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With the SVR4 ABI on PowerPC, vector arguments for vararg calls are passed differently depending on whether they are a fixed or a variable argument. Variable vector arguments always go into memory, fixed vector arguments are put into vector registers. If there are no free vector registers available, fixed vector arguments are put on the stack. The NumFixedArgs attribute allows to decide for an argument in a vararg call whether it belongs to the fixed or variable portion of the parameter list. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74764 91177308-0d34-0410-b5e6-96231b3b80d8
79 lines
2.9 KiB
C++
79 lines
2.9 KiB
C++
//===-- IA64ISelLowering.h - IA64 DAG Lowering Interface --------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the interfaces that IA64 uses to lower LLVM code into a
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// selection DAG.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_IA64_IA64ISELLOWERING_H
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#define LLVM_TARGET_IA64_IA64ISELLOWERING_H
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "IA64.h"
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namespace llvm {
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namespace IA64ISD {
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enum NodeType {
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// Start the numbering where the builting ops and target ops leave off.
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FIRST_NUMBER = ISD::BUILTIN_OP_END,
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/// GETFD - the getf.d instruction takes a floating point operand and
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/// returns its 64-bit memory representation as an i64
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GETFD,
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// TODO: explain this hack
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BRCALL,
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// RET_FLAG - Return with a flag operand
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RET_FLAG
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};
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}
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class IA64TargetLowering : public TargetLowering {
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int VarArgsFrameIndex; // FrameIndex for start of varargs area.
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//int ReturnAddrIndex; // FrameIndex for return slot.
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unsigned GP, SP, RP; // FIXME - clean this mess up
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public:
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explicit IA64TargetLowering(TargetMachine &TM);
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unsigned VirtGPR; // this is public so it can be accessed in the selector
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// for ISD::RET. add an accessor instead? FIXME
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const char *getTargetNodeName(unsigned Opcode) const;
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/// getSetCCResultType: return ISD::SETCC's result type.
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virtual MVT getSetCCResultType(MVT VT) const;
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/// LowerArguments - This hook must be implemented to indicate how we should
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/// lower the arguments for the specified function, into the specified DAG.
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virtual void LowerArguments(Function &F, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &ArgValues,
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DebugLoc dl);
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/// LowerCallTo - This hook lowers an abstract call to a function into an
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/// actual call.
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virtual std::pair<SDValue, SDValue>
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LowerCallTo(SDValue Chain, const Type *RetTy,
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bool RetSExt, bool RetZExt, bool isVarArg, bool isInreg,
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unsigned NumFixedArgs, unsigned CC, bool isTailCall,
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SDValue Callee, ArgListTy &Args, SelectionDAG &DAG,
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DebugLoc dl);
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/// LowerOperation - for custom lowering specific ops
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/// (currently, only "ret void")
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virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
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/// getFunctionAlignment - Return the Log2 alignment of this function.
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virtual unsigned getFunctionAlignment(const Function *F) const;
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};
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}
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#endif // LLVM_TARGET_IA64_IA64ISELLOWERING_H
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