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Fix the last remaining bug preventing us from switching the X86 BE over

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from the simple isel to the pattern isel.  This forces inserted libcalls
to serialize against other function calls, which was breaking
UnitTests/2005-05-12-Int64ToFP.  Hopefully this will fix issues on other
targets as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21872 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-05-11 19:02:11 +00:00
parent 27e9b41464
commit 0d67f0c80f
1 changed files with 68 additions and 30 deletions
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98
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -908,6 +908,7 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
} else {
assert(0 && "Unknown op!");
}
// FIXME: THESE SHOULD USE ExpandLibCall ??!?
std::pair<SDOperand,SDOperand> CallResult =
TLI.LowerCallTo(Tmp1, Type::VoidTy, false,
DAG.getExternalSymbol(FnName, IntPtr), Args, DAG);
@ -1222,6 +1223,7 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
}
std::vector<std::pair<SDOperand, const Type*> > Args;
Args.push_back(std::make_pair(Tmp1, T));
// FIXME: should use ExpandLibCall!
std::pair<SDOperand,SDOperand> CallResult =
TLI.LowerCallTo(DAG.getEntryNode(), T, false,
DAG.getExternalSymbol(FnName, VT), Args, DAG);
@ -1984,15 +1986,30 @@ static SDNode *FindAdjCallStackUp(SDNode *Node) {
abort();
}
/// FindAdjCallStackDown - Given a chained node that is part of a call sequence,
/// find the ADJCALLSTACKDOWN node that initiates the call sequence.
static SDNode *FindAdjCallStackDown(SDNode *Node) {
assert(Node && "Didn't find adjcallstackdown for a call??");
if (Node->getOpcode() == ISD::ADJCALLSTACKDOWN) return Node;
assert(Node->getOperand(0).getValueType() == MVT::Other &&
"Node doesn't have a token chain argument!");
return FindAdjCallStackDown(Node->getOperand(0).Val);
}
/// FindInputOutputChains - If we are replacing an operation with a call we need
/// to find the call that occurs before and the call that occurs after it to
/// properly serialize the calls in the block.
/// properly serialize the calls in the block. The returned operand is the
/// input chain value for the new call (e.g. the entry node or the previous
/// call), and OutChain is set to be the chain node to update to point to the
/// end of the call chain.
static SDOperand FindInputOutputChains(SDNode *OpNode, SDNode *&OutChain,
SDOperand Entry) {
SDNode *LatestAdjCallStackDown = Entry.Val;
SDNode *LatestAdjCallStackUp = 0;
FindLatestAdjCallStackDown(OpNode, LatestAdjCallStackDown);
//std::cerr << "Found node: "; LatestAdjCallStackDown->dump(); std::cerr <<"\n";
//std::cerr<<"Found node: "; LatestAdjCallStackDown->dump(); std::cerr <<"\n";
// It is possible that no ISD::ADJCALLSTACKDOWN was found because there is no
// previous call in the function. LatestCallStackDown may in that case be
@ -2004,17 +2021,33 @@ static SDOperand FindInputOutputChains(SDNode *OpNode, SDNode *&OutChain,
LatestAdjCallStackUp = Entry.Val;
assert(LatestAdjCallStackUp && "NULL return from FindAdjCallStackUp");
SDNode *EarliestAdjCallStackUp = 0;
FindEarliestAdjCallStackUp(OpNode, EarliestAdjCallStackUp);
// Finally, find the first call that this must come before, first we find the
// adjcallstackup that ends the call.
OutChain = 0;
FindEarliestAdjCallStackUp(OpNode, OutChain);
if (EarliestAdjCallStackUp) {
//std::cerr << "Found node: ";
//EarliestAdjCallStackUp->dump(); std::cerr <<"\n";
}
// If we found one, translate from the adj up to the adjdown.
if (OutChain)
OutChain = FindAdjCallStackDown(OutChain);
return SDOperand(LatestAdjCallStackUp, 0);
}
/// SpliceCallInto - Given the result chain of a libcall (CallResult), and a
static void SpliceCallInto(const SDOperand &CallResult, SDNode *OutChain,
SelectionDAG &DAG) {
// Nothing to splice it into?
if (OutChain == 0) return;
assert(OutChain->getOperand(0).getValueType() == MVT::Other);
//OutChain->dump();
// Form a token factor node merging the old inval and the new inval.
