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Instead of awkwardly encoding calling-convention information with ISD::CALL, ISD::FORMAL_ARGUMENTS, ISD::RET, and ISD::ARG_FLAGS nodes, TargetLowering provides three virtual functions for targets to override: LowerFormalArguments, LowerCall, and LowerRet, which replace the custom lowering done on the special nodes. They provide the same information, but in a more immediately usable format. This also reworks much of the target-independent tail call logic. The decision of whether or not to perform a tail call is now cleanly split between target-independent portions, and the target dependent portion in IsEligibleForTailCallOptimization. This also synchronizes all in-tree targets, to help enable future refactoring and feature work. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78142 91177308-0d34-0410-b5e6-96231b3b80d8
456 lines
21 KiB
C++
456 lines
21 KiB
C++
//===-- PPCISelLowering.h - PPC32 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 PPC 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_POWERPC_PPC32ISELLOWERING_H
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#define LLVM_TARGET_POWERPC_PPC32ISELLOWERING_H
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "PPC.h"
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#include "PPCSubtarget.h"
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namespace llvm {
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namespace PPCISD {
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enum NodeType {
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// Start the numbering where the builtin ops and target ops leave off.
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FIRST_NUMBER = ISD::BUILTIN_OP_END,
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/// FSEL - Traditional three-operand fsel node.
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///
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FSEL,
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/// FCFID - The FCFID instruction, taking an f64 operand and producing
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/// and f64 value containing the FP representation of the integer that
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/// was temporarily in the f64 operand.
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FCFID,
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/// FCTI[D,W]Z - The FCTIDZ and FCTIWZ instructions, taking an f32 or f64
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/// operand, producing an f64 value containing the integer representation
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/// of that FP value.
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FCTIDZ, FCTIWZ,
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/// STFIWX - The STFIWX instruction. The first operand is an input token
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/// chain, then an f64 value to store, then an address to store it to,
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/// then a SRCVALUE for the address.
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STFIWX,
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// VMADDFP, VNMSUBFP - The VMADDFP and VNMSUBFP instructions, taking
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// three v4f32 operands and producing a v4f32 result.
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VMADDFP, VNMSUBFP,
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/// VPERM - The PPC VPERM Instruction.
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///
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VPERM,
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/// Hi/Lo - These represent the high and low 16-bit parts of a global
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/// address respectively. These nodes have two operands, the first of
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/// which must be a TargetGlobalAddress, and the second of which must be a
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/// Constant. Selected naively, these turn into 'lis G+C' and 'li G+C',
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/// though these are usually folded into other nodes.
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Hi, Lo,
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/// OPRC, CHAIN = DYNALLOC(CHAIN, NEGSIZE, FRAME_INDEX)
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/// This instruction is lowered in PPCRegisterInfo::eliminateFrameIndex to
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/// compute an allocation on the stack.
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DYNALLOC,
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/// GlobalBaseReg - On Darwin, this node represents the result of the mflr
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/// at function entry, used for PIC code.
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GlobalBaseReg,
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/// These nodes represent the 32-bit PPC shifts that operate on 6-bit
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/// shift amounts. These nodes are generated by the multi-precision shift
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/// code.
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SRL, SRA, SHL,
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/// EXTSW_32 - This is the EXTSW instruction for use with "32-bit"
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/// registers.
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EXTSW_32,
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/// STD_32 - This is the STD instruction for use with "32-bit" registers.
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STD_32,
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/// CALL - A direct function call.
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CALL_Darwin, CALL_SVR4,
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/// CHAIN,FLAG = MTCTR(VAL, CHAIN[, INFLAG]) - Directly corresponds to a
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/// MTCTR instruction.
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MTCTR,
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/// CHAIN,FLAG = BCTRL(CHAIN, INFLAG) - Directly corresponds to a
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/// BCTRL instruction.
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BCTRL_Darwin, BCTRL_SVR4,
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/// Return with a flag operand, matched by 'blr'
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RET_FLAG,
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/// R32 = MFCR(CRREG, INFLAG) - Represents the MFCR/MFOCRF instructions.
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/// This copies the bits corresponding to the specified CRREG into the
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/// resultant GPR. Bits corresponding to other CR regs are undefined.
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MFCR,
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/// RESVEC = VCMP(LHS, RHS, OPC) - Represents one of the altivec VCMP*
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/// instructions. For lack of better number, we use the opcode number
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/// encoding for the OPC field to identify the compare. For example, 838
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/// is VCMPGTSH.
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VCMP,
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/// RESVEC, OUTFLAG = VCMPo(LHS, RHS, OPC) - Represents one of the
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/// altivec VCMP*o instructions. For lack of better number, we use the
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/// opcode number encoding for the OPC field to identify the compare. For
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/// example, 838 is VCMPGTSH.
