vendor: OpenCV 5.0.0 snapshot at 40738fb16ceddb5fb3fea747585f7ce6abb0605b

2026-08-22 00:10:33 +08:00
commit f7f077da11
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+/*
+ * AVX2 optimized hash slide, based on Intel's slide_sse implementation
+ *
+ * Copyright (C) 2017 Intel Corporation
+ * Authors:
+ *   Arjan van de Ven   <arjan@linux.intel.com>
+ *   Jim Kukunas        <james.t.kukunas@linux.intel.com>
+ *   Mika T. Lindqvist  <postmaster@raasu.org>
+ *
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+#include "zbuild.h"
+#include "deflate.h"
+
+#include <immintrin.h>
+
+static inline void slide_hash_chain(Pos *table, uint32_t entries, const __m256i wsize) {
+    table += entries;
+    table -= 16;
+
+    do {
+        __m256i value, result;
+
+        value = _mm256_loadu_si256((__m256i *)table);
+        result = _mm256_subs_epu16(value, wsize);
+        _mm256_storeu_si256((__m256i *)table, result);
+
+        table -= 16;
+        entries -= 16;
+    } while (entries > 0);
+}
+
+Z_INTERNAL void slide_hash_avx2(deflate_state *s) {
+    uint16_t wsize = (uint16_t)s->w_size;
+    const __m256i ymm_wsize = _mm256_set1_epi16((short)wsize);
+
+    slide_hash_chain(s->head, HASH_SIZE, ymm_wsize);
+    slide_hash_chain(s->prev, wsize, ymm_wsize);
+}