SplatVal.isOneValue()) || (ISD::isBuildVectorAllZeros(SetCC.getOperand(1).getNode())))) return false; @@ -32058,7 +32059,8 @@ static SDValue combineAndMaskToShift(SDN return SDValue(); APInt SplatVal; - if (!ISD::isConstantSplatVector(Op1.getNode(), SplatVal) || + if (!ISD::isConstantSplatVector(Op1.getNode(), SplatVal, + /*AllowShrink*/false) || !SplatVal.isMask()) return SDValue(); @@ -32642,7 +32644,8 @@ static SDValue detectUSatPattern(SDValue "Unexpected types for truncate operation"); APInt C; - if (ISD::isConstantSplatVector(In.getOperand(1).getNode(), C)) { + if (ISD::isConstantSplatVector(In.getOperand(1).getNode(), C, + /*AllowShrink*/false)) { // C should be equal to UINT32_MAX / UINT16_MAX / UINT8_MAX according // the element size of the destination type. return C.isMask(VT.getScalarSizeInBits()) ? In.getOperand(0) : @@ -35346,7 +35349,8 @@ static SDValue combineIncDecVector(SDNod SDNode *N1 = N->getOperand(1).getNode(); APInt SplatVal; - if (!ISD::isConstantSplatVector(N1, SplatVal) || !SplatVal.isOneValue()) + if (!ISD::isConstantSplatVector(N1, SplatVal, /*AllowShrink*/false) || + !SplatVal.isOneValue()) return SDValue(); SDValue AllOnesVec = getOnesVector(VT, DAG, SDLoc(N)); _______________________________________________ llvm-branch-commits mailing list llvm-branch-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-branch-commits
