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#if 0
#define TGSOURCE "log2.c"
#include "_tgmath.h"
#include <math.h>
#include <fenv.h>
TYPE TGFN(log2)(TYPE x)
{
switch (fpclassify(x)) {
case FP_ZERO: feraiseexcept(FE_DIVBYZERO); return - INFINITY;
case FP_INFINITE: if (!signbit(x)) { return x; } break;
default: break;
}
if (x == 1.0) {
return 0.0;
}
if (x < 0.0) {
feraiseexcept(FE_INVALID);
return NAN;
}
return x;
}
/*
STDC(199901)
LINK(m)
*/
#endif
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