LLVM  9.0.0svn
X86InstrFoldTables.h
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1 //===-- X86InstrFoldTables.h - X86 Instruction Folding Tables ---*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file contains the interface to query the X86 memory folding tables.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_X86_X86INSTRFOLDTABLES_H
14 #define LLVM_LIB_TARGET_X86_X86INSTRFOLDTABLES_H
15 
16 #include "llvm/Support/DataTypes.h"
17 
18 namespace llvm {
19 
20 enum {
21  // Select which memory operand is being unfolded.
22  // (stored in bits 0 - 3)
29 
30  // Do not insert the reverse map (MemOp -> RegOp) into the table.
31  // This may be needed because there is a many -> one mapping.
32  TB_NO_REVERSE = 1 << 4,
33 
34  // Do not insert the forward map (RegOp -> MemOp) into the table.
35  // This is needed for Native Client, which prohibits branch
36  // instructions from using a memory operand.
37  TB_NO_FORWARD = 1 << 5,
38 
39  TB_FOLDED_LOAD = 1 << 6,
40  TB_FOLDED_STORE = 1 << 7,
41 
42  // Minimum alignment required for load/store.
43  // Used for RegOp->MemOp conversion.
44  // (stored in bits 8 - 15)
51 };
52 
53 // This struct is used for both the folding and unfold tables. They KeyOp
54 // is used to determine the sorting order.
56  uint16_t KeyOp;
57  uint16_t DstOp;
58  uint16_t Flags;
59 
60  bool operator<(const X86MemoryFoldTableEntry &RHS) const {
61  return KeyOp < RHS.KeyOp;
62  }
63  bool operator==(const X86MemoryFoldTableEntry &RHS) const {
64  return KeyOp == RHS.KeyOp;
65  }
66  friend bool operator<(const X86MemoryFoldTableEntry &TE, unsigned Opcode) {
67  return TE.KeyOp < Opcode;
68  }
69 };
70 
71 // Look up the memory folding table entry for folding a load and a store into
72 // operand 0.
73 const X86MemoryFoldTableEntry *lookupTwoAddrFoldTable(unsigned RegOp);
74 
75 // Look up the memory folding table entry for folding a load or store with
76 // operand OpNum.
77 const X86MemoryFoldTableEntry *lookupFoldTable(unsigned RegOp, unsigned OpNum);
78 
79 // Look up the memory unfolding table entry for this instruction.
80 const X86MemoryFoldTableEntry *lookupUnfoldTable(unsigned MemOp);
81 
82 } // namespace llvm
83 
84 #endif
const X86MemoryFoldTableEntry * lookupUnfoldTable(unsigned MemOp)
This class represents lattice values for constants.
Definition: AllocatorList.h:23
const X86MemoryFoldTableEntry * lookupFoldTable(unsigned RegOp, unsigned OpNum)
bool operator==(const X86MemoryFoldTableEntry &RHS) const
bool operator<(const X86MemoryFoldTableEntry &RHS) const
const X86MemoryFoldTableEntry * lookupTwoAddrFoldTable(unsigned RegOp)
friend bool operator<(const X86MemoryFoldTableEntry &TE, unsigned Opcode)