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37 lines
588 B
37 lines
588 B
#include <math.h>
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#include <stdint.h>
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#include <float.h>
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#if LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
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/* This version is for 80-bit little endian long double */
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long double frexpl(long double x, int *e)
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{
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union { long double ld; uint16_t hw[5]; } y = { x };
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int ee = y.hw[4]&0x7fff;
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if (!ee) {
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if (x) {
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x = frexpl(x*0x1p64, e);
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*e -= 64;
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} else *e = 0;
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return x;
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} else if (ee == 0x7fff) {
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return x;
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}
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*e = ee - 0x3ffe;
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y.hw[4] &= 0x8000;
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y.hw[4] |= 0x3ffe;
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return y.ld;
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}
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#else
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long double frexpl(long double x, int *e)
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{
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return frexp(x, e);
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}
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#endif
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