1570af302Sopenharmony_ci#include <float.h> 2570af302Sopenharmony_ci#include "__invtrigl.h" 3570af302Sopenharmony_ci 4570af302Sopenharmony_ci#if LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 5570af302Sopenharmony_cistatic const long double 6570af302Sopenharmony_cipS0 = 1.66666666666666666631e-01L, 7570af302Sopenharmony_cipS1 = -4.16313987993683104320e-01L, 8570af302Sopenharmony_cipS2 = 3.69068046323246813704e-01L, 9570af302Sopenharmony_cipS3 = -1.36213932016738603108e-01L, 10570af302Sopenharmony_cipS4 = 1.78324189708471965733e-02L, 11570af302Sopenharmony_cipS5 = -2.19216428382605211588e-04L, 12570af302Sopenharmony_cipS6 = -7.10526623669075243183e-06L, 13570af302Sopenharmony_ciqS1 = -2.94788392796209867269e+00L, 14570af302Sopenharmony_ciqS2 = 3.27309890266528636716e+00L, 15570af302Sopenharmony_ciqS3 = -1.68285799854822427013e+00L, 16570af302Sopenharmony_ciqS4 = 3.90699412641738801874e-01L, 17570af302Sopenharmony_ciqS5 = -3.14365703596053263322e-02L; 18570af302Sopenharmony_ci 19570af302Sopenharmony_ciconst long double pio2_hi = 1.57079632679489661926L; 20570af302Sopenharmony_ciconst long double pio2_lo = -2.50827880633416601173e-20L; 21570af302Sopenharmony_ci 22570af302Sopenharmony_ci/* used in asinl() and acosl() */ 23570af302Sopenharmony_ci/* R(x^2) is a rational approximation of (asin(x)-x)/x^3 with Remez algorithm */ 24570af302Sopenharmony_cilong double __invtrigl_R(long double z) 25570af302Sopenharmony_ci{ 26570af302Sopenharmony_ci long double p, q; 27570af302Sopenharmony_ci p = z*(pS0+z*(pS1+z*(pS2+z*(pS3+z*(pS4+z*(pS5+z*pS6)))))); 28570af302Sopenharmony_ci q = 1.0+z*(qS1+z*(qS2+z*(qS3+z*(qS4+z*qS5)))); 29570af302Sopenharmony_ci return p/q; 30570af302Sopenharmony_ci} 31570af302Sopenharmony_ci#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384 32570af302Sopenharmony_cistatic const long double 33570af302Sopenharmony_cipS0 = 1.66666666666666666666666666666700314e-01L, 34570af302Sopenharmony_cipS1 = -7.32816946414566252574527475428622708e-01L, 35570af302Sopenharmony_cipS2 = 1.34215708714992334609030036562143589e+00L, 36570af302Sopenharmony_cipS3 = -1.32483151677116409805070261790752040e+00L, 37570af302Sopenharmony_cipS4 = 7.61206183613632558824485341162121989e-01L, 38570af302Sopenharmony_cipS5 = -2.56165783329023486777386833928147375e-01L, 39570af302Sopenharmony_cipS6 = 4.80718586374448793411019434585413855e-02L, 40570af302Sopenharmony_cipS7 = -4.42523267167024279410230886239774718e-03L, 41570af302Sopenharmony_cipS8 = 1.44551535183911458253205638280410064e-04L, 42570af302Sopenharmony_cipS9 = -2.10558957916600254061591040482706179e-07L, 43570af302Sopenharmony_ciqS1 = -4.84690167848739751544716485245697428e+00L, 44570af302Sopenharmony_ciqS2 = 9.96619113536172610135016921140206980e+00L, 45570af302Sopenharmony_ciqS3 = -1.13177895428973036660836798461641458e+01L, 46570af302Sopenharmony_ciqS4 = 7.74004374389488266169304117714658761e+00L, 47570af302Sopenharmony_ciqS5 = -3.25871986053534084709023539900339905e+00L, 48570af302Sopenharmony_ciqS6 = 8.27830318881232209752469022352928864e-01L, 49570af302Sopenharmony_ciqS7 = -1.18768052702942805423330715206348004e-01L, 50570af302Sopenharmony_ciqS8 = 8.32600764660522313269101537926539470e-03L, 51570af302Sopenharmony_ciqS9 = -1.99407384882605586705979504567947007e-04L; 52570af302Sopenharmony_ci 53570af302Sopenharmony_ciconst long double pio2_hi = 1.57079632679489661923132169163975140L; 54570af302Sopenharmony_ciconst long double pio2_lo = 4.33590506506189051239852201302167613e-35L; 55570af302Sopenharmony_ci 56570af302Sopenharmony_cilong double __invtrigl_R(long double z) 57570af302Sopenharmony_ci{ 58570af302Sopenharmony_ci long double p, q; 59570af302Sopenharmony_ci p = z*(pS0+z*(pS1+z*(pS2+z*(pS3+z*(pS4+z*(pS5+z*(pS6+z*(pS7+z*(pS8+z*pS9))))))))); 60570af302Sopenharmony_ci q = 1.0+z*(qS1+z*(qS2+z*(qS3+z*(qS4+z*(qS5+z*(qS6+z*(qS7+z*(qS8+z*qS9)))))))); 61570af302Sopenharmony_ci return p/q; 62570af302Sopenharmony_ci} 63570af302Sopenharmony_ci#endif 64