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26c8dcc692
This allows us to keep passing reduced masks to SimplifyDemandedBits, but know about all the bits if SimplifyDemandedBits fails. This allows instcombine to simplify cases like the one in the included testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154011 91177308-0d34-0410-b5e6-96231b3b80d8
496 lines
22 KiB
C++
496 lines
22 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 "PPC.h"
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#include "PPCSubtarget.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/CodeGen/SelectionDAG.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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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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TOC_ENTRY,
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/// The following three target-specific nodes are used for calls through
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/// function pointers in the 64-bit SVR4 ABI.
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/// Restore the TOC from the TOC save area of the current stack frame.
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/// This is basically a hard coded load instruction which additionally
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/// takes/produces a flag.
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TOC_RESTORE,
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/// Like a regular LOAD but additionally taking/producing a flag.
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LOAD,
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/// LOAD into r2 (also taking/producing a flag). Like TOC_RESTORE, this is
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/// a hard coded load instruction.
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LOAD_TOC,
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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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/// CALL - A direct function call.
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/// CALL_NOP_SVR4 is a call with the special NOP which follows 64-bit
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/// SVR4 calls.
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CALL_Darwin, CALL_SVR4, CALL_NOP_SVR4,
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/// NOP - Special NOP which follows 64-bit SVR4 calls.
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NOP,
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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 MFCRpseud/MFOCRF
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/// instructions. This copies the bits corresponding to the specified
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/// CRREG into the resultant GPR. Bits corresponding to other CR regs
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/// 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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// 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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/// STD_32 - This is the STD instruction for use with "32-bit" registers.
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STD_32 = ISD::FIRST_TARGET_MEMORY_OPCODE,
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/// CHAIN = STBRX CHAIN, GPRC, Ptr, 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, 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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};
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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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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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virtual MVT getShiftAmountTy(EVT LHSTy) const { return MVT::i32; }
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/// getSetCCResultType - Return the ISD::SETCC ValueType
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virtual EVT getSetCCResultType(EVT 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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Sched::Preference getSchedulingPreference(SDNode *N) 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) const;
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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) const;
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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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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 *
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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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/// Examine constraint string and operand type and determine a weight value.
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/// The operand object must already have been set up with the operand type.
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ConstraintWeight getSingleConstraintMatchWeight(
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AsmOperandInfo &info, const char *constraint) const;
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std::pair<unsigned, const TargetRegisterClass*>
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getRegForInlineAsmConstraint(const std::string &Constraint,
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EVT 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(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.
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virtual void LowerAsmOperandForConstraint(SDValue Op,
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std::string &Constraint,
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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, 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, 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 isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
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/// getOptimalMemOpType - Returns the target specific optimal type for load
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/// and store operations as a result of memset, memcpy, and memmove
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/// lowering. If DstAlign is zero that means it's safe to destination
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/// alignment can satisfy any constraint. Similarly if SrcAlign is zero it
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/// means there isn't a need to check it against alignment requirement,
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/// probably because the source does not need to be loaded. If
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/// 'IsZeroVal' is true, that means it's safe to return a
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/// non-scalar-integer type, e.g. empty string source, constant, or loaded
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/// from memory. 'MemcpyStrSrc' indicates whether the memcpy source is
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/// constant so it does not need to be loaded.
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/// It returns EVT::Other if the type should be determined using generic
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/// target-independent logic.
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virtual EVT
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getOptimalMemOpType(uint64_t Size, unsigned DstAlign, unsigned SrcAlign,
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bool IsZeroVal, bool MemcpyStrSrc,
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MachineFunction &MF) 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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bool
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IsEligibleForTailCallOptimization(SDValue Callee,
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CallingConv::ID 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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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) const;
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SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerINIT_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerADJUST_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG,
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const PPCSubtarget &Subtarget) const;
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SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG,
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const PPCSubtarget &Subtarget) const;
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SDValue LowerSTACKRESTORE(SDValue Op, SelectionDAG &DAG,
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const PPCSubtarget &Subtarget) const;
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SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG,
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const PPCSubtarget &Subtarget) const;
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SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG, DebugLoc dl) const;
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SDValue LowerSINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFLT_ROUNDS_(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSHL_PARTS(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSRL_PARTS(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSRA_PARTS(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerMUL(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
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CallingConv::ID 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) const;
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SDValue FinishCall(CallingConv::ID 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) const;
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virtual SDValue
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LowerFormalArguments(SDValue Chain,
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CallingConv::ID 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) const;
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virtual SDValue
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LowerCall(SDValue Chain, SDValue Callee, CallingConv::ID CallConv,
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bool isVarArg, bool doesNotRet, bool &isTailCall,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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const SmallVectorImpl<SDValue> &OutVals,
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const SmallVectorImpl<ISD::InputArg> &Ins,
|
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals) const;
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|
|
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virtual bool
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CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
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bool isVarArg,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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|
LLVMContext &Context) const;
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|
|
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virtual SDValue
|
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LowerReturn(SDValue Chain,
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CallingConv::ID CallConv, bool isVarArg,
|
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const SmallVectorImpl<ISD::OutputArg> &Outs,
|
|
const SmallVectorImpl<SDValue> &OutVals,
|
|
DebugLoc dl, SelectionDAG &DAG) const;
|
|
|
|
SDValue
|
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LowerFormalArguments_Darwin(SDValue Chain,
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|
CallingConv::ID CallConv, bool isVarArg,
|
|
const SmallVectorImpl<ISD::InputArg> &Ins,
|
|
DebugLoc dl, SelectionDAG &DAG,
|
|
SmallVectorImpl<SDValue> &InVals) const;
|
|
SDValue
|
|
LowerFormalArguments_SVR4(SDValue Chain,
|
|
CallingConv::ID CallConv, bool isVarArg,
|
|
const SmallVectorImpl<ISD::InputArg> &Ins,
|
|
DebugLoc dl, SelectionDAG &DAG,
|
|
SmallVectorImpl<SDValue> &InVals) const;
|
|
|
|
SDValue
|
|
LowerCall_Darwin(SDValue Chain, SDValue Callee, CallingConv::ID CallConv,
|
|
bool isVarArg, bool isTailCall,
|
|
const SmallVectorImpl<ISD::OutputArg> &Outs,
|
|
const SmallVectorImpl<SDValue> &OutVals,
|
|
const SmallVectorImpl<ISD::InputArg> &Ins,
|
|
DebugLoc dl, SelectionDAG &DAG,
|
|
SmallVectorImpl<SDValue> &InVals) const;
|
|
SDValue
|
|
LowerCall_SVR4(SDValue Chain, SDValue Callee, CallingConv::ID CallConv,
|
|
bool isVarArg, bool isTailCall,
|
|
const SmallVectorImpl<ISD::OutputArg> &Outs,
|
|
const SmallVectorImpl<SDValue> &OutVals,
|
|
const SmallVectorImpl<ISD::InputArg> &Ins,
|
|
DebugLoc dl, SelectionDAG &DAG,
|
|
SmallVectorImpl<SDValue> &InVals) const;
|
|
};
|
|
}
|
|
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#endif // LLVM_TARGET_POWERPC_PPC32ISELLOWERING_H
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