mirror of
https://github.com/golang/go
synced 2024-11-22 21:10:03 -07:00
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/*
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
* Neither the name of "The Computer Language Benchmarks Game" nor the
|
|
name of "The Computer Language Shootout Benchmarks" nor the names of
|
|
its contributors may be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/* The Computer Language Shootout
|
|
http://shootout.alioth.debian.org/
|
|
|
|
contributed by Greg Buchholz
|
|
|
|
for the debian (AMD) machine...
|
|
compile flags: -O3 -ffast-math -march=athlon-xp -funroll-loops
|
|
|
|
for the gp4 (Intel) machine...
|
|
compile flags: -O3 -ffast-math -march=pentium4 -funroll-loops
|
|
*/
|
|
|
|
#include<stdio.h>
|
|
|
|
int main (int argc, char **argv)
|
|
{
|
|
int w, h, bit_num = 0;
|
|
char byte_acc = 0;
|
|
int i, iter = 50;
|
|
double x, y, limit = 2.0;
|
|
double Zr, Zi, Cr, Ci, Tr, Ti;
|
|
|
|
w = h = atoi(argv[1]);
|
|
|
|
printf("P4\n%d %d\n",w,h);
|
|
|
|
for(y=0;y<h;++y)
|
|
{
|
|
for(x=0;x<w;++x)
|
|
{
|
|
Zr = Zi = Tr = Ti = 0.0;
|
|
Cr = (2.0*x/w - 1.5); Ci=(2.0*y/h - 1.0);
|
|
|
|
for (i=0;i<iter && (Tr+Ti <= limit*limit);++i)
|
|
{
|
|
Zi = 2.0*Zr*Zi + Ci;
|
|
Zr = Tr - Ti + Cr;
|
|
Tr = Zr * Zr;
|
|
Ti = Zi * Zi;
|
|
}
|
|
|
|
byte_acc <<= 1;
|
|
if(Tr+Ti <= limit*limit) byte_acc |= 0x01;
|
|
|
|
++bit_num;
|
|
|
|
if(bit_num == 8)
|
|
{
|
|
putc(byte_acc,stdout);
|
|
byte_acc = 0;
|
|
bit_num = 0;
|
|
}
|
|
else if(x == w-1)
|
|
{
|
|
byte_acc <<= (8-w%8);
|
|
putc(byte_acc,stdout);
|
|
byte_acc = 0;
|
|
bit_num = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|