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give X86ISD::FNSTCW16m a memoperand, since it touches memory. It only

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can access the stack due to how it is generated though.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114522 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-09-22 01:11:26 +00:00
parent 0729093cd7
commit 2156b79c49
3 changed files with 21 additions and 16 deletions
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1
lib/Target/X86/X86ISelDAGToDAG.cpp
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@ -1169,7 +1169,6 @@ bool X86DAGToDAGISel::SelectAddr(SDNode *Parent, SDValue N, SDValue &Base,
Parent->getOpcode() != ISD::PREFETCH &&
Parent->getOpcode() != ISD::INTRINSIC_W_CHAIN && // unaligned loads, fixme
Parent->getOpcode() != ISD::INTRINSIC_VOID && // nontemporal stores.
Parent->getOpcode() != X86ISD::FNSTCW16m &&
Parent->getOpcode() != X86ISD::FLD &&
Parent->getOpcode() != X86ISD::FILD &&
Parent->getOpcode() != X86ISD::FILD_FLAG &&

31
lib/Target/X86/X86ISelLowering.cpp
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@ -8158,41 +8158,48 @@ SDValue X86TargetLowering::LowerFLT_ROUNDS_(SDValue Op,
const TargetFrameInfo &TFI = *TM.getFrameInfo();
unsigned StackAlignment = TFI.getStackAlignment();
EVT VT = Op.getValueType();
DebugLoc dl = Op.getDebugLoc();
DebugLoc DL = Op.getDebugLoc();
// Save FP Control Word to stack slot
int SSFI = MF.getFrameInfo()->CreateStackObject(2, StackAlignment, false);
SDValue StackSlot = DAG.getFrameIndex(SSFI, getPointerTy());
SDValue Chain = DAG.getNode(X86ISD::FNSTCW16m, dl, MVT::Other,
DAG.getEntryNode(), StackSlot);
MachineMemOperand *MMO =
MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(SSFI),
MachineMemOperand::MOStore, 2, 2);
SDValue Ops[] = { DAG.getEntryNode(), StackSlot };
SDValue Chain = DAG.getMemIntrinsicNode(X86ISD::FNSTCW16m, DL,
DAG.getVTList(MVT::Other),
Ops, 2, MVT::i16, MMO);
// Load FP Control Word from stack slot
SDValue CWD = DAG.getLoad(MVT::i16, dl, Chain, StackSlot,
SDValue CWD = DAG.getLoad(MVT::i16, DL, Chain, StackSlot,
MachinePointerInfo(), false, false, 0);
// Transform as necessary
SDValue CWD1 =
DAG.getNode(ISD::SRL, dl, MVT::i16,
DAG.getNode(ISD::AND, dl, MVT::i16,
DAG.getNode(ISD::SRL, DL, MVT::i16,
DAG.getNode(ISD::AND, DL, MVT::i16,
CWD, DAG.getConstant(0x800, MVT::i16)),
DAG.getConstant(11, MVT::i8));
SDValue CWD2 =
DAG.getNode(ISD::SRL, dl, MVT::i16,
DAG.getNode(ISD::AND, dl, MVT::i16,
DAG.getNode(ISD::SRL, DL, MVT::i16,
DAG.getNode(ISD::AND, DL, MVT::i16,
CWD, DAG.getConstant(0x400, MVT::i16)),
DAG.getConstant(9, MVT::i8));
SDValue RetVal =
DAG.getNode(ISD::AND, dl, MVT::i16,
DAG.getNode(ISD::ADD, dl, MVT::i16,
DAG.getNode(ISD::OR, dl, MVT::i16, CWD1, CWD2),
DAG.getNode(ISD::AND, DL, MVT::i16,
DAG.getNode(ISD::ADD, DL, MVT::i16,
DAG.getNode(ISD::OR, DL, MVT::i16, CWD1, CWD2),
DAG.getConstant(1, MVT::i16)),
DAG.getConstant(3, MVT::i16));
return DAG.getNode((VT.getSizeInBits() < 16 ?
ISD::TRUNCATE : ISD::ZERO_EXTEND), dl, VT, RetVal);
ISD::TRUNCATE : ISD::ZERO_EXTEND), DL, VT, RetVal);
}
SDValue X86TargetLowering::LowerCTLZ(SDValue Op, SelectionDAG &DAG) const {

5
lib/Target/X86/X86ISelLowering.h
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@ -205,9 +205,6 @@ namespace llvm {
/// operand #3 optional in flag
TC_RETURN,
// FNSTCW16m - Store FP control world into i16 memory.
FNSTCW16m,
// VZEXT_MOVL - Vector move low and zero extend.
VZEXT_MOVL,
@ -302,6 +299,8 @@ namespace llvm {
// VZEXT_LOAD - Load, scalar_to_vector, and zero extend.
VZEXT_LOAD,
// FNSTCW16m - Store FP control world into i16 memory.
FNSTCW16m,
/// FP_TO_INT*_IN_MEM - This instruction implements FP_TO_SINT with the
/// integer destination in memory and a FP reg source. This corresponds