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Make PPC call lowering more aggressive, making the isel matching code simple

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enough to be autogenerated.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28354 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-05-17 19:00:46 +00:00
parent 7e399c14ab
commit c703a8fbf8
4 changed files with 98 additions and 84 deletions
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64
lib/Target/PowerPC/PPCISelDAGToDAG.cpp
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@@ -152,7 +152,6 @@ namespace {
private:
SDOperand SelectSETCC(SDOperand Op);
SDOperand SelectCALL(SDOperand Op);
};
}
@@ -864,66 +863,6 @@ SDOperand PPCDAGToDAGISel::SelectSETCC(SDOperand Op) {
}
}
/// isCallCompatibleAddress - Return true if the specified 32-bit value is
/// representable in the immediate field of a Bx instruction.
static bool isCallCompatibleAddress(ConstantSDNode *C) {
int Addr = C->getValue();
if (Addr & 3) return false; // Low 2 bits are implicitly zero.
return (Addr << 6 >> 6) == Addr; // Top 6 bits have to be sext of immediate.
}
SDOperand PPCDAGToDAGISel::SelectCALL(SDOperand Op) {
SDNode *N = Op.Val;
SDOperand Chain, Flag;
Select(Chain, N->getOperand(0));
if (N->getNumOperands() == 3) // input flag
Select(Flag, N->getOperand(2));
unsigned CallOpcode;
std::vector<SDOperand> CallArgs;
if (GlobalAddressSDNode *GASD =
dyn_cast<GlobalAddressSDNode>(N->getOperand(1))) {
CallOpcode = PPC::BL;
CallArgs.push_back(N->getOperand(1));
} else if (ExternalSymbolSDNode *ESSDN =
dyn_cast<ExternalSymbolSDNode>(N->getOperand(1))) {
CallOpcode = PPC::BL;
CallArgs.push_back(N->getOperand(1));
} else if (isa<ConstantSDNode>(N->getOperand(1)) &&
isCallCompatibleAddress(cast<ConstantSDNode>(N->getOperand(1)))) {
ConstantSDNode *C = cast<ConstantSDNode>(N->getOperand(1));
CallOpcode = PPC::BLA;
CallArgs.push_back(getI32Imm((int)C->getValue() >> 2));
} else {
// Copy the callee address into the CTR register.
SDOperand Callee;
Select(Callee, N->getOperand(1));
if (Flag.Val)
Chain = SDOperand(CurDAG->getTargetNode(PPC::MTCTR, MVT::Other, MVT::Flag,
Callee, Chain, Flag), 0);
else
Chain = SDOperand(CurDAG->getTargetNode(PPC::MTCTR, MVT::Other, MVT::Flag,
Callee, Chain), 0);
Flag = Chain.getValue(1);
// Copy the callee address into R12 on darwin.
Chain = CurDAG->getCopyToReg(Chain, PPC::R12, Callee, Flag);
Flag = Chain.getValue(1);
CallOpcode = PPC::BCTRL;
}
// Emit the call itself.
CallArgs.push_back(Chain);
if (Flag.Val)
CallArgs.push_back(Flag);
Chain = SDOperand(CurDAG->getTargetNode(CallOpcode, MVT::Other, MVT::Flag,
CallArgs), 0);
CodeGenMap[Op.getValue(0)] = Chain;
CodeGenMap[Op.getValue(1)] = Chain.getValue(1);
return Chain.getValue(Op.ResNo);
}
// Select - Convert the specified operand from a target-independent to a
// target-specific node if it hasn't already been changed.
@@ -947,9 +886,6 @@ void PPCDAGToDAGISel::Select(SDOperand &Result, SDOperand Op) {
case ISD::SETCC:
Result = SelectSETCC(Op);
return;
case PPCISD::CALL:
Result = SelectCALL(Op);
return;
case PPCISD::GlobalBaseReg:
Result = getGlobalBaseReg();
return;