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Revert r234809 because it caused PR23246.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235062 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2015-04-16 00:56:20 +00:00
parent f96076ed80
commit 782028b4bc
2 changed files with 0 additions and 185 deletions
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60
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -11499,62 +11499,6 @@ SDValue DAGCombiner::visitBUILD_VECTOR(SDNode *N) {
return SDValue();
}
static SDValue combineConcatVectorOfScalars(SDNode *N, SelectionDAG &DAG) {
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
EVT OpVT = N->getOperand(0).getValueType();
// If the operands are legal vectors, leave them alone.
if (TLI.isTypeLegal(OpVT))
return SDValue();
SDLoc DL(N);
EVT VT = N->getValueType(0);
SmallVector<SDValue, 8> Ops;
EVT SVT = EVT::getIntegerVT(*DAG.getContext(), OpVT.getSizeInBits());
SDValue ScalarUndef = DAG.getNode(ISD::UNDEF, DL, SVT);
// Keep track of what we encounter.
bool AnyInteger = false;
bool AnyFP = false;
for (const SDValue &Op : N->ops()) {
if (ISD::BITCAST == Op.getOpcode() &&
!Op.getOperand(0).getValueType().isVector())
Ops.push_back(Op.getOperand(0));
else if (ISD::UNDEF == Op.getOpcode())
Ops.push_back(ScalarUndef);
else
return SDValue();
if (Ops.back().getValueType().isFloatingPoint())
AnyFP = true;
else
AnyInteger = true;
}
// If any of the operands is a floating point scalar bitcast to a vector,
// use floating point types throughout, and bitcast everything.
// Replace UNDEFs by another scalar UNDEF node, of the final desired type.
if (AnyFP) {
SVT = EVT::getFloatingPointVT(OpVT.getSizeInBits());
ScalarUndef = DAG.getNode(ISD::UNDEF, DL, SVT);
if (AnyInteger) {
for (SDValue &Op : Ops) {
if (Op.getValueType() != SVT) {
Op = DAG.getNode(ISD::BITCAST, DL, SVT, Op);
if (Op.getOpcode() == ISD::UNDEF)
Op = ScalarUndef;
}
}
}
}
EVT VecVT = EVT::getVectorVT(*DAG.getContext(), SVT,
VT.getSizeInBits() / SVT.getSizeInBits());
return DAG.getNode(ISD::BITCAST, DL, VT,
DAG.getNode(ISD::BUILD_VECTOR, DL, VecVT, Ops));
}
SDValue DAGCombiner::visitCONCAT_VECTORS(SDNode *N) {
// TODO: Check to see if this is a CONCAT_VECTORS of a bunch of
// EXTRACT_SUBVECTOR operations. If so, and if the EXTRACT_SUBVECTOR vector
@ -11657,10 +11601,6 @@ SDValue DAGCombiner::visitCONCAT_VECTORS(SDNode *N) {
return DAG.getNode(ISD::BUILD_VECTOR, SDLoc(N), VT, Opnds);
}
// Fold CONCAT_VECTORS of only bitcast scalars (or undef) to BUILD_VECTOR.
if (SDValue V = combineConcatVectorOfScalars(N, DAG))
return V;
// Type legalization of vectors and DAG canonicalization of SHUFFLE_VECTOR
// nodes often generate nop CONCAT_VECTOR nodes.
// Scan the CONCAT_VECTOR operands and look for a CONCAT operations that