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propagate IR-level fast-math-flags to DAG nodes; 2nd try; NFC

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This is a less ambitious version of:
http://reviews.llvm.org/rL236546

because that was reverted in:
http://reviews.llvm.org/rL236600

because it caused memory corruption that wasn't related to FMF
but was actually due to making nodes with 2 operands derive from a
plain SDNode rather than a BinarySDNode. 

This patch adds the minimum plumbing necessary to use IR-level
fast-math-flags (FMF) in the backend without actually using
them for anything yet. This is a follow-on to:
http://reviews.llvm.org/rL235997

...which split the existing nsw / nuw / exact flags and FMF
into their own struct.
 



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237046 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel 2015-05-11 21:07:09 +00:00
parent 383c55870e
commit f6548b86b6
6 changed files with 67 additions and 59 deletions
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9
include/llvm/CodeGen/SelectionDAG.h
View File

@ -665,7 +665,7 @@ public:
SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT);
SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N);
SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1, SDValue N2,
bool nuw = false, bool nsw = false, bool exact = false);
const SDNodeFlags *Flags = nullptr);
SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1, SDValue N2,
SDValue N3);
SDValue getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1, SDValue N2,
@ -982,8 +982,7 @@ public:
/// Get the specified node if it's already available, or else return NULL.
SDNode *getNodeIfExists(unsigned Opcode, SDVTList VTs, ArrayRef<SDValue> Ops,
bool nuw = false, bool nsw = false,
bool exact = false);
const SDNodeFlags *Flags = nullptr);
/// Creates a SDDbgValue node.
SDDbgValue *getDbgValue(MDNode *Var, MDNode *Expr, SDNode *N, unsigned R,
@ -1241,8 +1240,8 @@ private:
void allnodes_clear();
BinarySDNode *GetBinarySDNode(unsigned Opcode, SDLoc DL, SDVTList VTs,
SDValue N1, SDValue N2, bool nuw, bool nsw,
bool exact);
SDValue N1, SDValue N2,
const SDNodeFlags *Flags = nullptr);
/// List of non-single value types.
FoldingSet<SDVTListNode> VTListMap;

9
include/llvm/CodeGen/SelectionDAGNodes.h
View File

@ -1017,6 +1017,11 @@ static bool isBinOpWithFlags(unsigned Opcode) {
case ISD::ADD:
case ISD::SUB:
case ISD::SHL:
case ISD::FADD:
case ISD::FDIV:
case ISD::FMUL:
case ISD::FREM:
case ISD::FSUB:
return true;
default:
return false;
@ -1029,8 +1034,8 @@ class BinaryWithFlagsSDNode : public BinarySDNode {
public:
SDNodeFlags Flags;
BinaryWithFlagsSDNode(unsigned Opc, unsigned Order, DebugLoc dl, SDVTList VTs,
SDValue X, SDValue Y)
: BinarySDNode(Opc, Order, dl, VTs, X, Y), Flags() {}
SDValue X, SDValue Y, const SDNodeFlags &NodeFlags)
: BinarySDNode(Opc, Order, dl, VTs, X, Y), Flags(NodeFlags) {}
static bool classof(const SDNode *N) {
return isBinOpWithFlags(N->getOpcode());
}

7
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
View File

@ -1452,12 +1452,9 @@ SDValue DAGCombiner::combine(SDNode *N) {
if (isa<ConstantSDNode>(N0) || !isa<ConstantSDNode>(N1)) {
SDValue Ops[] = {N1, N0};
SDNode *CSENode;
if (const BinaryWithFlagsSDNode *BinNode =
dyn_cast<BinaryWithFlagsSDNode>(N)) {
if (const auto *BinNode = dyn_cast<BinaryWithFlagsSDNode>(N)) {
CSENode = DAG.getNodeIfExists(N->getOpcode(), N->getVTList(), Ops,
BinNode->Flags.hasNoUnsignedWrap(),
BinNode->Flags.hasNoSignedWrap(),
BinNode->Flags.hasExact());
&BinNode->Flags);
} else {
CSENode = DAG.getNodeIfExists(N->getOpcode(), N->getVTList(), Ops);
}

