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382 lines
11 KiB
C
382 lines
11 KiB
C
/* Copyright (C) 2007-2013 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Victor Julien <victor@inliniac.net>
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*
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* Memcmp implementations for SSE3, SSE4.1, SSE4.2 and TILE-Gx SIMD.
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*
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* Both SCMemcmp and SCMemcmpLowercase return 0 on a exact match,
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* 1 on a failed match.
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*/
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#ifndef __UTIL_MEMCMP_H__
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#define __UTIL_MEMCMP_H__
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#include "util-optimize.h"
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/** \brief compare two patterns, converting the 2nd to lowercase
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* \warning *ONLY* the 2nd pattern is converted to lowercase
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*/
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static inline int SCMemcmpLowercase(const void *, const void *, size_t);
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void MemcmpRegisterTests(void);
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static inline int
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MemcmpLowercase(const void *s1, const void *s2, size_t n)
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{
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ssize_t i;
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/* check backwards because we already tested the first
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* 2 to 4 chars. This way we are more likely to detect
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* a miss and thus speed up a little... */
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for (i = n - 1; i >= 0; i--) {
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if (((uint8_t *)s1)[i] != u8_tolower(*(((uint8_t *)s2)+i)))
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return 1;
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}
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return 0;
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}
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#if defined(__SSE4_2__)
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#include <nmmintrin.h>
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/* No SIMD support, fall back to plain memcmp and a home grown lowercase one */
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static inline int SCMemcmp(const void *s1, const void *s2, size_t n)
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{
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__m128i b1, b2;
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int r;
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/* counter for how far we already matched in the buffer */
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size_t m = 0;
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do {
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/* apparently we can't just read 16 bytes even though
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* it almost always works fine :) */
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if (likely(n - m < 16)) {
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return memcmp(s1, s2, n - m) ? 1 : 0;
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}
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/* load the buffers into the 128bit vars */
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b1 = _mm_loadu_si128((const __m128i *) s1);
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b2 = _mm_loadu_si128((const __m128i *) s2);
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/* do the actual compare */
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m += (r = _mm_cmpestri(b1, n - m, b2, 16,
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_SIDD_CMP_EQUAL_EACH | _SIDD_MASKED_NEGATIVE_POLARITY));
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s1 += 16;
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s2 += 16;
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} while (r == 16);
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return ((m == n) ? 0 : 1);
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}
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/* Range of values of uppercase characters. We only use the first 2 bytes. */
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static char scmemcmp_uppercase[16] __attribute__((aligned(16))) = {
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'A', 'Z', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, };
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/** \brief compare two buffers in a case insensitive way
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* \param s1 buffer already in lowercase
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* \param s2 buffer with mixed upper and lowercase
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*/
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static inline int SCMemcmpLowercase(const void *s1, const void *s2, size_t n)
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{
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__m128i b1, b2, mask;
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int r;
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/* counter for how far we already matched in the buffer */
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size_t m = 0;
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__m128i ucase = _mm_load_si128((const __m128i *) scmemcmp_uppercase);
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__m128i nulls = _mm_setzero_si128();
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__m128i uplow = _mm_set1_epi8(0x20);
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do {
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/* apparently we can't just read 16 bytes even though
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* it almost always works fine :) */
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if (likely(n - m < 16)) {
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return MemcmpLowercase(s1, s2, n - m);
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}
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b1 = _mm_loadu_si128((const __m128i *) s1);
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b2 = _mm_loadu_si128((const __m128i *) s2);
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size_t len = n - m;
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/* The first step is creating a mask that is FF for all uppercase
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* characters, 00 for all others */
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mask = _mm_cmpestrm(ucase, 2, b2, len, _SIDD_CMP_RANGES | _SIDD_UNIT_MASK);
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/* Next we use that mask to create a new: this one has 0x20 for
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* the uppercase chars, 00 for all other. */
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mask = _mm_blendv_epi8(nulls, uplow, mask);
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/* finally, merge the mask and the buffer converting the
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* uppercase to lowercase */
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b2 = _mm_add_epi8(b2, mask);
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/* search using our converted buffer */
