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Change ConstantSDNode and ConstantFPSDNode to use ConstantInt* and

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ConstantFP* instead of APInt and APFloat directly.

This reduces the amount of time to create ConstantSDNode
and ConstantFPSDNode nodes when ConstantInt* and ConstantFP*
respectively are already available, as is the case in
SelectionDAGBuild.cpp. Also, it reduces the amount of time
to legalize constants into constant pools, and the amount of
time to add ConstantFP operands to MachineInstrs, due to
eliminating ConstantInt::get and ConstantFP::get calls.

It increases the amount of work needed to create new constants
in cases where the client doesn't already have a ConstantInt*
or ConstantFP*, such as legalize expanding 64-bit integer constants
to 32-bit constants. And it adds a layer of indirection for the
accessor methods. But these appear to be outweight by the benefits
in most cases.

It will also make it easier to make ConstantSDNode and
ConstantFPNode more consistent with ConstantInt and ConstantFP.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56162 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-09-12 18:08:03 +00:00
parent 913d3dfac4
commit 4fbd796a12
10 changed files with 53 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@@ -69,7 +69,7 @@ SelectionDAG::DAGUpdateListener::~DAGUpdateListener() {}
/// As such, this method can be used to do an exact bit-for-bit comparison of
/// two floating point values.
bool ConstantFPSDNode::isExactlyValue(const APFloat& V) const {
return Value.bitwiseIsEqual(V);
return getValueAPF().bitwiseIsEqual(V);
}
bool ConstantFPSDNode::isValueValidForType(MVT VT,
@@ -367,11 +367,11 @@ static void AddNodeIDNode(FoldingSetNodeID &ID, const SDNode *N) {
break;
case ISD::TargetConstant:
case ISD::Constant:
ID.Add(cast<ConstantSDNode>(N)->getAPIntValue());
ID.AddPointer(cast<ConstantSDNode>(N)->getConstantIntValue());
break;
case ISD::TargetConstantFP:
case ISD::ConstantFP: {
ID.Add(cast<ConstantFPSDNode>(N)->getValueAPF());
ID.AddPointer(cast<ConstantFPSDNode>(N)->getConstantFPValue());
break;
}
case ISD::TargetGlobalAddress:
@@ -861,6 +861,10 @@ SDValue SelectionDAG::getConstant(uint64_t Val, MVT VT, bool isT) {
}
SDValue SelectionDAG::getConstant(const APInt &Val, MVT VT, bool isT) {
return getConstant(*ConstantInt::get(Val), VT, isT);
}
SDValue SelectionDAG::getConstant(const ConstantInt &Val, MVT VT, bool isT) {
assert(VT.isInteger() && "Cannot create FP integer constant!");
MVT EltVT = VT.isVector() ? VT.getVectorElementType() : VT;
@@ -870,7 +874,7 @@ SDValue SelectionDAG::getConstant(const APInt &Val, MVT VT, bool isT) {
unsigned Opc = isT ? ISD::TargetConstant : ISD::Constant;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0);
ID.Add(Val);
ID.AddPointer(&Val);
void *IP = 0;
SDNode *N = NULL;
if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
@@ -878,7 +882,7 @@ SDValue SelectionDAG::getConstant(const APInt &Val, MVT VT, bool isT) {
return SDValue(N, 0);
if (!N) {
N = NodeAllocator.Allocate<ConstantSDNode>();
new (N) ConstantSDNode(isT, Val, EltVT);
new (N) ConstantSDNode(isT, &Val, EltVT);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
}
@@ -898,6 +902,10 @@ SDValue SelectionDAG::getIntPtrConstant(uint64_t Val, bool isTarget) {
SDValue SelectionDAG::getConstantFP(const APFloat& V, MVT VT, bool isTarget) {
return getConstantFP(*ConstantFP::get(V), VT, isTarget);
}
SDValue SelectionDAG::getConstantFP(const ConstantFP& V, MVT VT, bool isTarget){
assert(VT.isFloatingPoint() && "Cannot create integer FP constant!");
MVT EltVT =
@@ -909,7 +917,7 @@ SDValue SelectionDAG::getConstantFP(const APFloat& V, MVT VT, bool isTarget) {
unsigned Opc = isTarget ? ISD::TargetConstantFP : ISD::ConstantFP;
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0);
ID.Add(V);
ID.AddPointer(&V);
void *IP = 0;
SDNode *N = NULL;
if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
@@ -917,7 +925,7 @@ SDValue SelectionDAG::getConstantFP(const APFloat& V, MVT VT, bool isTarget) {
return SDValue(N, 0);
if (!N) {
N = NodeAllocator.Allocate<ConstantFPSDNode>();
new (N) ConstantFPSDNode(isTarget, V, EltVT);
new (N) ConstantFPSDNode(isTarget, &V, EltVT);
CSEMap.InsertNode(N, IP);
AllNodes.push_back(N);
}