| /*- |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| * |
| * k_sinf.c and k_cosf.c merged by Steven G. Kargl. |
| */ |
| |
| #include <sys/cdefs.h> |
| __FBSDID("$FreeBSD$"); |
| |
| /* |sin(x)/x - s(x)| < 2**-37.5 (~[-4.89e-12, 4.824e-12]). */ |
| static const double |
| S1 = -0x15555554cbac77.0p-55, /* -0.166666666416265235595 */ |
| S2 = 0x111110896efbb2.0p-59, /* 0.0083333293858894631756 */ |
| S3 = -0x1a00f9e2cae774.0p-65, /* -0.000198393348360966317347 */ |
| S4 = 0x16cd878c3b46a7.0p-71; /* 0.0000027183114939898219064 */ |
| |
| /* |cos(x) - c(x)| < 2**-34.1 (~[-5.37e-11, 5.295e-11]). */ |
| static const double |
| C0 = -0x1ffffffd0c5e81.0p-54, /* -0.499999997251031003120 */ |
| C1 = 0x155553e1053a42.0p-57, /* 0.0416666233237390631894 */ |
| C2 = -0x16c087e80f1e27.0p-62, /* -0.00138867637746099294692 */ |
| C3 = 0x199342e0ee5069.0p-68; /* 0.0000243904487962774090654 */ |
| |
| static inline void |
| __kernel_sincosdf(double x, float *sn, float *cs) |
| { |
| double r, s, w, z; |
| |
| z = x * x; |
| w = z * z; |
| r = S3 + z * S4; |
| s = z * x; |
| *sn = (x + s * (S1 + z * S2)) + s * w * r; |
| r = C2 + z * C3; |
| *cs = ((1 + z * C0) + w * C1) + (w * z) * r; |
| } |
