vectorscan/unit/internal/rvermicelli.cpp
2024-05-17 13:57:12 +03:00

567 lines
18 KiB
C++

/*
* Copyright (c) 2015, 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.
*/
#include "config.h"
#include "gtest/gtest.h"
#include "nfa/vermicelli.hpp"
#define BOUND (~(VERM_BOUNDARY - 1))
TEST(RVermicelli, ExecNoMatch1) {
char t1[] = "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
for (size_t i = 0; i < 16; i++) {
for (size_t j = 0; j < 16; j++) {
const u8 *begin = reinterpret_cast<const u8 *>(t1) + i;
const u8 *end = reinterpret_cast<const u8 *>(t1) + strlen(t1) - j;
const u8 *rv = rvermicelliExec('a', 0, begin, end);
ASSERT_EQ(begin - 1, rv);
rv = rvermicelliExec('B', 0, begin, end);
ASSERT_EQ(begin - 1, rv);
rv = rvermicelliExec('A', 1, begin, end);
ASSERT_EQ(begin - 1, rv);
}
}
}
TEST(RVermicelli, Exec1) {
char t1[] = "bbbbbbbbbbbbbbbbbabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbabbbbbbbbbbbbbbbbbbbbb";
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rvermicelliExec('a', 0, reinterpret_cast<const u8 *>(t1),
reinterpret_cast<const u8 *>(t1) + strlen(t1) - i);
ASSERT_EQ((size_t)t1 + 48, (size_t)rv);
rv = rvermicelliExec('A', 1, reinterpret_cast<const u8 *>(t1) + i, reinterpret_cast<const u8 *>(t1) + strlen(t1));
ASSERT_EQ((size_t)t1 + 48, (size_t)rv);
}
}
TEST(RVermicelli, Exec2) {
char t1[] = "bbbbbbbbbbbbbbbbbabbbbbbbbaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbb";
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rvermicelliExec('a', 0, reinterpret_cast<const u8 *>(t1),
reinterpret_cast<const u8 *>(t1) + strlen(t1) - i);
ASSERT_EQ((size_t)t1 + 48, (size_t)rv);
rv = rvermicelliExec('A', 1, reinterpret_cast<const u8 *>(t1), reinterpret_cast<const u8 *>(t1) + strlen(t1) - i);
ASSERT_EQ((size_t)t1 + 48, (size_t)rv);
}
}
TEST(RVermicelli, Exec3) {
char t1[] = "bbbbbbbbbbbbbbbbbabbbbbbbbaaaaaaaaaaaaaaaaaaaaaaAbbbbbbbbbbbbbbbbbbbbbb";
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rvermicelliExec('a', 0, reinterpret_cast<const u8 *>(t1),
reinterpret_cast<const u8 *>(t1)+ strlen(t1) - i);
ASSERT_EQ((size_t)t1 + 47, (size_t)rv);
rv = rvermicelliExec('A', 1, reinterpret_cast<const u8 *>(t1), reinterpret_cast<const u8 *>(t1) + strlen(t1) - i);
ASSERT_EQ((size_t)t1 + 48, (size_t)rv);
}
}
TEST(RVermicelli, Exec4) {
char t1[] = "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
for (size_t i = 0; i < 31; i++) {
t1[16 + i] = 'a';
const u8 *rv = rvermicelliExec('a', 0, reinterpret_cast<const u8 *>(t1), reinterpret_cast<const u8 *>(t1) + strlen(t1));
ASSERT_EQ((size_t)&t1[16 + i], (size_t)rv);
rv = rvermicelliExec('A', 1, reinterpret_cast<const u8 *>(t1), reinterpret_cast<const u8 *>(t1) + strlen(t1));
ASSERT_EQ((size_t)&t1[16 + i], (size_t)rv);
}
}
TEST(RNVermicelli, ExecNoMatch1) {
char t1[] = "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = reinterpret_cast<const u8 *>(t1);
