Last change
on this file since 367 was 337, checked in by coas-nagasima, 6 years ago |
ASP3版ECNLを追加
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Property svn:eol-style
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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:
489 bytes
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Rev | Line | |
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[337] | 1 | #include <float.h>
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| 2 | #include <math.h>
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| 3 | #include <stdint.h>
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| 4 |
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| 5 | #if FLT_EVAL_METHOD==0 || FLT_EVAL_METHOD==1
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| 6 | #define EPS DBL_EPSILON
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| 7 | #elif FLT_EVAL_METHOD==2
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| 8 | #define EPS LDBL_EPSILON
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| 9 | #endif
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| 10 | static const double_t toint = 1/EPS;
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| 11 |
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| 12 | double rint(double x)
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| 13 | {
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| 14 | union {double f; uint64_t i;} u = {x};
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| 15 | int e = u.i>>52 & 0x7ff;
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| 16 | int s = u.i>>63;
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| 17 | double_t y;
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| 18 |
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| 19 | if (e >= 0x3ff+52)
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| 20 | return x;
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| 21 | if (s)
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| 22 | y = x - toint + toint;
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| 23 | else
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| 24 | y = x + toint - toint;
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| 25 | if (y == 0)
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| 26 | return s ? -0.0 : 0;
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| 27 | return y;
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| 28 | }
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