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//===-- X86InstrFoldTables.h - X86 Instruction Folding Tables ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains the interface to query the X86 memory folding tables.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_X86_X86INSTRFOLDTABLES_H
#define LLVM_LIB_TARGET_X86_X86INSTRFOLDTABLES_H
#include "llvm/Support/DataTypes.h"
namespace llvm {
enum {
// Select which memory operand is being unfolded.
// (stored in bits 0 - 3)
TB_INDEX_0 = 0,
TB_INDEX_1 = 1,
TB_INDEX_2 = 2,
TB_INDEX_3 = 3,
TB_INDEX_4 = 4,
TB_INDEX_MASK = 0xf,
// Do not insert the reverse map (MemOp -> RegOp) into the table.
// This may be needed because there is a many -> one mapping.
TB_NO_REVERSE = 1 << 4,
// Do not insert the forward map (RegOp -> MemOp) into the table.
// This is needed for Native Client, which prohibits branch
// instructions from using a memory operand.
TB_NO_FORWARD = 1 << 5,
TB_FOLDED_LOAD = 1 << 6,
TB_FOLDED_STORE = 1 << 7,
// Minimum alignment required for load/store.
// Used for RegOp->MemOp conversion.
// (stored in bits 8 - 15)
TB_ALIGN_SHIFT = 8,
TB_ALIGN_NONE = 0 << TB_ALIGN_SHIFT,
TB_ALIGN_16 = 16 << TB_ALIGN_SHIFT,
TB_ALIGN_32 = 32 << TB_ALIGN_SHIFT,
TB_ALIGN_64 = 64 << TB_ALIGN_SHIFT,
TB_ALIGN_MASK = 0xff << TB_ALIGN_SHIFT
};
// This struct is used for both the folding and unfold tables. They KeyOp
// is used to determine the sorting order.
struct X86MemoryFoldTableEntry {
uint16_t KeyOp;
uint16_t DstOp;
uint16_t Flags;
bool operator<(const X86MemoryFoldTableEntry &RHS) const {
return KeyOp < RHS.KeyOp;
}
bool operator==(const X86MemoryFoldTableEntry &RHS) const {
return KeyOp == RHS.KeyOp;
}
friend bool operator<(const X86MemoryFoldTableEntry &TE, unsigned Opcode) {
return TE.KeyOp < Opcode;
}
};
// Look up the memory folding table entry for folding a load and a store into
// operand 0.
const X86MemoryFoldTableEntry *lookupTwoAddrFoldTable(unsigned RegOp);
// Look up the memory folding table entry for folding a load or store with
// operand OpNum.
const X86MemoryFoldTableEntry *lookupFoldTable(unsigned RegOp, unsigned OpNum);
// Look up the memory unfolding table entry for this instruction.
const X86MemoryFoldTableEntry *lookupUnfoldTable(unsigned MemOp);
} // namespace llvm
#endif
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