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32 lines
1.1 KiB
C
32 lines
1.1 KiB
C
module std::math::nolibc @if(env::NO_LIBC);
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/* origin: FreeBSD /usr/src/lib/msun/src/k_sinf.c */
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/*
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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* Optimized by Bruce D. Evans.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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// |sin(x)/x - s(x)| < 2**-37.5 (~[-4.89e-12, 4.824e-12]).
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fn float __sindf(double x) @extern("__sindf") @weak @nostrip
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{
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const S1F = -0x15555554cbac77.0p-55; /* -0.166666666416265235595 */
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const S2F = 0x111110896efbb2.0p-59; /* 0.0083333293858894631756 */
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const S3F = -0x1a00f9e2cae774.0p-65; /* -0.000198393348360966317347 */
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const S4F = 0x16cd878c3b46a7.0p-71; /* 0.0000027183114939898219064 */
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double z = x * x;
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double w = z * z;
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double r = S3F + z * S4F;
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double s = z * x;
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return (float)((x + s * (S1F + z * S2F)) + s * w * r);
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}
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