68b2e7f763
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33 lines
908 B
C
33 lines
908 B
C
/* Optimized slide_hash for PowerPC processors
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* Copyright (C) 2017-2021 Mika T. Lindqvist <postmaster@raasu.org>
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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#include <altivec.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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const vector unsigned short vmx_wsize = vec_splats(wsize);
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Pos *p = table;
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do {
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vector unsigned short value, result;
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value = vec_ld(0, p);
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result = vec_subs(value, vmx_wsize);
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vec_st(result, 0, p);
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p += 8;
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entries -= 8;
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} while (entries > 0);
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}
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void Z_INTERNAL SLIDE_PPC(deflate_state *s) {
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Assert(s->w_size <= UINT16_MAX, "w_size should fit in uint16_t");
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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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