6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-15 19:24:33 +00:00
Code Issues Projects Releases Wiki Activity

Teach DAG combine to fold (buildvec (Xint2fp x)) to (Xint2fp (buildvec x))

Browse Source 
- If more than 1 elemennts are defined and target supports the vectorized
  conversion, use the vectorized one instead to reduce the strength on
  conversion operation.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166546 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Liao
2012-10-24 04:14:18 +00:00
parent 991b6a22b6
commit 1a5cc710ee
2 changed files with 85 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

71
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
View File

@@ -271,6 +271,7 @@ namespace {
SDValue ReduceLoadOpStoreWidth(SDNode *N);
SDValue TransformFPLoadStorePair(SDNode *N);
SDValue reduceBuildVecExtToExtBuildVec(SDNode *N);
SDValue reduceBuildVecConvertToConvertBuildVec(SDNode *N);
SDValue GetDemandedBits(SDValue V, const APInt &Mask);
@@ -8467,6 +8468,72 @@ SDValue DAGCombiner::reduceBuildVecExtToExtBuildVec(SDNode *N) {
return DAG.getNode(ISD::BITCAST, dl, VT, BV);
}
SDValue DAGCombiner::reduceBuildVecConvertToConvertBuildVec(SDNode *N) {
EVT VT = N->getValueType(0);
unsigned NumInScalars = N->getNumOperands();
DebugLoc dl = N->getDebugLoc();
EVT SrcVT = MVT::Other;
unsigned Opcode = ISD::DELETED_NODE;
unsigned NumDefs = 0;
for (unsigned i = 0; i != NumInScalars; ++i) {
SDValue In = N->getOperand(i);
unsigned Opc = In.getOpcode();
if (Opc == ISD::UNDEF)
continue;
// If all scalar values are floats and converted from integers.
if (Opcode == ISD::DELETED_NODE &&
(Opc == ISD::UINT_TO_FP || Opc == ISD::SINT_TO_FP)) {
Opcode = Opc;
// If not supported by target, bail out.
if (TLI.getOperationAction(Opcode, VT) != TargetLowering::Legal &&
TLI.getOperationAction(Opcode, VT) != TargetLowering::Custom)
return SDValue();
}
if (Opc != Opcode)
return SDValue();
EVT InVT = In.getOperand(0).getValueType();
// If all scalar values are typed differently, bail out. It's chosen to
// simplify BUILD_VECTOR of integer types.
if (SrcVT == MVT::Other)
SrcVT = InVT;
if (SrcVT != InVT)
return SDValue();
NumDefs++;
}
// If the vector has just one element defined, it's not worth to fold it into
// a vectorized one.
if (NumDefs < 2)
return SDValue();
assert((Opcode == ISD::UINT_TO_FP || Opcode == ISD::SINT_TO_FP)
&& "Should only handle conversion from integer to float.");
assert(SrcVT != MVT::Other && "Cannot determine source type!");
EVT NVT = EVT::getVectorVT(*DAG.getContext(), SrcVT, NumInScalars);
SmallVector<SDValue, 8> Opnds;
for (unsigned i = 0; i != NumInScalars; ++i) {
SDValue In = N->getOperand(i);
if (In.getOpcode() == ISD::UNDEF)
Opnds.push_back(DAG.getUNDEF(SrcVT));
else
Opnds.push_back(In.getOperand(0));
}
SDValue BV = DAG.getNode(ISD::BUILD_VECTOR, dl, NVT,
&Opnds[0], Opnds.size());
AddToWorkList(BV.getNode());
return DAG.getNode(Opcode, dl, VT, BV);
}
SDValue DAGCombiner::visitBUILD_VECTOR(SDNode *N) {
unsigned NumInScalars = N->getNumOperands();
DebugLoc dl = N->getDebugLoc();
@@ -8480,6 +8547,10 @@ SDValue DAGCombiner::visitBUILD_VECTOR(SDNode *N) {
if (V.getNode())
return V;
V = reduceBuildVecConvertToConvertBuildVec(N);
if (V.getNode())
return V;
// Check to see if this is a BUILD_VECTOR of a bunch of EXTRACT_VECTOR_ELT
// operations. If so, and if the EXTRACT_VECTOR_ELT vector inputs come from
// at most two distinct vectors, turn this into a shuffle node.