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VCMPo,
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/// CHAIN = COND_BRANCH CHAIN, CRRC, OPC, DESTBB [, INFLAG] - This
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/// corresponds to the COND_BRANCH pseudo instruction. CRRC is the
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/// condition register to branch on, OPC is the branch opcode to use (e.g.
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/// PPC::BLE), DESTBB is the destination block to branch to, and INFLAG is
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/// an optional input flag argument.
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COND_BRANCH,
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/// CHAIN = STBRX CHAIN, GPRC, Ptr, SRCVALUE, Type - This is a
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/// byte-swapping store instruction. It byte-swaps the low "Type" bits of
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/// the GPRC input, then stores it through Ptr. Type can be either i16 or
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/// i32.
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STBRX,
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/// GPRC, CHAIN = LBRX CHAIN, Ptr, SRCVALUE, Type - This is a
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/// byte-swapping load instruction. It loads "Type" bits, byte swaps it,
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/// then puts it in the bottom bits of the GPRC. TYPE can be either i16
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/// or i32.
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LBRX,
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// The following 5 instructions are used only as part of the
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// long double-to-int conversion sequence.
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/// OUTFLAG = MFFS F8RC - This moves the FPSCR (not modelled) into the
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/// register.
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MFFS,
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/// OUTFLAG = MTFSB0 INFLAG - This clears a bit in the FPSCR.
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MTFSB0,
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/// OUTFLAG = MTFSB1 INFLAG - This sets a bit in the FPSCR.
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MTFSB1,
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/// F8RC, OUTFLAG = FADDRTZ F8RC, F8RC, INFLAG - This is an FADD done with
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/// rounding towards zero. It has flags added so it won't move past the
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/// FPSCR-setting instructions.
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FADDRTZ,
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/// MTFSF = F8RC, INFLAG - This moves the register into the FPSCR.
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MTFSF,
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/// LARX = This corresponds to PPC l{w|d}arx instrcution: load and
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/// reserve indexed. This is used to implement atomic operations.
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LARX,
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/// STCX = This corresponds to PPC stcx. instrcution: store conditional
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/// indexed. This is used to implement atomic operations.
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STCX,
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/// TC_RETURN - A tail call return.
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/// operand #0 chain
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/// operand #1 callee (register or absolute)
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/// operand #2 stack adjustment
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/// operand #3 optional in flag
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TC_RETURN
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};
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}
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/// Define some predicates that are used for node matching.
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namespace PPC {
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/// isVPKUHUMShuffleMask - Return true if this is the shuffle mask for a
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/// VPKUHUM instruction.
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bool isVPKUHUMShuffleMask(ShuffleVectorSDNode *N, bool isUnary);
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/// isVPKUWUMShuffleMask - Return true if this is the shuffle mask for a
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/// VPKUWUM instruction.
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bool isVPKUWUMShuffleMask(ShuffleVectorSDNode *N, bool isUnary);
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/// isVMRGLShuffleMask - Return true if this is a shuffle mask suitable for
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/// a VRGL* instruction with the specified unit size (1,2 or 4 bytes).
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bool isVMRGLShuffleMask(ShuffleVectorSDNode *N, unsigned UnitSize,
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bool isUnary);
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/// isVMRGHShuffleMask - Return true if this is a shuffle mask suitable for
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/// a VRGH* instruction with the specified unit size (1,2 or 4 bytes).
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bool isVMRGHShuffleMask(ShuffleVectorSDNode *N, unsigned UnitSize,
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bool isUnary);
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/// isVSLDOIShuffleMask - If this is a vsldoi shuffle mask, return the shift
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/// amount, otherwise return -1.
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int isVSLDOIShuffleMask(SDNode *N, bool isUnary);
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/// isSplatShuffleMask - Return true if the specified VECTOR_SHUFFLE operand
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/// specifies a splat of a single element that is suitable for input to
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/// VSPLTB/VSPLTH/VSPLTW.
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bool isSplatShuffleMask(ShuffleVectorSDNode *N, unsigned EltSize);
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/// isAllNegativeZeroVector - Returns true if all elements of build_vector
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/// are -0.0.
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bool isAllNegativeZeroVector(SDNode *N);
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/// getVSPLTImmediate - Return the appropriate VSPLT* immediate to splat the
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/// specified isSplatShuffleMask VECTOR_SHUFFLE mask.
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unsigned getVSPLTImmediate(SDNode *N, unsigned EltSize);
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/// get_VSPLTI_elt - If this is a build_vector of constants which can be
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/// formed by using a vspltis[bhw] instruction of the specified element
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/// size, return the constant being splatted. The ByteSize field indicates
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/// the number of bytes of each element [124] -> [bhw].