for (size_t i = 0; i < 16; i++) {
SCOPED_TRACE(i);
for (size_t j = 0; j < 16; j++) {
SCOPED_TRACE(j);
const u8 *rv = rnvermicelliExec('b', 0, buf + i,
buf + strlen(t1) - j);
ASSERT_EQ(buf + i - 1, rv);
rv = rnvermicelliExec('B', 1, buf + i, buf + strlen(t1) - j);
ASSERT_EQ(buf + i - 1, rv);
}
}
}
TEST(RNVermicelli, Exec1) {
char t1[] = "bbbbbbbbbbbbbbbbbabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbabbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = reinterpret_cast<const u8 *>(t1);
for (size_t i = 0; i < 16; i++) {
SCOPED_TRACE(i);
const u8 *rv = rnvermicelliExec('b', 0, buf, buf + strlen(t1) - i);
ASSERT_EQ(buf + 48, rv);
rv = rnvermicelliExec('B', 1, buf + i, buf + strlen(t1) - i);
ASSERT_EQ(buf + 48, rv);
}
}
TEST(RNVermicelli, Exec2) {
char t1[] = "bbbbbbbbbbbbbbbbbabbbbbbbbaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = reinterpret_cast<const u8 *>(t1);
for (size_t i = 0; i < 16; i++) {
SCOPED_TRACE(i);
const u8 *rv = rnvermicelliExec('b', 0, buf, buf + strlen(t1) - i);
ASSERT_EQ(buf + 48, rv);
rv = rnvermicelliExec('B', 1, buf + i, buf + strlen(t1) - i);
ASSERT_EQ(buf + 48, rv);
}
}
TEST(RNVermicelli, Exec3) {
char t1[] = "bbbbbbbbbbbbbbbbbabbbbbbbbaaaaaaaaaaaaaaaaaaaaaaAbbbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = reinterpret_cast<const u8 *>(t1);
for (size_t i = 0; i < 16; i++) {
SCOPED_TRACE(i);
const u8 *rv = rnvermicelliExec('b', 0, buf + i, buf + strlen(t1));
ASSERT_EQ(buf + 48, rv);
rv = rnvermicelliExec('B', 1, buf + i, buf + strlen(t1));
ASSERT_EQ(buf + 48, rv);
}
}
TEST(RNVermicelli, Exec4) {
char t1[] = "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = reinterpret_cast<const u8 *>(t1);
for (size_t i = 0; i < 31; i++) {
SCOPED_TRACE(i);
t1[16 + i] = 'a';
const u8 *rv = rnvermicelliExec('b', 0, buf, buf + strlen(t1));
ASSERT_EQ(buf + 16 + i, rv);
rv = rnvermicelliExec('B', 1, buf, buf + strlen(t1));
ASSERT_EQ(buf + 16 + i, rv);
}
}
TEST(RDoubleVermicelli, Exec1) {
char t1[] = "bbbbbbbbbbbbbbbbbbabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbabbbbbbbbbbbbbbbbbbbbb";
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rvermicelliDoubleExec('a', 'b', 0, reinterpret_cast<const u8 *>(t1),
reinterpret_cast<const u8 *>(t1) + strlen(t1) - i);
ASSERT_EQ((size_t)t1 + 50, (size_t)rv);
rv = rvermicelliDoubleExec('A', 'B', 1, reinterpret_cast<const u8 *>(t1)+ i,
reinterpret_cast<const u8 *>(t1) + strlen(t1));
ASSERT_EQ((size_t)t1 + 50, (size_t)rv);
rv = rvermicelliDoubleExec('b', 'a', 0, reinterpret_cast<const u8 *>(t1) + i,
reinterpret_cast<const u8 *>(t1) + strlen(t1));
ASSERT_EQ((size_t)t1 + 49, (size_t)rv);
rv = rvermicelliDoubleExec('B', 'A', 1, reinterpret_cast<const u8 *>(t1) + i,
reinterpret_cast<const u8 *>(t1) + strlen(t1));
ASSERT_EQ((size_t)t1 + 49, (size_t)rv);
}
}
TEST(RDoubleVermicelli, Exec2) {
