X86InstrFoldTables.h revision 360784 
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
18namespace llvm {
19
20enum {
21  // Select which memory operand is being unfolded.
22  // (stored in bits 0 - 2)
23  TB_INDEX_0    = 0,
24  TB_INDEX_1    = 1,
25  TB_INDEX_2    = 2,
26  TB_INDEX_3    = 3,
27  TB_INDEX_4    = 4,
28  TB_INDEX_MASK = 0x7,
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 << 3,
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 << 4,
38
39  TB_FOLDED_LOAD  = 1 << 5,
40  TB_FOLDED_STORE = 1 << 6,
41  TB_FOLDED_BCAST = 1 << 7,
42
43  // Minimum alignment required for load/store.
44  // Used for RegOp->MemOp conversion. Encoded as Log2(Align) + 1 to allow 0
45  // to mean align of 0.
46  // (stored in bits 8 - 11)
47  TB_ALIGN_SHIFT = 8,
48  TB_ALIGN_NONE  =   0 << TB_ALIGN_SHIFT,
49  TB_ALIGN_16    =   5 << TB_ALIGN_SHIFT,
50  TB_ALIGN_32    =   6 << TB_ALIGN_SHIFT,
51  TB_ALIGN_64    =   7 << TB_ALIGN_SHIFT,
52  TB_ALIGN_MASK  = 0xf << TB_ALIGN_SHIFT,
53
54  // Broadcast type.
55  // (stored in bits 12 - 13)
56  TB_BCAST_TYPE_SHIFT = 12,
57  TB_BCAST_D    =   0 << TB_BCAST_TYPE_SHIFT,
58  TB_BCAST_Q    =   1 << TB_BCAST_TYPE_SHIFT,
59  TB_BCAST_SS   =   2 << TB_BCAST_TYPE_SHIFT,
60  TB_BCAST_SD   =   3 << TB_BCAST_TYPE_SHIFT,
61  TB_BCAST_MASK = 0x3 << TB_BCAST_TYPE_SHIFT,
62
63  // Unused bits 14-15
64};
65
66// This struct is used for both the folding and unfold tables. They KeyOp
67// is used to determine the sorting order.
68struct X86MemoryFoldTableEntry {
69  uint16_t KeyOp;
70  uint16_t DstOp;
71  uint16_t Flags;
72
73  bool operator<(const X86MemoryFoldTableEntry &RHS) const {
74    return KeyOp < RHS.KeyOp;
75  }
76  bool operator==(const X86MemoryFoldTableEntry &RHS) const {
77    return KeyOp == RHS.KeyOp;
78  }
79  friend bool operator<(const X86MemoryFoldTableEntry &TE, unsigned Opcode) {
80    return TE.KeyOp < Opcode;
81  }
82};
83
84// Look up the memory folding table entry for folding a load and a store into
85// operand 0.
86const X86MemoryFoldTableEntry *lookupTwoAddrFoldTable(unsigned RegOp);
87
88// Look up the memory folding table entry for folding a load or store with
89// operand OpNum.
90const X86MemoryFoldTableEntry *lookupFoldTable(unsigned RegOp, unsigned OpNum);
91
92// Look up the memory unfolding table entry for this instruction.
93const X86MemoryFoldTableEntry *lookupUnfoldTable(unsigned MemOp);
94
95} // namespace llvm
96
97#endif
98