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