Last change
on this file since 352 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:
668 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 LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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| 4 | long double truncl(long double x)
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| 5 | {
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| 6 | return trunc(x);
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| 7 | }
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| 8 | #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
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| 9 |
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| 10 | static const long double toint = 1/LDBL_EPSILON;
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| 11 |
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| 12 | long double truncl(long double x)
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| 13 | {
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| 14 | union ldshape u = {x};
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| 15 | int e = u.i.se & 0x7fff;
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| 16 | int s = u.i.se >> 15;
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| 17 | long double y;
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| 18 |
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| 19 | if (e >= 0x3fff+LDBL_MANT_DIG-1)
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| 20 | return x;
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| 21 | if (e <= 0x3fff-1) {
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| 22 | FORCE_EVAL(x + 0x1p120f);
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| 23 | return x*0;
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| 24 | }
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| 25 | /* y = int(|x|) - |x|, where int(|x|) is an integer neighbor of |x| */
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| 26 | if (s)
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| 27 | x = -x;
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| 28 | y = x + toint - toint - x;
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| 29 | if (y > 0)
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| 30 | y -= 1;
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| 31 | x += y;
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| 32 | return s ? -x : x;
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| 33 | }
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| 34 | #endif
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