diff options
Diffstat (limited to 'lib/libm/__sindf.c')
| -rw-r--r-- | lib/libm/__sindf.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/lib/libm/__sindf.c b/lib/libm/__sindf.c new file mode 100644 index 00000000..cf16370d --- /dev/null +++ b/lib/libm/__sindf.c @@ -0,0 +1,35 @@ +/* origin: FreeBSD /usr/src/lib/msun/src/k_sinf.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. + * ==================================================== + */ + +#include "libm.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 */ + +float __sindf(double x) +{ + double_t r, s, w, z; + + /* Try to optimize for parallel evaluation as in __tandf.c. */ + z = x * x; + w = z * z; + r = S3 + z * S4; + s = z * x; + return (x + s * (S1 + z * S2)) + s * w * r; +} |