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This commit is contained in:
Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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26
libc/math/ilogb.c Normal file
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#include "libc/limits.h"
#include "libc/math/libm.h"
int ilogb(double x)
{
#pragma STDC FENV_ACCESS ON
union {double f; uint64_t i;} u = {x};
uint64_t i = u.i;
int e = i>>52 & 0x7ff;
if (!e) {
i <<= 12;
if (i == 0) {
FORCE_EVAL(0/0.0f);
return FP_ILOGB0;
}
/* subnormal x */
for (e = -0x3ff; i>>63 == 0; e--, i<<=1);
return e;
}
if (e == 0x7ff) {
FORCE_EVAL(0/0.0f);
return i<<12 ? FP_ILOGBNAN : INT_MAX;
}
return e - 0x3ff;
}