| /* Optimized slide_hash for PowerPC processors |
| * Copyright (C) 2017-2021 Mika T. Lindqvist <postmaster@raasu.org> |
| * For conditions of distribution and use, see copyright notice in zlib.h |
| */ |
| |
| #include <altivec.h> |
| #include "zbuild.h" |
| #include "deflate.h" |
| |
| static inline void slide_hash_chain(Pos *table, uint32_t entries, uint16_t wsize) { |
| const vector unsigned short vmx_wsize = vec_splats(wsize); |
| Pos *p = table; |
| |
| do { |
| vector unsigned short value, result; |
| |
| value = vec_ld(0, p); |
| result = vec_subs(value, vmx_wsize); |
| vec_st(result, 0, p); |
| |
| p += 8; |
| entries -= 8; |
| } while (entries > 0); |
| } |
| |
| void Z_INTERNAL SLIDE_PPC(deflate_state *s) { |
| uint16_t wsize = s->w_size; |
| |
| slide_hash_chain(s->head, HASH_SIZE, wsize); |
| slide_hash_chain(s->prev, wsize, wsize); |
| } |