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Implement handling of most long operators through libcalls.

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Fix a bug legalizing "ret (Val,Val)"


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19375 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-08 19:27:05 +00:00
parent cf5734dddd
commit 4e6c746899
1 changed files with 65 additions and 5 deletions
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68
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -19,6 +19,20 @@
#include <iostream>
using namespace llvm;
static const Type *getTypeFor(MVT::ValueType VT) {
switch (VT) {
default: assert(0 && "Unknown MVT!");
case MVT::i1: return Type::BoolTy;
case MVT::i8: return Type::UByteTy;
case MVT::i16: return Type::UShortTy;
case MVT::i32: return Type::UIntTy;
case MVT::i64: return Type::ULongTy;
case MVT::f32: return Type::FloatTy;
case MVT::f64: return Type::DoubleTy;
}
}
//===----------------------------------------------------------------------===//
/// SelectionDAGLegalize - This takes an arbitrary SelectionDAG as input and
/// hacks on it until the target machine can handle it. This involves
@ -403,7 +417,7 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
for (unsigned i = 1, e = Node->getNumOperands(); i != e; ++i)
switch (getTypeAction(Node->getOperand(i).getValueType())) {
case Legal:
NewValues.push_back(LegalizeOp(Node->getOperand(1)));
NewValues.push_back(LegalizeOp(Node->getOperand(i)));
break;
case Expand: {
SDOperand Lo, Hi;
@ -638,10 +652,11 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
}
}
// If we are lowering to a type that the target doesn't support, we will have
// to iterate lowering.
if (!isTypeLegal(NVT))
// Expanding to multiple registers needs to perform an optimization step, and
// is not careful to avoid operations the target does not support. Make sure
// that all generated operations are legalized in the next iteration.
NeedsAnotherIteration = true;
const char *LibCallName = 0;
LegalizeAction Action;
switch (Node->getOpcode()) {
@ -750,6 +765,51 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
// The high part is just a zero.
Hi = DAG.getConstant(0, NVT);
break;
// These operators cannot be expanded directly, emit them as calls to
// library functions.
case ISD::FP_TO_SINT:
if (Node->getOperand(0).getValueType() == MVT::f32)
LibCallName = "__fixsfdi";
else
LibCallName = "__fixdfdi";
break;
case ISD::FP_TO_UINT:
if (Node->getOperand(0).getValueType() == MVT::f32)
LibCallName = "__fixunssfdi";
else
LibCallName = "__fixunsdfdi";
break;
case ISD::ADD: LibCallName = "__adddi3"; break;
case ISD::SUB: LibCallName = "__subdi3"; break;
case ISD::MUL: LibCallName = "__muldi3"; break;
case ISD::SDIV: LibCallName = "__divdi3"; break;
case ISD::UDIV: LibCallName = "__udivdi3"; break;
case ISD::SREM: LibCallName = "__moddi3"; break;
case ISD::UREM: LibCallName = "__umoddi3"; break;
case ISD::SHL: LibCallName = "__lshrdi3"; break;
case ISD::SRA: LibCallName = "__ashrdi3"; break;
case ISD::SRL: LibCallName = "__ashldi3"; break;
}
// Int2FP -> __floatdisf/__floatdidf
// If this is to be expanded into a libcall... do so now.
if (LibCallName) {
TargetLowering::ArgListTy Args;
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i)
Args.push_back(std::make_pair(Node->getOperand(i),
getTypeFor(Node->getOperand(i).getValueType())));
SDOperand Callee = DAG.getExternalSymbol(LibCallName, TLI.getPointerTy());
// We don't care about token chains for libcalls. We just use the entry
// node as our input and ignore the output chain. This allows us to place
// calls wherever we need them to satisfy data dependences.
SDOperand Result = TLI.LowerCallTo(DAG.getEntryNode(),
getTypeFor(Op.getValueType()), Callee,
Args, DAG).first;
ExpandOp(Result, Lo, Hi);
}
// Remember in a map if the values will be reused later.