char t1[] = "bbbbbbbbbbbbbbbbbaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbaaaaabbbbbbbbbbbbbbbbbb";
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rvermicelliDoubleExec('a', 'a', 0, reinterpret_cast<const u8 *>(t1),
reinterpret_cast<const u8 *>(t1) + strlen(t1) - i);
ASSERT_EQ((size_t)t1 + 52, (size_t)rv);
rv = rvermicelliDoubleExec('A', 'A', 1, reinterpret_cast<const u8 *>(t1),
reinterpret_cast<const u8 *>(t1) + strlen(t1) - i);
ASSERT_EQ((size_t)t1 + 52, (size_t)rv);
}
}
TEST(RDoubleVermicelli, Exec3) {
/* 012345678901234567890123 */
char t1[] = "bbbbbbbbbbbbbbbbbaAaaAAaaaaaaaaaaaaaaaaaabbbbbbbaaaaabbbbbbbbbbbbbbbbbb";
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rvermicelliDoubleExec('A', 'a', 0, reinterpret_cast<const u8 *>(t1),
reinterpret_cast<const u8 *>(t1) + strlen(t1) - i );
ASSERT_EQ((size_t)t1 + 23, (size_t)rv);
rv = rvermicelliDoubleExec('A', 'A', 1, reinterpret_cast<const u8 *>(t1),
reinterpret_cast<const u8 *>(t1) + strlen(t1) - i);
ASSERT_EQ((size_t)t1 + 52, (size_t)rv);
rv = rvermicelliDoubleExec('A', 'A', 0, reinterpret_cast<const u8 *>(t1),
reinterpret_cast<const u8 *>(t1) + strlen(t1) - i);
ASSERT_EQ((size_t)t1 + 22, (size_t)rv);
rv = rvermicelliDoubleExec('a', 'A', 0, reinterpret_cast<const u8 *>(t1),
reinterpret_cast<const u8 *>(t1) + strlen(t1) - i);
ASSERT_EQ((size_t)t1 + 21, (size_t)rv);
}
}
TEST(RDoubleVermicelli, Exec4) {
char t1[] = "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
for (size_t i = 0; i < 31; i++) {
t1[32 + i] = 'a';
t1[32 + i - 1] = 'a';
const u8 *rv = rvermicelliDoubleExec('a', 'a', 0, reinterpret_cast<const u8 *>(t1),
reinterpret_cast<const u8 *>(t1) + strlen(t1));
ASSERT_EQ((size_t)&t1[32 + i], (size_t)rv);
rv = rvermicelliDoubleExec('A', 'A', 1, reinterpret_cast<const u8 *>(t1), reinterpret_cast<const u8 *>(t1) + strlen(t1));
ASSERT_EQ((size_t)&t1[32 + i], (size_t)rv);
}
}
TEST(RDoubleVermicelli, Exec5) {
char t1[] = "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
for (size_t i = 0; i < 16; i++) {
for (size_t j = 1; j <= 16; j++) {
t1[strlen(t1) - i - j] = 'a';
const u8 *rv = rvermicelliDoubleExec('b', 'a', 0, reinterpret_cast<const u8 *>(t1),
reinterpret_cast<const u8 *>(t1) + strlen(t1) - i);
ASSERT_EQ((size_t)&t1[strlen(t1) - i - j], (size_t)rv);
rv = rvermicelliDoubleExec('B', 'A', 1, reinterpret_cast<const u8 *>(t1),
reinterpret_cast<const u8 *>(t1) + strlen(t1) -i );
ASSERT_EQ((size_t)&t1[strlen(t1) - i - j], (size_t)rv);
t1[strlen(t1) - i - j] = 'b';
}
}
}
#ifdef HAVE_SVE2
#include "nfa/vermicellicompile.h"
using namespace ue2;
TEST(RVermicelli16, ExecNoMatch1) {
char t1[] = "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
CharReach chars;
chars.set('a');
chars.set('B');
chars.set('A');
m128 matches;
bool ret = vermicelli16Build(chars, (u8 *)&matches);
ASSERT_TRUE(ret);
for (size_t i = 0; i < 16; i++) {
for (size_t j = 0; j < 16; j++) {
