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[SystemZ] Add basic prefetch support

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Just the instructions and intrinsics for now.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189100 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Sandiford
2013-08-23 11:36:42 +00:00
parent 35c93e4e42
commit a550b51bac
12 changed files with 312 additions and 5 deletions
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26
lib/Target/SystemZ/SystemZISelLowering.cpp
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@@ -194,6 +194,9 @@ SystemZTargetLowering::SystemZTargetLowering(SystemZTargetMachine &tm)
setOperationAction(ISD::STACKSAVE, MVT::Other, Custom);
setOperationAction(ISD::STACKRESTORE, MVT::Other, Custom);
// Handle prefetches with PFD or PFDRL.
setOperationAction(ISD::PREFETCH, MVT::Other, Custom);
// Handle floating-point types.
for (unsigned I = MVT::FIRST_FP_VALUETYPE;
I <= MVT::LAST_FP_VALUETYPE;
@@ -1806,6 +1809,26 @@ SDValue SystemZTargetLowering::lowerSTACKRESTORE(SDValue Op,
SystemZ::R15D, Op.getOperand(1));
}
SDValue SystemZTargetLowering::lowerPREFETCH(SDValue Op,
SelectionDAG &DAG) const {
bool IsData = cast<ConstantSDNode>(Op.getOperand(4))->getZExtValue();
if (!IsData)
// Just preserve the chain.
return Op.getOperand(0);
bool IsWrite = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue();
unsigned Code = IsWrite ? SystemZ::PFD_WRITE : SystemZ::PFD_READ;
MemIntrinsicSDNode *Node = cast<MemIntrinsicSDNode>(Op.getNode());
SDValue Ops[] = {
Op.getOperand(0),
DAG.getConstant(Code, MVT::i32),
Op.getOperand(1)
};
return DAG.getMemIntrinsicNode(SystemZISD::PREFETCH, SDLoc(Op),
Node->getVTList(), Ops, array_lengthof(Ops),
Node->getMemoryVT(), Node->getMemOperand());
}
SDValue SystemZTargetLowering::LowerOperation(SDValue Op,
SelectionDAG &DAG) const {
switch (Op.getOpcode()) {
@@ -1869,6 +1892,8 @@ SDValue SystemZTargetLowering::LowerOperation(SDValue Op,
return lowerSTACKSAVE(Op, DAG);
case ISD::STACKRESTORE:
return lowerSTACKRESTORE(Op, DAG);
case ISD::PREFETCH:
return lowerPREFETCH(Op, DAG);
default:
llvm_unreachable("Unexpected node to lower");
}
@@ -1909,6 +1934,7 @@ const char *SystemZTargetLowering::getTargetNodeName(unsigned Opcode) const {
OPCODE(ATOMIC_LOADW_UMIN);
OPCODE(ATOMIC_LOADW_UMAX);
OPCODE(ATOMIC_CMP_SWAPW);
OPCODE(PREFETCH);
}
return NULL;
#undef OPCODE