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m += (r = _mm_cmpestri(b1, len, b2, 16,
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_SIDD_CMP_EQUAL_EACH | _SIDD_MASKED_NEGATIVE_POLARITY));
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s1 += 16;
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s2 += 16;
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} while (r == 16);
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return ((m == n) ? 0 : 1);
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}
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#elif defined(__SSE4_1__)
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#include <smmintrin.h>
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#define SCMEMCMP_BYTES 16
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static inline int SCMemcmp(const void *s1, const void *s2, size_t len)
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{
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size_t offset = 0;
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__m128i b1, b2, c;
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do {
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/* apparently we can't just read 16 bytes even though
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* it almost always works fine :) */
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if (likely(len - offset < 16)) {
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return memcmp(s1, s2, len - offset) ? 1 : 0;
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}
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/* do unaligned loads using _mm_loadu_si128. On my Core2 E6600 using
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* _mm_lddqu_si128 was about 2% slower even though it's supposed to
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* be faster. */
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b1 = _mm_loadu_si128((const __m128i *) s1);
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b2 = _mm_loadu_si128((const __m128i *) s2);
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c = _mm_cmpeq_epi8(b1, b2);
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int diff = len - offset;
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if (diff < 16) {
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int rmask = ~(0xFFFFFFFF << diff);
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if ((_mm_movemask_epi8(c) & rmask) != rmask) {
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return 1;
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}
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} else {
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if (_mm_movemask_epi8(c) != 0x0000FFFF) {
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return 1;
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}
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}
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offset += SCMEMCMP_BYTES;
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s1 += SCMEMCMP_BYTES;
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s2 += SCMEMCMP_BYTES;
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} while (len > offset);
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return 0;
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}
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#define UPPER_LOW 0x40 /* "A" - 1 */
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#define UPPER_HIGH 0x5B /* "Z" + 1 */
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static inline int SCMemcmpLowercase(const void *s1, const void *s2, size_t len)
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{
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size_t offset = 0;
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__m128i b1, b2, mask1, mask2, upper1, upper2, nulls, uplow;
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/* setup registers for upper to lower conversion */
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upper1 = _mm_set1_epi8(UPPER_LOW);
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upper2 = _mm_set1_epi8(UPPER_HIGH);
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nulls = _mm_setzero_si128();
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uplow = _mm_set1_epi8(0x20);
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do {
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/* apparently we can't just read 16 bytes even though
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* it almost always works fine :) */
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if (likely(len - offset < 16)) {
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return MemcmpLowercase(s1, s2, len - offset);
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}
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/* unaligned loading of the bytes to compare */
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b1 = _mm_loadu_si128((const __m128i *) s1);
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b2 = _mm_loadu_si128((const __m128i *) s2);
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/* mark all chars bigger than upper1 */
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mask1 = _mm_cmpgt_epi8(b2, upper1);
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/* mark all chars lower than upper2 */
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mask2 = _mm_cmplt_epi8(b2, upper2);
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/* merge the two, leaving only those that are true in both */
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mask1 = _mm_cmpeq_epi8(mask1, mask2);
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/* Next we use that mask to create a new: this one has 0x20 for
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* the uppercase chars, 00 for all other. */
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mask1 = _mm_blendv_epi8(nulls, uplow, mask1);
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/* add to b2, converting uppercase to lowercase */
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b2 = _mm_add_epi8(b2, mask1);
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/* now all is lowercase, let's do the actual compare (reuse mask1 reg) */
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mask1 = _mm_cmpeq_epi8(b1, b2);
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int diff = len - offset;
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if (diff < 16) {
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int rmask = ~(0xFFFFFFFF << diff);
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if ((_mm_movemask_epi8(mask1) & rmask) != rmask) {
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return 1;
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}
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} else {
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if (_mm_movemask_epi8(mask1) != 0x0000FFFF) {
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return 1;
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}
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}
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offset += SCMEMCMP_BYTES;
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s1 += SCMEMCMP_BYTES;
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s2 += SCMEMCMP_BYTES;
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} while (len > offset);
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return 0;
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}
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#elif defined(__SSE3__)
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#include <pmmintrin.h> /* for SSE3 */
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#define SCMEMCMP_BYTES 16
