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Teach the ppc backend to use rol and vsldoi to generate splatted constants. 

This implements vec_constants.ll:test_vsldoi and test_rol

llvm-svn: 27760
This commit is contained in:
Chris Lattner 2006-04-17 17:55:10 +00:00
parent 8cdba16d5e
commit 264c908e3a
1 changed files with 49 additions and 15 deletions
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62
llvm/lib/Target/PowerPC/PPCISelLowering.cpp
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@ -1070,6 +1070,22 @@ static SDOperand BuildIntrinsicBinOp(unsigned IID, SDOperand LHS, SDOperand RHS,
DAG.getConstant(IID, MVT::i32), LHS, RHS);
}
/// BuildVSLDOI - Return a VECTOR_SHUFFLE that is a vsldoi of the specified
/// amount. The result has the specified value type.
static SDOperand BuildVSLDOI(SDOperand LHS, SDOperand RHS, unsigned Amt,
MVT::ValueType VT, SelectionDAG &DAG) {
// Force LHS/RHS to be the right type.
LHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, LHS);
RHS = DAG.getNode(ISD::BIT_CONVERT, MVT::v16i8, RHS);
std::vector<SDOperand> Ops;
for (unsigned i = 0; i != 16; ++i)
Ops.push_back(DAG.getConstant(i+Amt, MVT::i32));
SDOperand T = DAG.getNode(ISD::VECTOR_SHUFFLE, MVT::v16i8, LHS, RHS,
DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8, Ops));
return DAG.getNode(ISD::BIT_CONVERT, VT, T);
}
// If this is a case we can't handle, return null and let the default
// expansion code take care of it. If we CAN select this case, and if it
// selects to a single instruction, return Op. Otherwise, if we can codegen
@ -1179,10 +1195,33 @@ static SDOperand LowerBUILD_VECTOR(SDOperand Op, SelectionDAG &DAG) {
return BuildIntrinsicBinOp(IIDs[SplatSize-1], Op, Op, DAG);
}
// TODO: ROL.
// vsplti + rol self.
if (SextVal == (int)(((unsigned)i << TypeShiftAmt) |
((unsigned)i >> (SplatBitSize-TypeShiftAmt)))) {
Op = BuildSplatI(i, SplatSize, Op.getValueType(), DAG);
static const unsigned IIDs[] = { // Intrinsic to use for each size.
Intrinsic::ppc_altivec_vrlb, Intrinsic::ppc_altivec_vrlh, 0,
Intrinsic::ppc_altivec_vrlw
};
return BuildIntrinsicBinOp(IIDs[SplatSize-1], Op, Op, DAG);
}
// t = vsplti c, result = vsldoi t, t, 1
if (SextVal == ((i << 8) | (i >> (TypeShiftAmt-8)))) {
SDOperand T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG);
return BuildVSLDOI(T, T, 1, Op.getValueType(), DAG);
}
// t = vsplti c, result = vsldoi t, t, 2
if (SextVal == ((i << 16) | (i >> (TypeShiftAmt-16)))) {
SDOperand T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG);
return BuildVSLDOI(T, T, 2, Op.getValueType(), DAG);
}
// t = vsplti c, result = vsldoi t, t, 3
if (SextVal == ((i << 24) | (i >> (TypeShiftAmt-24)))) {
SDOperand T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG);
return BuildVSLDOI(T, T, 3, Op.getValueType(), DAG);
}
}
// Three instruction sequences.
@ -1224,6 +1263,10 @@ static SDOperand GeneratePerfectShuffle(unsigned PFEntry, SDOperand LHS,
return RHS;
}
SDOperand OpLHS, OpRHS;
OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG);
OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG);
unsigned ShufIdxs[16];
switch (OpNum) {
default: assert(0 && "Unknown i32 permute!");
@ -1256,24 +1299,15 @@ static SDOperand GeneratePerfectShuffle(unsigned PFEntry, SDOperand LHS,
ShufIdxs[i] = (i&3)+12;
break;
case OP_VSLDOI4:
for (unsigned i = 0; i != 16; ++i)
ShufIdxs[i] = i+4;
break;
return BuildVSLDOI(OpLHS, OpRHS, 4, OpLHS.getValueType(), DAG);
case OP_VSLDOI8:
for (unsigned i = 0; i != 16; ++i)
ShufIdxs[i] = i+8;
break;
return BuildVSLDOI(OpLHS, OpRHS, 8, OpLHS.getValueType(), DAG);
case OP_VSLDOI12:
for (unsigned i = 0; i != 16; ++i)
ShufIdxs[i] = i+12;
break;
return BuildVSLDOI(OpLHS, OpRHS, 12, OpLHS.getValueType(), DAG);
}
std::vector<SDOperand> Ops;
for (unsigned i = 0; i != 16; ++i)
Ops.push_back(DAG.getConstant(ShufIdxs[i], MVT::i32));
SDOperand OpLHS, OpRHS;
OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG);
OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG);
return DAG.getNode(ISD::VECTOR_SHUFFLE, OpLHS.getValueType(), OpLHS, OpRHS,
DAG.getNode(ISD::BUILD_VECTOR, MVT::v16i8, Ops));