1 //===-- X86InstrFoldTables.h - X86 Instruction Folding Tables ---*- C++ -*-===//
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
7 //===----------------------------------------------------------------------===//
9 // This file contains the interface to query the X86 memory folding tables.
11 //===----------------------------------------------------------------------===//
13 #ifndef LLVM_LIB_TARGET_X86_X86INSTRFOLDTABLES_H
14 #define LLVM_LIB_TARGET_X86_X86INSTRFOLDTABLES_H
16 #include "llvm/Support/DataTypes.h"
21 // Select which memory operand is being unfolded.
22 // (stored in bits 0 - 3)
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,
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,
39 TB_FOLDED_LOAD
= 1 << 6,
40 TB_FOLDED_STORE
= 1 << 7,
42 // Minimum alignment required for load/store.
43 // Used for RegOp->MemOp conversion.
44 // (stored in bits 8 - 15)
46 TB_ALIGN_NONE
= 0 << TB_ALIGN_SHIFT
,
47 TB_ALIGN_16
= 16 << TB_ALIGN_SHIFT
,
48 TB_ALIGN_32
= 32 << TB_ALIGN_SHIFT
,
49 TB_ALIGN_64
= 64 << TB_ALIGN_SHIFT
,
50 TB_ALIGN_MASK
= 0xff << TB_ALIGN_SHIFT
53 // This struct is used for both the folding and unfold tables. They KeyOp
54 // is used to determine the sorting order.
55 struct X86MemoryFoldTableEntry
{
60 bool operator<(const X86MemoryFoldTableEntry
&RHS
) const {
61 return KeyOp
< RHS
.KeyOp
;
63 bool operator==(const X86MemoryFoldTableEntry
&RHS
) const {
64 return KeyOp
== RHS
.KeyOp
;
66 friend bool operator<(const X86MemoryFoldTableEntry
&TE
, unsigned Opcode
) {
67 return TE
.KeyOp
< Opcode
;
71 // Look up the memory folding table entry for folding a load and a store into
73 const X86MemoryFoldTableEntry
*lookupTwoAddrFoldTable(unsigned RegOp
);
75 // Look up the memory folding table entry for folding a load or store with
77 const X86MemoryFoldTableEntry
*lookupFoldTable(unsigned RegOp
, unsigned OpNum
);
79 // Look up the memory unfolding table entry for this instruction.
80 const X86MemoryFoldTableEntry
*lookupUnfoldTable(unsigned MemOp
);