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Expand add/sub into ADD_PARTS/SUB_PARTS instead of a non-existant libcall.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19715 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-20 18:52:28 +00:00
parent 17eee18f40
commit 84f6788044
1 changed files with 41 additions and 2 deletions
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43
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -121,6 +121,8 @@ private:
bool ExpandShift(unsigned Opc, SDOperand Op, SDOperand Amt,
SDOperand &Lo, SDOperand &Hi);
void ExpandAddSub(bool isAdd, SDOperand Op, SDOperand Amt,
SDOperand &Lo, SDOperand &Hi);
SDOperand getIntPtrConstant(uint64_t Val) {
return DAG.getConstant(Val, TLI.getPointerTy());
@ -753,6 +755,18 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
}
break;
}
case ISD::ADD_PARTS:
case ISD::SUB_PARTS: {
std::vector<SDOperand> Ops;
bool Changed = false;
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
Ops.push_back(LegalizeOp(Node->getOperand(i)));
Changed |= Ops.back() != Node->getOperand(i);
}
if (Changed)
Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Ops);
break;
}
case ISD::ADD:
case ISD::SUB:
case ISD::MUL:
@ -1183,6 +1197,27 @@ SDOperand SelectionDAGLegalize::PromoteOp(SDOperand Op) {
return Result;
}
/// ExpandAddSub - Find a clever way to expand this add operation into
/// subcomponents.
void SelectionDAGLegalize::ExpandAddSub(bool isAdd, SDOperand LHS,SDOperand RHS,
SDOperand &Lo, SDOperand &Hi) {
// Expand the subcomponents.
SDOperand LHSL, LHSH, RHSL, RHSH;
ExpandOp(LHS, LHSL, LHSH);
ExpandOp(RHS, RHSL, RHSH);
// Convert this add to the appropriate ADDC pair. The low part has no carry
// in.
unsigned Opc = isAdd ? ISD::ADD_PARTS : ISD::SUB_PARTS;
std::vector<SDOperand> Ops;
Ops.push_back(LHSL);
Ops.push_back(LHSH);
Ops.push_back(RHSL);
Ops.push_back(RHSH);
Lo = DAG.getNode(Opc, LHSL.getValueType(), Ops);
Hi = Lo.getValue(1);
}
/// ExpandShift - Try to find a clever way to expand this shift operation out to
/// smaller elements. If we can't find a way that is more efficient than a
/// libcall on this target, return false. Otherwise, return true with the
@ -1444,8 +1479,12 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
LibCallName = "__lshrdi3";
break;
case ISD::ADD: LibCallName = "__adddi3"; break;
case ISD::SUB: LibCallName = "__subdi3"; break;
case ISD::ADD:
ExpandAddSub(true, Node->getOperand(0), Node->getOperand(1), Lo, Hi);
break;
case ISD::SUB:
ExpandAddSub(false, Node->getOperand(0), Node->getOperand(1), Lo, Hi);
break;
case ISD::MUL: LibCallName = "__muldi3"; break;
case ISD::SDIV: LibCallName = "__divdi3"; break;
case ISD::UDIV: LibCallName = "__udivdi3"; break;