lib/Target/X86/X86InstrFoldTables.h

   1 //===-- X86InstrFoldTables.h - X86 Instruction Folding Tables ---*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file contains the interface to query the X86 memory folding tables.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_LIB_TARGET_X86_X86INSTRFOLDTABLES_H
  15 #define LLVM_LIB_TARGET_X86_X86INSTRFOLDTABLES_H
  16
  17 #include "llvm/Support/DataTypes.h"
  18
  19 namespace llvm {
  20
  21 enum {
  22   // Select which memory operand is being unfolded.
  23   // (stored in bits 0 - 3)
  24   TB_INDEX_0    = 0,
  25   TB_INDEX_1    = 1,
  26   TB_INDEX_2    = 2,
  27   TB_INDEX_3    = 3,
  28   TB_INDEX_4    = 4,
  29   TB_INDEX_MASK = 0xf,
  30
  31   // Do not insert the reverse map (MemOp -> RegOp) into the table.
  32   // This may be needed because there is a many -> one mapping.
  33   TB_NO_REVERSE   = 1 << 4,
  34
  35   // Do not insert the forward map (RegOp -> MemOp) into the table.
  36   // This is needed for Native Client, which prohibits branch
  37   // instructions from using a memory operand.
  38   TB_NO_FORWARD   = 1 << 5,
  39
  40   TB_FOLDED_LOAD  = 1 << 6,
  41   TB_FOLDED_STORE = 1 << 7,
  42
  43   // Minimum alignment required for load/store.
  44   // Used for RegOp->MemOp conversion.
  45   // (stored in bits 8 - 15)
  46   TB_ALIGN_SHIFT = 8,
  47   TB_ALIGN_NONE  =    0 << TB_ALIGN_SHIFT,
  48   TB_ALIGN_16    =   16 << TB_ALIGN_SHIFT,
  49   TB_ALIGN_32    =   32 << TB_ALIGN_SHIFT,
  50   TB_ALIGN_64    =   64 << TB_ALIGN_SHIFT,
  51   TB_ALIGN_MASK  = 0xff << TB_ALIGN_SHIFT
  52 };
  53
  54 // This struct is used for both the folding and unfold tables. They KeyOp
  55 // is used to determine the sorting order.
  56 struct X86MemoryFoldTableEntry {
  57   uint16_t KeyOp;
  58   uint16_t DstOp;
  59   uint16_t Flags;
  60
  61   bool operator<(const X86MemoryFoldTableEntry &RHS) const {
  62     return KeyOp < RHS.KeyOp;
  63   }
  64   bool operator==(const X86MemoryFoldTableEntry &RHS) const {
  65     return KeyOp == RHS.KeyOp;
  66   }
  67   friend bool operator<(const X86MemoryFoldTableEntry &TE, unsigned Opcode) {
  68     return TE.KeyOp < Opcode;
  69   }
  70 };
  71
  72 // Look up the memory folding table entry for folding a load and a store into
  73 // operand 0.
  74 const X86MemoryFoldTableEntry *lookupTwoAddrFoldTable(unsigned RegOp);
  75
  76 // Look up the memory folding table entry for folding a load or store with
  77 // operand OpNum.
  78 const X86MemoryFoldTableEntry *lookupFoldTable(unsigned RegOp, unsigned OpNum);
  79
  80 // Look up the memory unfolding table entry for this instruction.
  81 const X86MemoryFoldTableEntry *lookupUnfoldTable(unsigned MemOp);
  82
  83 } // namespace llvm
  84
  85 #endif