const u8 *begin = (const u8 *)t1 + i;
const u8 *end = (const u8 *)t1 + strlen(t1) - j;
const u8 *rv = rvermicelli16Exec(matches, begin, end);
ASSERT_EQ(begin - 1, rv);
}
}
}
TEST(RVermicelli16, Exec1) {
char t1[] = "bbbbbbbbbbbbbbbbbabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbabbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = (const u8 *)t1;
CharReach chars;
chars.set('a');
chars.set('A');
m128 matches;
bool ret = vermicelli16Build(chars, (u8 *)&matches);
ASSERT_TRUE(ret);
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rvermicelli16Exec(matches, buf, buf + strlen(t1) - i);
ASSERT_EQ(buf + 48, rv);
}
}
TEST(RVermicelli16, Exec2) {
char t1[] = "bbbbbbbbbbbbbbbbbabbbbbbbbaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = (const u8 *)t1;
CharReach chars;
chars.set('a');
chars.set('A');
m128 matches;
bool ret = vermicelli16Build(chars, (u8 *)&matches);
ASSERT_TRUE(ret);
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rvermicelli16Exec(matches, buf + i, buf + strlen(t1));
ASSERT_EQ(buf + 48, rv);
}
}
TEST(RVermicelli16, Exec3) {
char t1[] = "bbbbbbbbbbbbbbbbbabbbbbbbbaaaaaaaaaaaaaaaaaaaaaaAbbbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = (const u8 *)t1;
CharReach chars;
chars.set('a');
m128 matches_a;
bool ret = vermicelli16Build(chars, (u8 *)&matches_a);
ASSERT_TRUE(ret);
chars.set('A');
m128 matches_A;
ret = vermicelli16Build(chars, (u8 *)&matches_A);
ASSERT_TRUE(ret);
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rvermicelli16Exec(matches_a, buf, buf + strlen(t1) - i);
ASSERT_EQ(buf + 47, rv);
rv = rvermicelli16Exec(matches_A, buf, buf + strlen(t1) - i);
ASSERT_EQ(buf + 48, rv);
}
}
TEST(RVermicelli16, Exec4) {
char t1[] = "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = (const u8 *)t1;
CharReach chars;
chars.set('a');
m128 matches_a;
bool ret = vermicelli16Build(chars, (u8 *)&matches_a);
ASSERT_TRUE(ret);
chars.set('A');
m128 matches_A;
ret = vermicelli16Build(chars, (u8 *)&matches_A);
ASSERT_TRUE(ret);
for (size_t i = 0; i < 31; i++) {
t1[16 + i] = 'a';
const u8 *rv = rvermicelli16Exec(matches_a, buf, buf + strlen(t1));
ASSERT_EQ(buf + 16 + i, rv);
rv = rvermicelli16Exec(matches_A, buf, buf + strlen(t1));
ASSERT_EQ(buf + 16 + i, rv);
}
}
TEST(RVermicelli16, Exec5) {
char t1[] = "qqqqqqqqqqqqqqqqqabcdefghijklmnopqqqqqqqqqqqqqqqqqqqqq";
const u8 *buf = (const u8 *)t1;
CharReach chars;
m128 matches[16];
bool ret;
for (int i = 0; i < 16; ++i) {
chars.set('a' + i);
ret = vermicelli16Build(chars, (u8 *)&matches[i]);
ASSERT_TRUE(ret);
}
for (int j = 0; j < 16; ++j) {
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rvermicelli16Exec(matches[j], buf, buf + strlen(t1) - i);
ASSERT_EQ(buf + j + 17, rv);
}
}
}
TEST(RNVermicelli16, ExecNoMatch1) {
char t1[] = "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = (const u8 *)t1;
CharReach chars;
chars.set('b');
chars.set('B');
