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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44700 91177308-0d34-0410-b5e6-96231b3b80d8
297 lines
13 KiB
C++
297 lines
13 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 was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source 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+PPC::INSTRUCTION_LIST_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_Macho, CALL_ELF,
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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_Macho, BCTRL_ELF,
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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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};
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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(SDNode *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(SDNode *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(SDNode *N, unsigned UnitSize, 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(SDNode *N, unsigned UnitSize, 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(SDNode *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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SDOperand 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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int ReturnAddrIndex; // FrameIndex for return slot.
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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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/// 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, SDOperand &Base,
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SDOperand &Offset,
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ISD::MemIndexedMode &AM,
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SelectionDAG &DAG);
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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(SDOperand N, SDOperand &Base, SDOperand &Index,
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SelectionDAG &DAG);
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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(SDOperand N, SDOperand &Disp, SDOperand &Base,
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SelectionDAG &DAG);
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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(SDOperand N, SDOperand &Base, SDOperand &Index,
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SelectionDAG &DAG);
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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(SDOperand N, SDOperand &Disp, SDOperand &Base,
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SelectionDAG &DAG);
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/// LowerOperation - Provide custom lowering hooks for some operations.
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///
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virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
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virtual SDNode *ExpandOperationResult(SDNode *N, SelectionDAG &DAG);
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virtual SDOperand PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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virtual void computeMaskedBitsForTargetNode(const SDOperand Op,
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uint64_t Mask,
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uint64_t &KnownZero,
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uint64_t &KnownOne,
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const SelectionDAG &DAG,
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unsigned Depth = 0) const;
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virtual MachineBasicBlock *InsertAtEndOfBasicBlock(MachineInstr *MI,
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MachineBasicBlock *MBB);
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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::ValueType VT) 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(SDOperand Op,
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char ConstraintLetter,
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std::vector<SDOperand> &Ops,
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SelectionDAG &DAG);
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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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SDOperand LowerRETURNADDR(SDOperand Op, SelectionDAG &DAG);
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SDOperand LowerFRAMEADDR(SDOperand Op, SelectionDAG &DAG);
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};
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}
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#endif // LLVM_TARGET_POWERPC_PPC32ISELLOWERING_H
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