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SDValue get_VSPLTI_elt(SDNode *N, unsigned ByteSize, SelectionDAG &DAG);
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}
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class PPCTargetLowering : public TargetLowering {
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int VarArgsFrameIndex; // FrameIndex for start of varargs area.
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int VarArgsStackOffset; // StackOffset for start of stack
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// arguments.
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unsigned VarArgsNumGPR; // Index of the first unused integer
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// register for parameter passing.
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unsigned VarArgsNumFPR; // Index of the first unused double
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// register for parameter passing.
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const PPCSubtarget &PPCSubTarget;
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public:
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explicit PPCTargetLowering(PPCTargetMachine &TM);
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/// getTargetNodeName() - This method returns the name of a target specific
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/// DAG node.
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virtual const char *getTargetNodeName(unsigned Opcode) const;
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/// getSetCCResultType - Return the ISD::SETCC ValueType
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virtual MVT getSetCCResultType(MVT VT) const;
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/// getPreIndexedAddressParts - returns true by value, base pointer and
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/// offset pointer and addressing mode by reference if the node's address
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/// can be legally represented as pre-indexed load / store address.
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virtual bool getPreIndexedAddressParts(SDNode *N, SDValue &Base,
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SDValue &Offset,
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ISD::MemIndexedMode &AM,
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SelectionDAG &DAG) const;
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/// SelectAddressRegReg - Given the specified addressed, check to see if it
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/// can be represented as an indexed [r+r] operation. Returns false if it
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/// can be more efficiently represented with [r+imm].
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bool SelectAddressRegReg(SDValue N, SDValue &Base, SDValue &Index,
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SelectionDAG &DAG) const;
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/// SelectAddressRegImm - Returns true if the address N can be represented
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/// by a base register plus a signed 16-bit displacement [r+imm], and if it
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/// is not better represented as reg+reg.
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bool SelectAddressRegImm(SDValue N, SDValue &Disp, SDValue &Base,
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SelectionDAG &DAG) const;
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/// SelectAddressRegRegOnly - Given the specified addressed, force it to be
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/// represented as an indexed [r+r] operation.
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bool SelectAddressRegRegOnly(SDValue N, SDValue &Base, SDValue &Index,
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SelectionDAG &DAG) const;
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/// SelectAddressRegImmShift - Returns true if the address N can be
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/// represented by a base register plus a signed 14-bit displacement
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/// [r+imm*4]. Suitable for use by STD and friends.
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bool SelectAddressRegImmShift(SDValue N, SDValue &Disp, SDValue &Base,
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SelectionDAG &DAG) const;
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/// LowerOperation - Provide custom lowering hooks for some operations.
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///
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virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
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/// ReplaceNodeResults - Replace the results of node with an illegal result
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/// type with new values built out of custom code.
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///
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virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
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SelectionDAG &DAG);
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virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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virtual void computeMaskedBitsForTargetNode(const SDValue Op,
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const APInt &Mask,
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APInt &KnownZero,
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APInt &KnownOne,
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const SelectionDAG &DAG,
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unsigned Depth = 0) const;
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virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
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MachineBasicBlock *MBB) const;
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MachineBasicBlock *EmitAtomicBinary(MachineInstr *MI,
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MachineBasicBlock *MBB, bool is64Bit,
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unsigned BinOpcode) const;
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MachineBasicBlock *EmitPartwordAtomicBinary(MachineInstr *MI,
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MachineBasicBlock *MBB,
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bool is8bit, unsigned Opcode) const;
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ConstraintType getConstraintType(const std::string &Constraint) const;
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std::pair<unsigned, const TargetRegisterClass*>
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getRegForInlineAsmConstraint(const std::string &Constraint,
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MVT VT) const;
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/// getByValTypeAlignment - Return the desired alignment for ByVal aggregate
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/// function arguments in the caller parameter area. This is the actual
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/// alignment, not its logarithm.
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unsigned getByValTypeAlignment(const Type *Ty) const;
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/// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
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/// vector. If it is invalid, don't add anything to Ops. If hasMemory is
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/// true it means one of the asm constraint of the inline asm instruction
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/// being processed is 'm'.
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virtual void LowerAsmOperandForConstraint(SDValue Op,
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char ConstraintLetter,
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bool hasMemory,
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std::vector<SDValue> &Ops,
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SelectionDAG &DAG) const;
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/// isLegalAddressingMode - Return true if the addressing mode represented
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/// by AM is legal for this target, for a load/store of the specified type.
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virtual bool isLegalAddressingMode(const AddrMode &AM, const Type *Ty)const;
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/// isLegalAddressImmediate - Return true if the integer value can be used
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/// as the offset of the target addressing mode for load / store of the
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/// given type.