SDOperand InToken = DAG.getNode(ISD::TokenFactor, MVT::Other, CallResult,
OutChain->getOperand(0));
// Change the node to refer to the new token.
OutChain->setAdjCallChain(InToken);
}
// ExpandLibCall - Expand a node into a call to a libcall. If the result value
@ -2037,21 +2070,21 @@ SDOperand SelectionDAGLegalize::ExpandLibCall(const char *Name, SDNode *Node,
}
SDOperand Callee = DAG.getExternalSymbol(Name, 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.
// Splice the libcall in wherever FindInputOutputChains tells us to.
const Type *RetTy = MVT::getTypeForValueType(Node->getValueType(0));
SDOperand Result = TLI.LowerCallTo(InChain, RetTy, false, Callee,
Args, DAG).first;
switch (getTypeAction(Result.getValueType())) {
std::pair<SDOperand,SDOperand> CallInfo =
TLI.LowerCallTo(InChain, RetTy, false, Callee, Args, DAG);
SpliceCallInto(CallInfo.second, OutChain, DAG);
switch (getTypeAction(CallInfo.first.getValueType())) {
default: assert(0 && "Unknown thing");
case Legal:
return Result;
return CallInfo.first;
case Promote:
assert(0 && "Cannot promote this yet!");
case Expand:
SDOperand Lo;
ExpandOp(Result, Lo, Hi);
ExpandOp(CallInfo.first, Lo, Hi);
return Lo;
}
}
@ -2066,19 +2099,7 @@ ExpandIntToFP(bool isSigned, MVT::ValueType DestTy, SDOperand Source) {
"This is not an expansion!");
assert(Source.getValueType() == MVT::i64 && "Only handle expand from i64!");
SDNode *OutChain;
SDOperand InChain = FindInputOutputChains(Source.Val, OutChain,
DAG.getEntryNode());
const char *FnName = 0;
if (isSigned) {
if (DestTy == MVT::f32)
FnName = "__floatdisf";
else {
assert(DestTy == MVT::f64 && "Unknown fp value type!");
FnName = "__floatdidf";
}
} else {
if (!isSigned) {
// If this is unsigned, and not supported, first perform the conversion to
// signed, then adjust the result if the sign bit is set.
SDOperand SignedConv = ExpandIntToFP(true, DestTy, Source);
@ -2116,6 +2137,18 @@ ExpandIntToFP(bool isSigned, MVT::ValueType DestTy, SDOperand Source) {
}
return DAG.getNode(ISD::ADD, DestTy, SignedConv, FudgeInReg);
}
SDNode *OutChain = 0;
SDOperand InChain = FindInputOutputChains(Source.Val, OutChain,
DAG.getEntryNode());
const char *FnName = 0;
if (DestTy == MVT::f32)
FnName = "__floatdisf";
else {
assert(DestTy == MVT::f64 && "Unknown fp value type!");
FnName = "__floatdidf";
}
SDOperand Callee = DAG.getExternalSymbol(FnName, TLI.getPointerTy());
TargetLowering::ArgListTy Args;
@ -2126,7 +2159,12 @@ ExpandIntToFP(bool isSigned, MVT::ValueType DestTy, SDOperand Source) {
// node as our input and ignore the output chain. This allows us to place
// calls wherever we need them to satisfy data dependences.
const Type *RetTy = MVT::getTypeForValueType(DestTy);
return TLI.LowerCallTo(InChain, RetTy, false, Callee, Args, DAG).first;
std::pair<SDOperand,SDOperand> CallResult =
TLI.LowerCallTo(InChain, RetTy, false, Callee, Args, DAG);
SpliceCallInto(CallResult.second, OutChain, DAG);
return CallResult.first;
}