Last change
on this file since 380 was 352, checked in by coas-nagasima, 6 years ago |
arm向け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:
653 bytes
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Rev | Line | |
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[352] | 1 | #include "libm.h"
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| 2 |
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| 3 | #if FLT_EVAL_METHOD==0 || FLT_EVAL_METHOD==1
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| 4 | #define EPS DBL_EPSILON
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| 5 | #elif FLT_EVAL_METHOD==2
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| 6 | #define EPS LDBL_EPSILON
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| 7 | #endif
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| 8 | static const double_t toint = 1/EPS;
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| 9 |
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| 10 | double floor(double x)
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| 11 | {
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| 12 | union {double f; uint64_t i;} u = {x};
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| 13 | int e = u.i >> 52 & 0x7ff;
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| 14 | double_t y;
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| 15 |
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| 16 | if (e >= 0x3ff+52 || x == 0)
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| 17 | return x;
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| 18 | /* y = int(x) - x, where int(x) is an integer neighbor of x */
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| 19 | if (u.i >> 63)
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| 20 | y = x - toint + toint - x;
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| 21 | else
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| 22 | y = x + toint - toint - x;
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| 23 | /* special case because of non-nearest rounding modes */
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| 24 | if (e <= 0x3ff-1) {
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| 25 | FORCE_EVAL(y);
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| 26 | return u.i >> 63 ? -1 : 0;
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| 27 | }
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| 28 | if (y > 0)
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| 29 | return x + y - 1;
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| 30 | return x + y;
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| 31 | }
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