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