72
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -399,19 +399,22 @@ static void AddNodeIDOperands(FoldingSetNodeID &ID,
ID.AddInteger(Op.getResNo());
}
}
static void AddBinaryNodeIDCustom(FoldingSetNodeID &ID, bool nuw, bool nsw,
bool exact) {
ID.AddBoolean(nuw);
ID.AddBoolean(nsw);
ID.AddBoolean(exact);
/// Add logical or fast math flag values to FoldingSetNodeID value.
static void AddNodeIDFlags(FoldingSetNodeID &ID, unsigned Opcode,
const SDNodeFlags *Flags) {
if (!Flags || !isBinOpWithFlags(Opcode))
return;
unsigned RawFlags = Flags->getRawFlags();
// If no flags are set, do not alter the ID. This saves time and allows
// a gradual increase in API usage of the optional optimization flags.
if (RawFlags != 0)
ID.AddInteger(RawFlags);
}
/// AddBinaryNodeIDCustom - Add BinarySDNodes special infos
static void AddBinaryNodeIDCustom(FoldingSetNodeID &ID, unsigned Opcode,
bool nuw, bool nsw, bool exact) {
if (isBinOpWithFlags(Opcode))
AddBinaryNodeIDCustom(ID, nuw, nsw, exact);
static void AddNodeIDFlags(FoldingSetNodeID &ID, const SDNode *N) {
if (auto *Node = dyn_cast<BinaryWithFlagsSDNode>(N))
AddNodeIDFlags(ID, Node->getOpcode(), &Node->Flags);
}
static void AddNodeIDNode(FoldingSetNodeID &ID, unsigned short OpC,
@ -506,20 +509,6 @@ static void AddNodeIDCustom(FoldingSetNodeID &ID, const SDNode *N) {
ID.AddInteger(ST->getPointerInfo().getAddrSpace());
break;
}
case ISD::SDIV:
case ISD::UDIV:
case ISD::SRA:
case ISD::SRL:
case ISD::MUL:
case ISD::ADD:
case ISD::SUB:
case ISD::SHL: {
const BinaryWithFlagsSDNode *BinNode = cast<BinaryWithFlagsSDNode>(N);
AddBinaryNodeIDCustom(
ID, N->getOpcode(), BinNode->Flags.hasNoUnsignedWrap(),
BinNode->Flags.hasNoSignedWrap(), BinNode->Flags.hasExact());
break;
}
case ISD::ATOMIC_CMP_SWAP:
case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS:
case ISD::ATOMIC_SWAP:
@ -563,6 +552,8 @@ static void AddNodeIDCustom(FoldingSetNodeID &ID, const SDNode *N) {
}
} // end switch (N->getOpcode())
AddNodeIDFlags(ID, N);
// Target specific memory nodes could also have address spaces to check.
if (N->isTargetMemoryOpcode())
ID.AddInteger(cast<MemSDNode>(N)->getPointerInfo().getAddrSpace());
@ -959,14 +950,16 @@ void SelectionDAG::allnodes_clear() {
BinarySDNode *SelectionDAG::GetBinarySDNode(unsigned Opcode, SDLoc DL,
SDVTList VTs, SDValue N1,
SDValue N2, bool nuw, bool nsw,
bool exact) {
SDValue N2,
const SDNodeFlags *Flags) {
if (isBinOpWithFlags(Opcode)) {
// If no flags were passed in, use a default flags object.
SDNodeFlags F;
if (Flags == nullptr)
Flags = &F;
BinaryWithFlagsSDNode *FN = new (NodeAllocator) BinaryWithFlagsSDNode(
Opcode, DL.getIROrder(), DL.getDebugLoc(), VTs, N1, N2);
FN->Flags.setNoUnsignedWrap(nuw);
FN->Flags.setNoSignedWrap(nsw);
FN->Flags.setExact(exact);
Opcode, DL.getIROrder(), DL.getDebugLoc(), VTs, N1, N2, *Flags);
return FN;
}
@ -3201,7 +3194,7 @@ SDValue SelectionDAG::FoldConstantArithmetic(unsigned Opcode, SDLoc DL, EVT VT,
}
SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1,
SDValue N2, bool nuw, bool nsw, bool exact) {
SDValue N2, const SDNodeFlags *Flags) {
ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode());
switch (Opcode) {
@ -3665,22 +3658,20 @@ SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1,
// Memoize this node if possible.
BinarySDNode *N;
SDVTList VTs = getVTList(VT);
const bool BinOpHasFlags = isBinOpWithFlags(Opcode);
if (VT != MVT::Glue) {
SDValue Ops[] = {N1, N2};
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opcode, VTs, Ops);
if (BinOpHasFlags)
AddBinaryNodeIDCustom(ID, Opcode, nuw, nsw, exact);
AddNodeIDFlags(ID, Opcode, Flags);
void *IP = nullptr;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDValue(E, 0);
N = GetBinarySDNode(Opcode, DL, VTs, N1, N2, nuw, nsw, exact);
N = GetBinarySDNode(Opcode, DL, VTs, N1, N2, Flags);
CSEMap.InsertNode(N, IP);
} else {
N = GetBinarySDNode(Opcode, DL, VTs, N1, N2, nuw, nsw, exact);
N = GetBinarySDNode(Opcode, DL, VTs, N1, N2, Flags);
}
InsertNode(N);
@ -5984,13 +5975,12 @@ SelectionDAG::getTargetInsertSubreg(int SRIdx, SDLoc DL, EVT VT,
/// getNodeIfExists - Get the specified node if it's already available, or
/// else return NULL.
SDNode *SelectionDAG::getNodeIfExists(unsigned Opcode, SDVTList VTList,
ArrayRef<SDValue> Ops, bool nuw, bool nsw,
bool exact) {
ArrayRef<SDValue> Ops,
const SDNodeFlags *Flags) {
if (VTList.VTs[VTList.NumVTs - 1] != MVT::Glue) {
FoldingSetNodeID ID;
AddNodeIDNode(ID, Opcode, VTList, Ops);
if (isBinOpWithFlags(Opcode))
AddBinaryNodeIDCustom(ID, nuw, nsw, exact);
AddNodeIDFlags(ID, Opcode, Flags);
void *IP = nullptr;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return E;

