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/*
* Copyright (c) 2015-2017, Intel Corporation
* Copyright (c) 2021, Arm Limited
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/** \file
* \brief Acceleration: data structures and common definitions.
*/
#ifndef ACCEL_H
#define ACCEL_H
#include "ue2common.h"
/* run time defs */
#define BAD_ACCEL_DIST 4
#define SMALL_ACCEL_PENALTY 8
#define BIG_ACCEL_PENALTY 32
/// Minimum length of the scan buffer for us to attempt acceleration.
#define ACCEL_MIN_LEN 16
enum AccelType {
ACCEL_NONE,
ACCEL_VERM,
ACCEL_VERM_NOCASE,
ACCEL_DVERM,
ACCEL_DVERM_NOCASE,
ACCEL_RVERM,
ACCEL_RVERM_NOCASE,
ACCEL_RDVERM,
ACCEL_RDVERM_NOCASE,
ACCEL_REOD,
ACCEL_REOD_NOCASE,
ACCEL_RDEOD,
ACCEL_RDEOD_NOCASE,
ACCEL_SHUFTI,
ACCEL_DSHUFTI,
ACCEL_TRUFFLE,
ACCEL_RED_TAPE,
ACCEL_DVERM_MASKED,
ACCEL_VERM16,
ACCEL_DVERM16,
ACCEL_DVERM16_MASKED,
ACCEL_TRUFFLE_WIDE,
};
/** \brief Structure for accel framework. */
union AccelAux {
u8 accel_type;
struct {
u8 accel_type;
u8 offset;
} generic;
struct {
u8 accel_type;
u8 offset;
u8 c; // uppercase if nocase
} verm;
struct {
u8 accel_type;
u8 offset;
u8 c1; // uppercase if nocase
u8 c2; // uppercase if nocase
u8 m1; // masked variant
u8 m2; // masked variant
} dverm;
struct {
u8 accel_type;
u8 offset;
u8 c; // uppercase if nocase
u8 len;
} mverm;
struct {
u8 accel_type;
u8 offset;
u8 c; // uppercase if nocase
u8 len1;
u8 len2;
} mdverm;
struct {
u8 accel_type;
u8 offset;
m128 mask;
} verm16;
struct {
u8 accel_type;
u8 offset;
u64a firsts;
m128 mask;
} dverm16;
struct {
u8 accel_type;
u8 offset;
u8 c1; // used for partial match
u8 m1; // used for partial match
m128 mask;
} mdverm16;
struct {
u8 accel_type;
u8 offset;
m128 lo;
m128 hi;
} shufti;
struct {
u8 accel_type;
u8 offset;
m128 lo1;
m128 hi1;
m128 lo2;
m128 hi2;
} dshufti;
struct {
u8 accel_type;
u8 offset;
union {
m256 mask;
struct {
#if (SIMDE_ENDIAN_ORDER == SIMDE_ENDIAN_LITTLE)
m128 mask_lo;
m128 mask_hi;
#else
m128 mask_hi;
m128 mask_lo;
#endif
};
};
} truffle;
};
/**
* Runs the specified acceleration scheme between c and c_end, returns a point
* such that the acceleration scheme does not match before.
*/
const u8 *run_accel(const union AccelAux *accel, const u8 *c, const u8 *c_end);
#endif