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[X86] Prevent (bitcast (broadcast_load)) combine from producing vXf16 broadcast instructions. 

The combine tries to put the broadcast in either the integer or
fp domain to match the bitcast domain. But we can only do this
if the broadcast size is 32 or larger.
This commit is contained in:
Craig Topper 2020-03-20 08:57:28 -07:00
parent ce5173c0e1
commit 32fbea1548
1 changed files with 15 additions and 12 deletions
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27
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -37385,19 +37385,22 @@ static SDValue combineBitcast(SDNode *N, SelectionDAG &DAG,
auto *BCast = cast<MemIntrinsicSDNode>(N0);
unsigned SrcVTSize = SrcVT.getScalarSizeInBits();
unsigned MemSize = BCast->getMemoryVT().getScalarSizeInBits();
MVT MemVT = VT.isFloatingPoint() ? MVT::getFloatingPointVT(MemSize)
: MVT::getIntegerVT(MemSize);
MVT LoadVT = VT.isFloatingPoint() ? MVT::getFloatingPointVT(SrcVTSize)
: MVT::getIntegerVT(SrcVTSize);
LoadVT = MVT::getVectorVT(LoadVT, SrcVT.getVectorNumElements());
// Don't swap i8/i16 since don't have fp types that size.
if (MemSize >= 32) {
MVT MemVT = VT.isFloatingPoint() ? MVT::getFloatingPointVT(MemSize)
: MVT::getIntegerVT(MemSize);
MVT LoadVT = VT.isFloatingPoint() ? MVT::getFloatingPointVT(SrcVTSize)
: MVT::getIntegerVT(SrcVTSize);
LoadVT = MVT::getVectorVT(LoadVT, SrcVT.getVectorNumElements());
SDVTList Tys = DAG.getVTList(LoadVT, MVT::Other);
SDValue Ops[] = { BCast->getChain(), BCast->getBasePtr() };
SDValue ResNode =
DAG.getMemIntrinsicNode(X86ISD::VBROADCAST_LOAD, SDLoc(N), Tys, Ops,
MemVT, BCast->getMemOperand());
DAG.ReplaceAllUsesOfValueWith(SDValue(BCast, 1), ResNode.getValue(1));
return DAG.getBitcast(VT, ResNode);
SDVTList Tys = DAG.getVTList(LoadVT, MVT::Other);
SDValue Ops[] = { BCast->getChain(), BCast->getBasePtr() };
SDValue ResNode =
DAG.getMemIntrinsicNode(X86ISD::VBROADCAST_LOAD, SDLoc(N), Tys, Ops,
MemVT, BCast->getMemOperand());
DAG.ReplaceAllUsesOfValueWith(SDValue(BCast, 1), ResNode.getValue(1));
return DAG.getBitcast(VT, ResNode);
}
}
// Since MMX types are special and don't usually play with other vector types,