diff options
Diffstat (limited to 'modules/fdlibm/src/k_sinf.cpp')
| -rw-r--r-- | modules/fdlibm/src/k_sinf.cpp | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/modules/fdlibm/src/k_sinf.cpp b/modules/fdlibm/src/k_sinf.cpp new file mode 100644 index 0000000000..c1108625d7 --- /dev/null +++ b/modules/fdlibm/src/k_sinf.cpp @@ -0,0 +1,45 @@ +/* k_sinf.c -- float version of k_sin.c + * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. + * Optimized by Bruce D. Evans. + */ + +/* + * ==================================================== + * 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. + * ==================================================== + */ + +#ifndef INLINE_KERNEL_SINDF +//#include <sys/cdefs.h> +//__FBSDID("$FreeBSD$"); +#endif + +#include "math_private.h" + +/* |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 */ + +#ifdef INLINE_KERNEL_SINDF +static __inline +#endif +float +__kernel_sindf(double x) +{ + double r, s, w, z; + + /* Try to optimize for parallel evaluation as in k_tanf.c. */ + z = x*x; + w = z*z; + r = S3+z*S4; + s = z*x; + return (x + s*(S1+z*S2)) + s*w*r; +} |