1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
/* 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) {
Assert(s->w_size <= UINT16_MAX, "w_size should fit in uint16_t");
uint16_t wsize = (uint16_t)s->w_size;
slide_hash_chain(s->head, HASH_SIZE, wsize);
slide_hash_chain(s->prev, wsize, wsize);
}
|
