Performance improvements for 64 bit data.

[jacob navia]

I have speeded up the performance of 64 bit data handling in the
32 bit version.

Using the following program:
--------------------------------------------------
#include <stdio.h>

#if _WIN32
typedef unsigned __int64 ullong_t;
#else
typedef unsigned long long ullong_t;
#endif

static ullong_t x = 1234567890987654321/*ULL*/;
static ullong_t c = 123456123456123456/*ULL*/;
static ullong_t y = 362436362436362436/*ULL*/;
static ullong_t z = 1066149217761810/*ULL*/;
static ullong_t t;

#define MWC (t = (x<<58)+c, c = (x>>6), x+=t, c+=(x<t), x)
#define XSH (y ^= (y<<13), y ^= (y>>17), y ^= (y<<43))
#define CNG (z = 6906969069/*LL*/ * z + 1234567)
#define KISS (MWC + XSH + CNG)

int main(void)
{
int i;

for (i = 0; i < 100000000; i++)
t = KISS;

if (t == 1666297717051644203/*ULL*/)
printf("100 million uses of KISS OK");
else
printf("Fail");
return 0;
}
---------------------------------------------------

I get the following results:

Pelles-c -Ox 3.712
lcc-win -O 2.7 seconds
MSVC -Ox 2.55 seconds
gcc -O2 2.0

The difference between MSVC and lcc-win is that lcc-win uses
2 temporary variables in memory, and MSVC only registers.

Gcc is in another league... it maintains 2 64 bit variables
in the registerss at the same time... Amazing.

The new version should be available shortly. I have uploaded
tonight.
--
jacob navia
jacob at jacob point remcomp point fr
logiciels/informatique
http://www.cs.virginia.edu/~lcc-win32