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28 lines
556 B
28 lines
556 B
#include <limits.h>
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#include "libm.h"
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#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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int ilogbl(long double x)
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{
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return ilogb(x);
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}
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#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
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int ilogbl(long double x)
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{
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union ldshape u = {x};
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uint64_t m = u.bits.m;
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int e = u.bits.exp;
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if (!e) {
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if (m == 0)
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return FP_ILOGB0;
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/* subnormal x */
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for (e = -0x3fff+1; m < (uint64_t)1<<63; e--, m<<=1);
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return e;
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}
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if (e == 0x7fff)
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/* in ld80 msb is set in inf */
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return m & (uint64_t)-1>>1 ? FP_ILOGBNAN : INT_MAX;
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return e - 0x3fff;
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}
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#endif
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