mirror of
https://github.com/VectorCamp/vectorscan.git
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132 lines
5.0 KiB
C
132 lines
5.0 KiB
C
/*
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* Copyright (c) 2015-2017, Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* noodle scan parts for SSE */
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static really_inline m128 getMask(u8 c, bool noCase) {
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u8 k = caseClear8(c, noCase);
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return set1_16x8(k);
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}
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static really_inline m128 getCaseMask(void) {
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return set1_16x8(0xdf);
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}
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static really_inline
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hwlm_error_t scanSingleUnaligned(const struct noodTable *n, const u8 *buf,
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size_t len, size_t offset, m128 caseMask, m128 mask1,
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const struct cb_info *cbi, size_t start,
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size_t end) {
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const u8 *d = buf + offset;
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DEBUG_PRINTF("start %zu end %zu offset %zu\n", start, end, offset);
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const size_t l = end - start;
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m128 v = and128(loadu128(d), caseMask);
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u32 buf_off = start - offset;
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u32 mask = ((1 << l) - 1) << buf_off;
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u32 z = mask & movemask128(eq128(mask1, v));
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DEBUG_PRINTF("mask 0x%08x z 0x%08x\n", mask, z);
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return single_zscan(n, d, buf, &z, len, cbi);
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}
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static really_inline
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hwlm_error_t scanDoubleUnaligned(const struct noodTable *n, const u8 *buf,
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size_t len, size_t offset,
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m128 caseMask, m128 mask1, m128 mask2,
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const struct cb_info *cbi, size_t start,
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size_t end) {
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const u8 *d = buf + offset;
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DEBUG_PRINTF("start %zu end %zu offset %zu\n", start, end, offset);
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size_t l = end - start;
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u32 buf_off = start - offset;
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m128 v = and128(loadu128(d), caseMask);
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// mask out where we can't match
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u32 mask = ((1 << l) - 1) << buf_off;
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u32 z = mask & movemask128(and128(lshiftbyte_m128(eq128(mask1, v), 1), eq128(mask2, v)));
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DEBUG_PRINTF("mask 0x%08x z 0x%08x\n", mask, z);
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return double_zscan(n, d, buf, &z, len, cbi);
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}
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static really_inline
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hwlm_error_t scanSingleFast(const struct noodTable *n, const u8 *buf,
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size_t len, m128 caseMask, m128 mask1,
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const struct cb_info *cbi, size_t start,
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size_t end) {
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const u8 *d = buf + start, *e = buf + end;
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assert(d < e);
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const u8 *base = ROUNDDOWN_PTR(d, 64);
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for (; d < e; d += 16) {
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m128 v = and128(load128(d), caseMask);
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u32 z = movemask128(eq128(mask1, v));
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// On large packet buffers, this prefetch appears to get us about 2%.
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__builtin_prefetch(base + 128);
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DEBUG_PRINTF("z 0x%08x\n", z);
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hwlm_error_t result = single_zscan(n, d, buf, &z, len, cbi);
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if (unlikely(result != HWLM_SUCCESS))
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return result;
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}
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return HWLM_SUCCESS;
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}
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static really_inline
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hwlm_error_t scanDoubleFast(const struct noodTable *n, const u8 *buf,
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size_t len, m128 caseMask, m128 mask1,
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m128 mask2, const struct cb_info *cbi, size_t start,
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size_t end) {
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const u8 *d = buf + start, *e = buf + end;
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assert(d < e);
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m128 lastz1 = zeroes128();
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const u8 *base = ROUNDDOWN_PTR(d, 64);
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for (; d < e; d += 16) {
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m128 v = and128(load128(d), caseMask);
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m128 z1 = eq128(mask1, v);
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m128 z2 = eq128(mask2, v);
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u32 z = movemask128(and128(palignr(z1, lastz1, 15), z2));
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lastz1 = z1;
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// On large packet buffers, this prefetch appears to get us about 2%.
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__builtin_prefetch(base + 128);
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DEBUG_PRINTF("z 0x%08x\n", z);
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hwlm_error_t result = double_zscan(n, d, buf, &z, len, cbi);
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if (unlikely(result != HWLM_SUCCESS))
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return result;
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}
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return HWLM_SUCCESS;
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}
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