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Teach the SelectionDAG ISel how to turn ConstantPacked values into

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constant nodes with vector types.  Also teach the asm printer how to print
ConstantPacked constant pool entries.  This allows us to generate altivec
code such as the following, which adds a vector constantto a packed float.

LCPI1_0:  <4 x float> < float 0.0e+0, float 0.0e+0, float 0.0e+0, float 1.0e+0 >
        .space  4
        .space  4
        .space  4
        .long   1065353216      ; float 1
        .text
        .align  4
        .globl  _foo
_foo:
        lis r2, ha16(LCPI1_0)
        la r2, lo16(LCPI1_0)(r2)
        li r4, 0
        lvx v0, r4, r2
        lvx v1, r4, r3
        vaddfp v0, v1, v0
        stvx v0, r4, r3
        blr

For the llvm code:

void %foo(<4 x float> * %a) {
entry:
  %tmp1 = load <4 x float> * %a;
  %tmp2 = add <4 x float> %tmp1, < float 0.0, float 0.0, float 0.0, float 1.0 >
  store <4 x float> %tmp2, <4 x float> *%a
  ret void
}


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24616 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2005-12-06 06:18:55 +00:00
parent 4172b10ca1
commit 8cfa57b1b4
5 changed files with 66 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/llvm/CodeGen/SelectionDAGNodes.h
View File

@ -67,6 +67,10 @@ namespace ISD {
GlobalAddress, FrameIndex, ConstantPool,
BasicBlock, ExternalSymbol, VALUETYPE, CONDCODE, Register,
// ConstantVec works like Constant or ConstantFP, except that it is not a
// leaf node. All operands are either Constant or ConstantFP nodes.
ConstantVec,
// TargetConstant - Like Constant, but the DAG does not do any folding or
// simplification of the constant. This is used by the DAG->DAG selector.
TargetConstant,

8
lib/CodeGen/AsmPrinter.cpp
View File

@ -11,6 +11,7 @@
//
//===----------------------------------------------------------------------===//
#include "llvm/DerivedTypes.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/Constants.h"
#include "llvm/Module.h"
@ -326,6 +327,13 @@ void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
}
return;
}
} else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(CV)) {
const PackedType *PTy = CP->getType();
for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
EmitGlobalConstant(CP->getOperand(I));
return;
}
const Type *type = CV->getType();

26
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
View File

@ -690,6 +690,32 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
}
break;
}
case ISD::ConstantVec: {
// We assume that vector constants are not legal, and will be immediately
// spilled to the constant pool.
//
// FIXME: revisit this when we have some kind of mechanism by which targets
// can decided legality of vector constants, of which there may be very
// many.
//
// Create a ConstantPacked, and put it in the constant pool.
std::vector<Constant*> CV;
MVT::ValueType VT = Node->getValueType(0);
for (unsigned I = 0, E = Node->getNumOperands(); I < E; ++I) {
SDOperand OpN = Node->getOperand(I);
const Type* OpNTy = MVT::getTypeForValueType(OpN.getValueType());
if (MVT::isFloatingPoint(VT))
CV.push_back(ConstantFP::get(OpNTy,
cast<ConstantFPSDNode>(OpN)->getValue()));
else
CV.push_back(ConstantUInt::get(OpNTy,
cast<ConstantSDNode>(OpN)->getValue()));
}
Constant *CP = ConstantPacked::get(CV);
SDOperand CPIdx = DAG.getConstantPool(CP, Node->getValueType(0));
Result = DAG.getLoad(VT, DAG.getEntryNode(), CPIdx, DAG.getSrcValue(NULL));
break;
}
case ISD::TokenFactor:
if (Node->getNumOperands() == 2) {
bool Changed = false;

3
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -501,8 +501,6 @@ SDOperand SelectionDAG::getConstantFP(double Val, MVT::ValueType VT) {
return SDOperand(N, 0);
}
SDOperand SelectionDAG::getGlobalAddress(const GlobalValue *GV,
MVT::ValueType VT, int offset) {
SDNode *&N = GlobalValues[std::make_pair(GV, offset)];
@ -1837,6 +1835,7 @@ const char *SDNode::getOperationName(const SelectionDAG *G) const {
case ISD::Constant: return "Constant";
case ISD::TargetConstant: return "TargetConstant";
case ISD::ConstantFP: return "ConstantFP";
case ISD::ConstantVec: return "ConstantVec";
case ISD::GlobalAddress: return "GlobalAddress";
case ISD::TargetGlobalAddress: return "TargetGlobalAddress";
case ISD::FrameIndex: return "FrameIndex";

30
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -282,7 +282,8 @@ public:
SDOperand &N = NodeMap[V];
if (N.Val) return N;
MVT::ValueType VT = TLI.getValueType(V->getType());
const Type *VTy = V->getType();
MVT::ValueType VT = TLI.getValueType(VTy);
if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V)))
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
visit(CE->getOpcode(), *CE);
@ -296,6 +297,30 @@ public:
return N = DAG.getNode(ISD::UNDEF, VT);
} else if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
return N = DAG.getConstantFP(CFP->getValue(), VT);
} else if (const PackedType *PTy = dyn_cast<PackedType>(VTy)) {
unsigned NumElements = PTy->getNumElements();
MVT::ValueType PVT = TLI.getValueType(PTy->getElementType());
MVT::ValueType TVT = MVT::getVectorType(PVT, NumElements);
// Now that we know the number and type of the elements, push a
// Constant or ConstantFP node onto the ops list for each element of
// the packed constant.
std::vector<SDOperand> Ops;
for (unsigned i = 0; i < NumElements; ++i) {
const Constant *CEl = C->getOperand(i);
if (MVT::isFloatingPoint(PVT))
Ops.push_back(DAG.getConstantFP(cast<ConstantFP>(CEl)->getValue(),
PVT));
else
Ops.push_back(
DAG.getConstant(cast<ConstantIntegral>(CEl)->getRawValue(),
PVT));
}
// Handle the case where we have a 1-element vector, in which
// case we want to immediately turn it into a scalar constant.
if (Ops.size() == 1)
return N = Ops[0];
return N = DAG.getNode(ISD::ConstantVec, TVT, Ops);
} else {
// Canonicalize all constant ints to be unsigned.
return N = DAG.getConstant(cast<ConstantIntegral>(C)->getRawValue(),VT);
@ -784,8 +809,7 @@ void SelectionDAGLowering::visitLoad(LoadInst &I) {
const Type *Ty = I.getType();
SDOperand L;
if (Type::PackedTyID == Ty->getTypeID()) {
const PackedType *PTy = cast<PackedType>(Ty);
if (const PackedType *PTy = dyn_cast<PackedType>(Ty)) {
unsigned NumElements = PTy->getNumElements();
MVT::ValueType PVT = TLI.getValueType(PTy->getElementType());
MVT::ValueType TVT = MVT::getVectorType(PVT, NumElements);