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[checksum] use multiple threads and double buffering

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* Can reduce the duration of checksum computations by about
  1/3rd, if you have quad core CPU or better.
This commit is contained in:
Pete Batard 2016-02-29 21:36:28 +00:00
parent bab3453f4d
commit e6d3653cac
5 changed files with 185 additions and 33 deletions
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16
src/missing.h
View file

@ -21,6 +21,7 @@
#include <commctrl.h>
#include <shlobj.h>
#include <wininet.h>
#include <stdint.h>
#pragma once
@ -44,6 +45,21 @@
#define bswap_uint16 __builtin_bswap16
#endif
/*
* Nibbled from https://github.com/hanji/popcnt/blob/master/populationcount.cpp
* Since MSVC x86_32 does not have intrinsic popcount64 and I don't have all day
*/
static inline int popcnt64(register uint64_t u)
{
u = (u & 0x5555555555555555) + ((u >> 1) & 0x5555555555555555);
u = (u & 0x3333333333333333) + ((u >> 2) & 0x3333333333333333);
u = (u & 0x0f0f0f0f0f0f0f0f) + ((u >> 4) & 0x0f0f0f0f0f0f0f0f);
u = (u & 0x00ff00ff00ff00ff) + ((u >> 8) & 0x00ff00ff00ff00ff);
u = (u & 0x0000ffff0000ffff) + ((u >> 16) & 0x0000ffff0000ffff);
u = (u & 0x00000000ffffffff) + ((u >> 32) & 0x00000000ffffffff);
return (int)u;
}
static __inline void *_reallocf(void *ptr, size_t size) {
void *ret = realloc(ptr, size);
if (!ret)