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			477 lines
		
	
	
		
			22 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
			
		
		
	
	
			477 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 "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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      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_Darwin, CALL_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 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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      // 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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    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::SimpleValueType 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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    /// 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,
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                    DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) 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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                                   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(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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						|
    
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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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                                      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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    virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
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						|
    
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    virtual EVT 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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						|
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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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						|
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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 LowerBlockAddress(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);
 | 
						|
    SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG,
 | 
						|
                           int VarArgsFrameIndex, int VarArgsStackOffset,
 | 
						|
                           unsigned VarArgsNumGPR, unsigned VarArgsNumFPR,
 | 
						|
                           const PPCSubtarget &Subtarget);
 | 
						|
    SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG, int VarArgsFrameIndex,
 | 
						|
                         int VarArgsStackOffset, unsigned VarArgsNumGPR,
 | 
						|
                         unsigned VarArgsNumFPR, const PPCSubtarget &Subtarget);
 | 
						|
    SDValue LowerSTACKRESTORE(SDValue Op, SelectionDAG &DAG,
 | 
						|
                                const PPCSubtarget &Subtarget);
 | 
						|
    SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG,
 | 
						|
                                      const PPCSubtarget &Subtarget);
 | 
						|
    SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
 | 
						|
    SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG, DebugLoc dl);
 | 
						|
    SDValue LowerSINT_TO_FP(SDValue Op, SelectionDAG &DAG);
 | 
						|
    SDValue LowerFLT_ROUNDS_(SDValue Op, SelectionDAG &DAG);
 | 
						|
    SDValue LowerSHL_PARTS(SDValue Op, SelectionDAG &DAG);
 | 
						|
    SDValue LowerSRL_PARTS(SDValue Op, SelectionDAG &DAG);
 | 
						|
    SDValue LowerSRA_PARTS(SDValue Op, SelectionDAG &DAG);
 | 
						|
    SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG);
 | 
						|
    SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG);
 | 
						|
    SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG);
 | 
						|
    SDValue LowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG);
 | 
						|
    SDValue LowerMUL(SDValue Op, SelectionDAG &DAG);
 | 
						|
 | 
						|
    SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
 | 
						|
                            CallingConv::ID CallConv, bool isVarArg,
 | 
						|
                            const SmallVectorImpl<ISD::InputArg> &Ins,
 | 
						|
                            DebugLoc dl, SelectionDAG &DAG,
 | 
						|
                            SmallVectorImpl<SDValue> &InVals);
 | 
						|
    SDValue FinishCall(CallingConv::ID CallConv, DebugLoc dl, bool isTailCall,
 | 
						|
                       bool isVarArg,
 | 
						|
                       SelectionDAG &DAG,
 | 
						|
                       SmallVector<std::pair<unsigned, SDValue>, 8>
 | 
						|
                         &RegsToPass,
 | 
						|
                       SDValue InFlag, SDValue Chain,
 | 
						|
                       SDValue &Callee,
 | 
						|
                       int SPDiff, unsigned NumBytes,
 | 
						|
                       const SmallVectorImpl<ISD::InputArg> &Ins,
 | 
						|
                       SmallVectorImpl<SDValue> &InVals);
 | 
						|
 | 
						|
    virtual SDValue
 | 
						|
      LowerFormalArguments(SDValue Chain,
 | 
						|
                           CallingConv::ID CallConv, bool isVarArg,
 | 
						|
                           const SmallVectorImpl<ISD::InputArg> &Ins,
 | 
						|
                           DebugLoc dl, SelectionDAG &DAG,
 | 
						|
                           SmallVectorImpl<SDValue> &InVals);
 | 
						|
 | 
						|
    virtual SDValue
 | 
						|
      LowerCall(SDValue Chain, SDValue Callee,
 | 
						|
                CallingConv::ID CallConv, bool isVarArg, bool isTailCall,
 | 
						|
                const SmallVectorImpl<ISD::OutputArg> &Outs,
 | 
						|
                const SmallVectorImpl<ISD::InputArg> &Ins,
 | 
						|
                DebugLoc dl, SelectionDAG &DAG,
 | 
						|
                SmallVectorImpl<SDValue> &InVals);
 | 
						|
 | 
						|
    virtual SDValue
 | 
						|
      LowerReturn(SDValue Chain,
 | 
						|
                  CallingConv::ID CallConv, bool isVarArg,
 | 
						|
                  const SmallVectorImpl<ISD::OutputArg> &Outs,
 | 
						|
                  DebugLoc dl, SelectionDAG &DAG);
 | 
						|
 | 
						|
    SDValue
 | 
						|
      LowerFormalArguments_Darwin(SDValue Chain,
 | 
						|
                                  CallingConv::ID CallConv, bool isVarArg,
 | 
						|
                                  const SmallVectorImpl<ISD::InputArg> &Ins,
 | 
						|
                                  DebugLoc dl, SelectionDAG &DAG,
 | 
						|
                                  SmallVectorImpl<SDValue> &InVals);
 | 
						|
    SDValue
 | 
						|
      LowerFormalArguments_SVR4(SDValue Chain,
 | 
						|
                                CallingConv::ID CallConv, bool isVarArg,
 | 
						|
                                const SmallVectorImpl<ISD::InputArg> &Ins,
 | 
						|
                                DebugLoc dl, SelectionDAG &DAG,
 | 
						|
                                SmallVectorImpl<SDValue> &InVals);
 | 
						|
 | 
						|
    SDValue
 | 
						|
      LowerCall_Darwin(SDValue Chain, SDValue Callee,
 | 
						|
                       CallingConv::ID CallConv, bool isVarArg, bool isTailCall,
 | 
						|
                       const SmallVectorImpl<ISD::OutputArg> &Outs,
 | 
						|
                       const SmallVectorImpl<ISD::InputArg> &Ins,
 | 
						|
                       DebugLoc dl, SelectionDAG &DAG,
 | 
						|
                       SmallVectorImpl<SDValue> &InVals);
 | 
						|
    SDValue
 | 
						|
      LowerCall_SVR4(SDValue Chain, SDValue Callee,
 | 
						|
                     CallingConv::ID CallConv, bool isVarArg, bool isTailCall,
 | 
						|
                     const SmallVectorImpl<ISD::OutputArg> &Outs,
 | 
						|
                     const SmallVectorImpl<ISD::InputArg> &Ins,
 | 
						|
                     DebugLoc dl, SelectionDAG &DAG,
 | 
						|
                     SmallVectorImpl<SDValue> &InVals);
 | 
						|
  };
 | 
						|
}
 | 
						|
 | 
						|
#endif   // LLVM_TARGET_POWERPC_PPC32ISELLOWERING_H
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