Last change
on this file was 444, checked in by coas-nagasima, 4 years ago |
muslのソースコードを追加
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Property svn:eol-style
set to
native
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Property svn:mime-type
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text/x-csrc;charset=UTF-8
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File size:
536 bytes
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Rev | Line | |
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[444] | 1 | #include "libm.h"
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| 2 |
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| 3 | double modf(double x, double *iptr)
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| 4 | {
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| 5 | union {double f; uint64_t i;} u = {x};
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| 6 | uint64_t mask;
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| 7 | int e = (int)(u.i>>52 & 0x7ff) - 0x3ff;
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| 8 |
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| 9 | /* no fractional part */
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| 10 | if (e >= 52) {
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| 11 | *iptr = x;
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| 12 | if (e == 0x400 && u.i<<12 != 0) /* nan */
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| 13 | return x;
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| 14 | u.i &= 1ULL<<63;
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| 15 | return u.f;
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| 16 | }
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| 17 |
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| 18 | /* no integral part*/
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| 19 | if (e < 0) {
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| 20 | u.i &= 1ULL<<63;
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| 21 | *iptr = u.f;
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| 22 | return x;
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| 23 | }
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| 24 |
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| 25 | mask = -1ULL>>12>>e;
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| 26 | if ((u.i & mask) == 0) {
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| 27 | *iptr = x;
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| 28 | u.i &= 1ULL<<63;
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| 29 | return u.f;
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| 30 | }
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| 31 | u.i &= ~mask;
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| 32 | *iptr = u.f;
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| 33 | return x - u.f;
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| 34 | }
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