mirror of
https://github.com/opencv/opencv.git
synced 2024-12-16 10:29:11 +08:00
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
58 lines
2.3 KiB
C
58 lines
2.3 KiB
C
/* crc32_braid_comb.c -- compute the CRC-32 of a data stream
|
|
* Copyright (C) 1995-2022 Mark Adler
|
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
|
*
|
|
* This interleaved implementation of a CRC makes use of pipelined multiple
|
|
* arithmetic-logic units, commonly found in modern CPU cores. It is due to
|
|
* Kadatch and Jenkins (2010). See doc/crc-doc.1.0.pdf in this distribution.
|
|
*/
|
|
|
|
#include "zbuild.h"
|
|
#include "zutil.h"
|
|
#include "crc32_braid_p.h"
|
|
#include "crc32_braid_tbl.h"
|
|
#include "crc32_braid_comb_p.h"
|
|
|
|
/* ========================================================================= */
|
|
static uint32_t crc32_combine_(uint32_t crc1, uint32_t crc2, z_off64_t len2) {
|
|
return multmodp(x2nmodp(len2, 3), crc1) ^ crc2;
|
|
}
|
|
static uint32_t crc32_combine_gen_(z_off64_t len2) {
|
|
return x2nmodp(len2, 3);
|
|
}
|
|
static uint32_t crc32_combine_op_(uint32_t crc1, uint32_t crc2, const uint32_t op) {
|
|
return multmodp(op, crc1) ^ crc2;
|
|
}
|
|
|
|
/* ========================================================================= */
|
|
|
|
#ifdef ZLIB_COMPAT
|
|
unsigned long Z_EXPORT PREFIX(crc32_combine)(unsigned long crc1, unsigned long crc2, z_off_t len2) {
|
|
return (unsigned long)crc32_combine_((uint32_t)crc1, (uint32_t)crc2, len2);
|
|
}
|
|
unsigned long Z_EXPORT PREFIX4(crc32_combine)(unsigned long crc1, unsigned long crc2, z_off64_t len2) {
|
|
return (unsigned long)crc32_combine_((uint32_t)crc1, (uint32_t)crc2, len2);
|
|
}
|
|
unsigned long Z_EXPORT PREFIX(crc32_combine_gen)(z_off_t len2) {
|
|
return crc32_combine_gen_(len2);
|
|
}
|
|
unsigned long Z_EXPORT PREFIX4(crc32_combine_gen)(z_off64_t len2) {
|
|
return crc32_combine_gen_(len2);
|
|
}
|
|
unsigned long Z_EXPORT PREFIX(crc32_combine_op)(unsigned long crc1, unsigned long crc2, const unsigned long op) {
|
|
return (unsigned long)crc32_combine_op_((uint32_t)crc1, (uint32_t)crc2, (uint32_t)op);
|
|
}
|
|
#else
|
|
uint32_t Z_EXPORT PREFIX4(crc32_combine)(uint32_t crc1, uint32_t crc2, z_off64_t len2) {
|
|
return crc32_combine_(crc1, crc2, len2);
|
|
}
|
|
uint32_t Z_EXPORT PREFIX(crc32_combine_gen)(z_off64_t len2) {
|
|
return crc32_combine_gen_(len2);
|
|
}
|
|
uint32_t Z_EXPORT PREFIX(crc32_combine_op)(uint32_t crc1, uint32_t crc2, const uint32_t op) {
|
|
return crc32_combine_op_(crc1, crc2, op);
|
|
}
|
|
#endif
|
|
|
|
/* ========================================================================= */
|