vendor: OpenCV 5.0.0 snapshot at 40738fb16ceddb5fb3fea747585f7ce6abb0605b

2026-08-22 00:10:33 +08:00
commit f7f077da11
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+/* compare256_rvv.c - RVV version of compare256
+ * Copyright (C) 2023 SiFive, Inc. All rights reserved.
+ * Contributed by Alex Chiang <alex.chiang@sifive.com>
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#ifdef RISCV_RVV
+
+#include "zbuild.h"
+#include "zutil_p.h"
+#include "deflate.h"
+#include "fallback_builtins.h"
+
+#include <riscv_vector.h>
+
+static inline uint32_t compare256_rvv_static(const uint8_t *src0, const uint8_t *src1) {
+    uint32_t len = 0;
+    size_t vl;
+    long found_diff;
+    do {
+        vl = __riscv_vsetvl_e8m4(256 - len);
+        vuint8m4_t v_src0 = __riscv_vle8_v_u8m4(src0, vl);
+        vuint8m4_t v_src1 = __riscv_vle8_v_u8m4(src1, vl);
+        vbool2_t v_mask = __riscv_vmsne_vv_u8m4_b2(v_src0, v_src1, vl);
+        found_diff = __riscv_vfirst_m_b2(v_mask, vl);
+        if (found_diff >= 0)
+            return len + (uint32_t)found_diff;
+        src0 += vl, src1 += vl, len += vl;
+    } while (len < 256);
+
+    return 256;
+}
+
+Z_INTERNAL uint32_t compare256_rvv(const uint8_t *src0, const uint8_t *src1) {
+    return compare256_rvv_static(src0, src1);
+}
+
+#define LONGEST_MATCH       longest_match_rvv
+#define COMPARE256          compare256_rvv_static
+
+#include "match_tpl.h"
+
+#define LONGEST_MATCH_SLOW
+#define LONGEST_MATCH       longest_match_slow_rvv
+#define COMPARE256          compare256_rvv_static
+
+#include "match_tpl.h"
+
+#endif // RISCV_RVV