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Diffstat (limited to '')
| -rw-r--r-- | vendor/compiler_builtins/libm/src/math/k_cosf.rs | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/vendor/compiler_builtins/libm/src/math/k_cosf.rs b/vendor/compiler_builtins/libm/src/math/k_cosf.rs new file mode 100644 index 000000000..e99f2348c --- /dev/null +++ b/vendor/compiler_builtins/libm/src/math/k_cosf.rs @@ -0,0 +1,29 @@ +/* origin: FreeBSD /usr/src/lib/msun/src/k_cosf.c */ +/* + * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. + * Debugged and 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. + * ==================================================== + */ + +/* |cos(x) - c(x)| < 2**-34.1 (~[-5.37e-11, 5.295e-11]). */ +const C0: f64 = -0.499999997251031003120; /* -0x1ffffffd0c5e81.0p-54 */ +const C1: f64 = 0.0416666233237390631894; /* 0x155553e1053a42.0p-57 */ +const C2: f64 = -0.00138867637746099294692; /* -0x16c087e80f1e27.0p-62 */ +const C3: f64 = 0.0000243904487962774090654; /* 0x199342e0ee5069.0p-68 */ + +#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)] +pub(crate) fn k_cosf(x: f64) -> f32 { + let z = x * x; + let w = z * z; + let r = C2 + z * C3; + (((1.0 + z * C0) + w * C1) + (w * z) * r) as f32 +} |