24
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
View File

@ -2139,6 +2139,8 @@ void SelectionDAGBuilder::visitBinary(const User &I, unsigned OpCode) {
bool nuw = false;
bool nsw = false;
bool exact = false;
FastMathFlags FMF;
if (const OverflowingBinaryOperator *OFBinOp =
dyn_cast<const OverflowingBinaryOperator>(&I)) {
nuw = OFBinOp->hasNoUnsignedWrap();
@ -2147,9 +2149,20 @@ void SelectionDAGBuilder::visitBinary(const User &I, unsigned OpCode) {
if (const PossiblyExactOperator *ExactOp =
dyn_cast<const PossiblyExactOperator>(&I))
exact = ExactOp->isExact();
if (const FPMathOperator *FPOp = dyn_cast<const FPMathOperator>(&I))
FMF = FPOp->getFastMathFlags();
SDNodeFlags Flags;
Flags.setExact(exact);
Flags.setNoSignedWrap(nsw);
Flags.setNoUnsignedWrap(nuw);
Flags.setAllowReciprocal(FMF.allowReciprocal());
Flags.setNoInfs(FMF.noInfs());
Flags.setNoNaNs(FMF.noNaNs());
Flags.setNoSignedZeros(FMF.noSignedZeros());
Flags.setUnsafeAlgebra(FMF.unsafeAlgebra());
SDValue BinNodeValue = DAG.getNode(OpCode, getCurSDLoc(), Op1.getValueType(),
Op1, Op2, nuw, nsw, exact);
Op1, Op2, &Flags);
setValue(&I, BinNodeValue);
}
@ -2197,9 +2210,12 @@ void SelectionDAGBuilder::visitShift(const User &I, unsigned Opcode) {
dyn_cast<const PossiblyExactOperator>(&I))
exact = ExactOp->isExact();
}
SDNodeFlags Flags;
Flags.setExact(exact);
Flags.setNoSignedWrap(nsw);
Flags.setNoUnsignedWrap(nuw);
SDValue Res = DAG.getNode(Opcode, getCurSDLoc(), Op1.getValueType(), Op1, Op2,
nuw, nsw, exact);
&Flags);
setValue(&I, Res);
}

5
lib/CodeGen/SelectionDAG/TargetLowering.cpp
View File

@ -2660,8 +2660,9 @@ SDValue TargetLowering::BuildExactSDIV(SDValue Op1, SDValue Op2, SDLoc dl,
// TODO: For UDIV use SRL instead of SRA.
SDValue Amt =
DAG.getConstant(ShAmt, dl, getShiftAmountTy(Op1.getValueType()));
Op1 = DAG.getNode(ISD::SRA, dl, Op1.getValueType(), Op1, Amt, false, false,
true);
SDNodeFlags Flags;
Flags.setExact(true);
Op1 = DAG.getNode(ISD::SRA, dl, Op1.getValueType(), Op1, Amt, &Flags);
d = d.ashr(ShAmt);
}