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static inline int SCMemcmp(const void *s1, const void *s2, size_t len)
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{
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size_t offset = 0;
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__m128i b1, b2, c;
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do {
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/* apparently we can't just read 16 bytes even though
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* it almost always works fine :) */
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if (likely(len - offset < 16)) {
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return memcmp(s1, s2, len - offset) ? 1 : 0;
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}
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/* do unaligned loads using _mm_loadu_si128. On my Core2 E6600 using
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* _mm_lddqu_si128 was about 2% slower even though it's supposed to
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* be faster. */
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b1 = _mm_loadu_si128((const __m128i *) s1);
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b2 = _mm_loadu_si128((const __m128i *) s2);
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c = _mm_cmpeq_epi8(b1, b2);
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int diff = len - offset;
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if (diff < 16) {
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int rmask = ~(0xFFFFFFFF << diff);
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if ((_mm_movemask_epi8(c) & rmask) != rmask) {
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return 1;
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}
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} else {
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if (_mm_movemask_epi8(c) != 0x0000FFFF) {
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return 1;
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}
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}
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offset += SCMEMCMP_BYTES;
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s1 += SCMEMCMP_BYTES;
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s2 += SCMEMCMP_BYTES;
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} while (len > offset);
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return 0;
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}
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#define UPPER_LOW 0x40 /* "A" - 1 */
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#define UPPER_HIGH 0x5B /* "Z" + 1 */
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#define UPPER_DELTA 0xDF /* 0xFF - 0x20 */
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static inline int SCMemcmpLowercase(const void *s1, const void *s2, size_t len)
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{
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size_t offset = 0;
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__m128i b1, b2, mask1, mask2, upper1, upper2, delta;
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/* setup registers for upper to lower conversion */
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upper1 = _mm_set1_epi8(UPPER_LOW);
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upper2 = _mm_set1_epi8(UPPER_HIGH);
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delta = _mm_set1_epi8(UPPER_DELTA);
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do {
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/* apparently we can't just read 16 bytes even though
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* it almost always works fine :) */
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if (likely(len - offset < 16)) {
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return MemcmpLowercase(s1, s2, len - offset);
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}
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/* unaligned loading of the bytes to compare */
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b1 = _mm_loadu_si128((const __m128i *) s1);
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b2 = _mm_loadu_si128((const __m128i *) s2);
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/* mark all chars bigger than upper1 */
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mask1 = _mm_cmpgt_epi8(b2, upper1);
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/* mark all chars lower than upper2 */
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mask2 = _mm_cmplt_epi8(b2, upper2);
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/* merge the two, leaving only those that are true in both */
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mask1 = _mm_cmpeq_epi8(mask1, mask2);
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/* sub delta leaves 0x20 only for uppercase positions, the
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rest is 0x00 due to the saturation (reuse mask1 reg)*/
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mask1 = _mm_subs_epu8(mask1, delta);
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/* add to b2, converting uppercase to lowercase */
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b2 = _mm_add_epi8(b2, mask1);
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/* now all is lowercase, let's do the actual compare (reuse mask1 reg) */
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mask1 = _mm_cmpeq_epi8(b1, b2);
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int diff = len - offset;
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if (diff < 16) {
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int rmask = ~(0xFFFFFFFF << diff);
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if ((_mm_movemask_epi8(mask1) & rmask) != rmask) {
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return 1;
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}
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} else {
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if (_mm_movemask_epi8(mask1) != 0x0000FFFF) {
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return 1;
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}
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}
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offset += SCMEMCMP_BYTES;
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s1 += SCMEMCMP_BYTES;
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s2 += SCMEMCMP_BYTES;
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} while (len > offset);
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return 0;
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}
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#else
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/* No SIMD support, fall back to plain memcmp and a home grown lowercase one */
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/* wrapper around memcmp to match the retvals of the SIMD implementations */
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#define SCMemcmp(a,b,c) ({ \
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memcmp((a), (b), (c)) ? 1 : 0; \
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})
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static inline int SCMemcmpLowercase(const void *s1, const void *s2, size_t len)
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{
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return MemcmpLowercase(s1, s2, len);
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}
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#endif /* SIMD */
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#endif /* __UTIL_MEMCMP_H__ */
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