mirror of
https://github.com/opencv/opencv.git
synced 2024-12-16 10:29:11 +08:00
32 lines
828 B
C
32 lines
828 B
C
|
/* 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);
|
||
|
|
}
|