vendor: OpenCV 5.0.0 snapshot at 40738fb16ceddb5fb3fea747585f7ce6abb0605b

2026-08-22 00:10:33 +08:00
commit f7f077da11
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+/* adler32_avx2_p.h -- adler32 avx2 utility functions
+ * Copyright (C) 2022 Adam Stylinski
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#ifndef ADLER32_AVX2_P_H_
+#define ADLER32_AVX2_P_H_
+
+#if defined(X86_AVX2) || defined(X86_AVX512VNNI)
+
+/* 32 bit horizontal sum, adapted from Agner Fog's vector library. */
+static inline uint32_t hsum256(__m256i x) {
+    __m128i sum1  = _mm_add_epi32(_mm256_extracti128_si256(x, 1),
+                                  _mm256_castsi256_si128(x));
+    __m128i sum2  = _mm_add_epi32(sum1, _mm_unpackhi_epi64(sum1, sum1));
+    __m128i sum3  = _mm_add_epi32(sum2, _mm_shuffle_epi32(sum2, 1));
+    return (uint32_t)_mm_cvtsi128_si32(sum3);
+}
+
+static inline uint32_t partial_hsum256(__m256i x) {
+    /* We need a permutation vector to extract every other integer. The
+     * rest are going to be zeros */
+    const __m256i perm_vec = _mm256_setr_epi32(0, 2, 4, 6, 1, 1, 1, 1);
+    __m256i non_zero = _mm256_permutevar8x32_epi32(x, perm_vec);
+    __m128i non_zero_sse = _mm256_castsi256_si128(non_zero);
+    __m128i sum2  = _mm_add_epi32(non_zero_sse,_mm_unpackhi_epi64(non_zero_sse, non_zero_sse));
+    __m128i sum3  = _mm_add_epi32(sum2, _mm_shuffle_epi32(sum2, 1));
+    return (uint32_t)_mm_cvtsi128_si32(sum3);
+}
+#endif
+
+#endif