chars.set('A');
m128 matches;
bool ret = vermicelli16Build(chars, (u8 *)&matches);
ASSERT_TRUE(ret);
for (size_t i = 0; i < 16; i++) {
for (size_t j = 0; j < 16; j++) {
const u8 *rv = rnvermicelli16Exec(matches, buf + i, buf + strlen(t1) - j);
ASSERT_EQ(buf + i - 1, rv);
}
}
}
TEST(RNVermicelli16, Exec1) {
char t1[] = "bbbbbbbbbbbbbbbbbabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbabbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = (const u8 *)t1;
CharReach chars;
chars.set('b');
chars.set('A');
m128 matches;
bool ret = vermicelli16Build(chars, (u8 *)&matches);
ASSERT_TRUE(ret);
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rnvermicelli16Exec(matches, buf + i, buf + strlen(t1) - i);
ASSERT_EQ(buf + 48, rv);
}
}
TEST(RNVermicelli16, Exec2) {
char t1[] = "bbbbbbbbbbbbbbbbbabbbbbbbbaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = (const u8 *)t1;
CharReach chars;
chars.set('b');
chars.set('A');
m128 matches;
bool ret = vermicelli16Build(chars, (u8 *)&matches);
ASSERT_TRUE(ret);
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rnvermicelli16Exec(matches, buf, buf + strlen(t1) - i);
ASSERT_EQ(buf + 48, rv);
}
}
TEST(RNVermicelli16, Exec3) {
char t1[] = "bbbbbbbbbbbbbbbbbabbbbbbbbaaaaaaaaaaaaaaaaaaaaaaAbbbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = (const u8 *)t1;
CharReach chars;
chars.set('b');
m128 matches_b;
bool ret = vermicelli16Build(chars, (u8 *)&matches_b);
ASSERT_TRUE(ret);
chars.set('A');
m128 matches_A;
ret = vermicelli16Build(chars, (u8 *)&matches_A);
ASSERT_TRUE(ret);
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rnvermicelli16Exec(matches_b, buf + i, buf + strlen(t1));
ASSERT_EQ(buf + 48, rv);
rv = rnvermicelli16Exec(matches_A, buf + i, buf + strlen(t1));
ASSERT_EQ(buf + 47, rv);
}
}
TEST(RNVermicelli16, Exec4) {
char t1[] = "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
const u8 *buf = (const u8 *)t1;
CharReach chars;
chars.set('b');
m128 matches_b;
bool ret = vermicelli16Build(chars, (u8 *)&matches_b);
ASSERT_TRUE(ret);
chars.set('A');
m128 matches_A;
ret = vermicelli16Build(chars, (u8 *)&matches_A);
ASSERT_TRUE(ret);
for (size_t i = 0; i < 31; i++) {
t1[16 + i] = 'a';
const u8 *rv = rnvermicelli16Exec(matches_b, buf, buf + strlen(t1));
ASSERT_EQ(buf + 16 + i, rv);
rv = rnvermicelli16Exec(matches_A, buf, buf + strlen(t1));
ASSERT_EQ(buf + 16 + i, rv);
}
}
TEST(RNVermicelli16, Exec5) {
char t1[] = "aaaaaaaaaaaaaaaaaabcdefghijklmnopqqqqqqqqqqqqqqqqqqqqqqqq";
const u8 *buf = (const u8 *)t1;
CharReach chars;
m128 matches[16];
bool ret;
for (int i = 0; i < 16; ++i) {
chars.set('q' - i);
ret = vermicelli16Build(chars, (u8 *)&matches[i]);
ASSERT_TRUE(ret);
}
for (int j = 0; j < 16; ++j) {
for (size_t i = 0; i < 16; i++) {
const u8 *rv = rnvermicelli16Exec(matches[j], buf, buf + strlen(t1) - i);
ASSERT_EQ(buf - j + 32, rv);
}
}
}
#endif // HAVE_SVE2