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https://git.code.sf.net/p/quake/quakeforge
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c1c77bd64a
This is for developing methods of implementing geometric algebra and eventually playing with it visually.
40 lines
618 B
R
40 lines
618 B
R
#include <runtime.h>
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#include "util.h"
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void printf(string fmt, ...) = #0;
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void traceon(void) = #0;
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void traceoff(void) = #0;
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int *
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binomial (int n)
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{
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int *coef = obj_malloc ((n + 1) * sizeof (int));
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int c = 1;
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for (int i = 0; i < n + 1; i++) {
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coef[i] = c;
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c = (c * (n - i)) / (i + 1);
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}
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return coef;
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}
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int
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count_bits (unsigned v)
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{
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int c = 0;
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for (; v; c++) {
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v &= v - 1u; //XXX bug in qfcc: just 1 results in extra temp
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}
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return c;
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}
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int
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count_flips (unsigned a, unsigned b)
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{
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int c = 0;
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a >>= 1;
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while (a) {
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c += count_bits (a & b);
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a >>= 1;
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}
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return c;
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}
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