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35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
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/* slide_hash_rvv.c - RVV version of slide_hash
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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 <riscv_vector.h>
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#include "../../zbuild.h"
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#include "../../deflate.h"
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static inline void slide_hash_chain(Pos *table, uint32_t entries, uint16_t wsize) {
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size_t vl;
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while (entries > 0) {
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vl = __riscv_vsetvl_e16m4(entries);
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vuint16m4_t v_tab = __riscv_vle16_v_u16m4(table, vl);
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vuint16m4_t v_diff = __riscv_vsub_vx_u16m4(v_tab, wsize, vl);
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vbool4_t mask = __riscv_vmsltu_vx_u16m4_b4(v_tab, wsize, vl);
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v_tab = __riscv_vmerge_vxm_u16m4(v_diff, 0, mask, vl);
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__riscv_vse16_v_u16m4(table, v_tab, vl);
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table += vl, entries -= vl;
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}
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}
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Z_INTERNAL void slide_hash_rvv(deflate_state *s) {
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uint16_t wsize = (uint16_t)s->w_size;
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slide_hash_chain(s->head, HASH_SIZE, wsize);
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slide_hash_chain(s->prev, wsize, wsize);
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}
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#endif // RISCV_RVV
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