Last change
on this file since 389 was 389, checked in by coas-nagasima, 5 years ago |
ビルドが通るよう更新
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Property svn:eol-style
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File size:
729 bytes
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[388] | 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 cosl(long double x) {
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| 5 | return cos(x);
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| 6 | }
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| 7 | #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
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| 8 | long double cosl(long double x)
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| 9 | {
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| 10 | union ldshape u = {x};
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| 11 | unsigned n;
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| 12 | long double y[2], hi, lo;
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| 13 |
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| 14 | u.i.se &= 0x7fff;
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| 15 | if (u.i.se == 0x7fff)
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| 16 | return x - x;
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| 17 | x = u.f;
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| 18 | if (x < M_PI_4) {
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| 19 | if (u.i.se < 0x3fff - LDBL_MANT_DIG)
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| 20 | /* raise inexact if x!=0 */
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| 21 | return 1.0 + x;
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| 22 | return __cosl(x, 0);
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| 23 | }
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| 24 | n = __rem_pio2l(x, y);
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| 25 | hi = y[0];
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| 26 | lo = y[1];
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| 27 | switch (n & 3) {
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| 28 | case 0:
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| 29 | return __cosl(hi, lo);
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| 30 | case 1:
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| 31 | return -__sinl(hi, lo, 1);
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| 32 | case 2:
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| 33 | return -__cosl(hi, lo);
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| 34 | case 3:
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| 35 | default:
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| 36 | return __sinl(hi, lo, 1);
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| 37 | }
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| 38 | }
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| 39 | #endif
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