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0de26fd78e
Zlib-ng is zlib replacement with optimizations for "next generation" systems. Its optimization may benifits image library decode and encode speed such as libpng. In our tests, if using zlib-ng and libpng combination on a x86_64 machine with AVX2, the time of `imdecode` amd `imencode` will drop 20% approximately. This patch enables zlib-ng's optimization if `CV_DISABLE_OPTIMIZATION` is OFF. Since Zlib-ng can dispatch intrinsics on the fly, port work is much easier. Related discussion: https://github.com/opencv/opencv/issues/22573
32 lines
828 B
C
32 lines
828 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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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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