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virtual bool isLegalAddressImmediate(int64_t V, const Type *Ty) const;
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/// isLegalAddressImmediate - Return true if the GlobalValue can be used as
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/// the offset of the target addressing mode.
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virtual bool isLegalAddressImmediate(GlobalValue *GV) const;
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virtual bool
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IsEligibleForTailCallOptimization(SDValue Callee,
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unsigned CalleeCC,
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bool isVarArg,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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SelectionDAG& DAG) const;
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virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
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virtual MVT getOptimalMemOpType(uint64_t Size, unsigned Align,
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bool isSrcConst, bool isSrcStr,
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SelectionDAG &DAG) const;
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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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private:
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SDValue getFramePointerFrameIndex(SelectionDAG & DAG) const;
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SDValue getReturnAddrFrameIndex(SelectionDAG & DAG) const;
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SDValue EmitTailCallLoadFPAndRetAddr(SelectionDAG & DAG,
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int SPDiff,
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SDValue Chain,
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SDValue &LROpOut,
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SDValue &FPOpOut,
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bool isDarwinABI,
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DebugLoc dl);
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SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG);
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SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG);
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SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG);
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SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);
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SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG);
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SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG);
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SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG);
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SDValue LowerTRAMPOLINE(SDValue Op, SelectionDAG &DAG);
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SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG,
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int VarArgsFrameIndex, int VarArgsStackOffset,
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unsigned VarArgsNumGPR, unsigned VarArgsNumFPR,
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const PPCSubtarget &Subtarget);
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SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG, int VarArgsFrameIndex,
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int VarArgsStackOffset, unsigned VarArgsNumGPR,
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unsigned VarArgsNumFPR, const PPCSubtarget &Subtarget);
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SDValue LowerSTACKRESTORE(SDValue Op, SelectionDAG &DAG,
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const PPCSubtarget &Subtarget);
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SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG,
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const PPCSubtarget &Subtarget);
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SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
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SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG, DebugLoc dl);
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SDValue LowerSINT_TO_FP(SDValue Op, SelectionDAG &DAG);
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SDValue LowerFLT_ROUNDS_(SDValue Op, SelectionDAG &DAG);
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SDValue LowerSHL_PARTS(SDValue Op, SelectionDAG &DAG);
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SDValue LowerSRL_PARTS(SDValue Op, SelectionDAG &DAG);
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SDValue LowerSRA_PARTS(SDValue Op, SelectionDAG &DAG);
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SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG);
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SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG);
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SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG);
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SDValue LowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG);
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SDValue LowerMUL(SDValue Op, SelectionDAG &DAG);
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SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
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unsigned CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals);
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SDValue FinishCall(unsigned CallConv, DebugLoc dl, bool isTailCall,
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bool isVarArg,
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SelectionDAG &DAG,
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SmallVector<std::pair<unsigned, SDValue>, 8>
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&RegsToPass,
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SDValue InFlag, SDValue Chain,
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SDValue &Callee,
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int SPDiff, unsigned NumBytes,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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SmallVectorImpl<SDValue> &InVals);
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virtual SDValue
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LowerFormalArguments(SDValue Chain,
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unsigned CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals);
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virtual SDValue
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LowerCall(SDValue Chain, SDValue Callee,
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unsigned CallConv, bool isVarArg, bool isTailCall,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals);
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virtual SDValue
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LowerReturn(SDValue Chain,
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unsigned CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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DebugLoc dl, SelectionDAG &DAG);
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SDValue
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LowerFormalArguments_Darwin(SDValue Chain,
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unsigned CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals);
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SDValue
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LowerFormalArguments_SVR4(SDValue Chain,
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unsigned CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals);
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|
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SDValue
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LowerCall_Darwin(SDValue Chain, SDValue Callee,
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unsigned CallConv, bool isVarArg, bool isTailCall,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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|
const SmallVectorImpl<ISD::InputArg> &Ins,
|
|
DebugLoc dl, SelectionDAG &DAG,
|
|
SmallVectorImpl<SDValue> &InVals);
|
|
SDValue
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LowerCall_SVR4(SDValue Chain, SDValue Callee,
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|
unsigned CallConv, bool isVarArg, bool isTailCall,
|
|
const SmallVectorImpl<ISD::OutputArg> &Outs,
|
|
const SmallVectorImpl<ISD::InputArg> &Ins,
|
|
DebugLoc dl, SelectionDAG &DAG,
|
|
SmallVectorImpl<SDValue> &InVals);
|
|
};
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}
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|
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#endif // LLVM_TARGET_POWERPC_PPC32ISELLOWERING_H
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