[352] | 1 | #include <float.h>
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| 2 | #include "__invtrigl.h"
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| 3 |
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| 4 | #if LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
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| 5 | static const long double
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| 6 | pS0 = 1.66666666666666666631e-01L,
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| 7 | pS1 = -4.16313987993683104320e-01L,
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| 8 | pS2 = 3.69068046323246813704e-01L,
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| 9 | pS3 = -1.36213932016738603108e-01L,
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| 10 | pS4 = 1.78324189708471965733e-02L,
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| 11 | pS5 = -2.19216428382605211588e-04L,
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| 12 | pS6 = -7.10526623669075243183e-06L,
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| 13 | qS1 = -2.94788392796209867269e+00L,
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| 14 | qS2 = 3.27309890266528636716e+00L,
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| 15 | qS3 = -1.68285799854822427013e+00L,
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| 16 | qS4 = 3.90699412641738801874e-01L,
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| 17 | qS5 = -3.14365703596053263322e-02L;
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| 18 |
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| 19 | const long double pio2_hi = 1.57079632679489661926L;
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| 20 | const long double pio2_lo = -2.50827880633416601173e-20L;
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| 21 |
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| 22 | /* used in asinl() and acosl() */
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| 23 | /* R(x^2) is a rational approximation of (asin(x)-x)/x^3 with Remez algorithm */
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| 24 | long double __invtrigl_R(long double z)
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| 25 | {
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| 26 | long double p, q;
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| 27 | p = z*(pS0+z*(pS1+z*(pS2+z*(pS3+z*(pS4+z*(pS5+z*pS6))))));
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| 28 | q = 1.0+z*(qS1+z*(qS2+z*(qS3+z*(qS4+z*qS5))));
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| 29 | return p/q;
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| 30 | }
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| 31 | #elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
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| 32 | static const long double
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| 33 | pS0 = 1.66666666666666666666666666666700314e-01L,
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| 34 | pS1 = -7.32816946414566252574527475428622708e-01L,
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| 35 | pS2 = 1.34215708714992334609030036562143589e+00L,
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| 36 | pS3 = -1.32483151677116409805070261790752040e+00L,
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| 37 | pS4 = 7.61206183613632558824485341162121989e-01L,
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| 38 | pS5 = -2.56165783329023486777386833928147375e-01L,
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| 39 | pS6 = 4.80718586374448793411019434585413855e-02L,
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| 40 | pS7 = -4.42523267167024279410230886239774718e-03L,
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| 41 | pS8 = 1.44551535183911458253205638280410064e-04L,
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| 42 | pS9 = -2.10558957916600254061591040482706179e-07L,
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| 43 | qS1 = -4.84690167848739751544716485245697428e+00L,
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| 44 | qS2 = 9.96619113536172610135016921140206980e+00L,
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| 45 | qS3 = -1.13177895428973036660836798461641458e+01L,
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| 46 | qS4 = 7.74004374389488266169304117714658761e+00L,
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| 47 | qS5 = -3.25871986053534084709023539900339905e+00L,
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| 48 | qS6 = 8.27830318881232209752469022352928864e-01L,
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| 49 | qS7 = -1.18768052702942805423330715206348004e-01L,
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| 50 | qS8 = 8.32600764660522313269101537926539470e-03L,
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| 51 | qS9 = -1.99407384882605586705979504567947007e-04L;
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| 52 |
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| 53 | const long double pio2_hi = 1.57079632679489661923132169163975140L;
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| 54 | const long double pio2_lo = 4.33590506506189051239852201302167613e-35L;
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| 55 |
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| 56 | long double __invtrigl_R(long double z)
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| 57 | {
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| 58 | long double p, q;
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| 59 | p = z*(pS0+z*(pS1+z*(pS2+z*(pS3+z*(pS4+z*(pS5+z*(pS6+z*(pS7+z*(pS8+z*pS9)))))))));
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| 60 | q = 1.0+z*(qS1+z*(qS2+z*(qS3+z*(qS4+z*(qS5+z*(qS6+z*(qS7+z*(qS8+z*qS9))))))));
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| 61 | return p/q;
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| 62 | }
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| 63 | #endif
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