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31 lines
828 B
31 lines
828 B
/* 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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uint16_t wsize = 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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