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101 lines
2.5 KiB
Plaintext
101 lines
2.5 KiB
Plaintext
module std::math::nolibc @if(env::NO_LIBC || $feature(C3_MATH));
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/* origin: FreeBSD /usr/src/lib/msun/src/s_tan.c */
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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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fn double tan(double x) @cname("tan") @weak @nostrip
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{
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uint ix = x.high_word();
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ix &= 0x7fffffff;
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// |x| ~< pi/4
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switch
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{
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case ix <= 0x3fe921fb:
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if (ix < 0x3e400000)
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{
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// |x| < 2**-27
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/* raise inexact if x!=0 and underflow if subnormal */
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force_eval_add(ix < 0x00100000 ? x / 0x1p120f : x + 0x1p120f, 0);
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return x;
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}
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return __tan(x, 0.0, 0);
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// tan(Inf or NaN) is NaN
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case ix >= 0x7ff00000:
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return x - x;
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default:
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// argument reduction
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double[2] y;
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uint n = __rem_pio2(x, &y);
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return __tan(y[0], y[1], n & 1);
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}
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}
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/* origin: FreeBSD /usr/src/lib/msun/src/s_tanf.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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fn float tanf(float x) @cname("tanf") @weak @nostrip
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{
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uint ix = x.word();
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uint sign = ix >> 31;
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ix &= 0x7fffffff;
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switch
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{
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// |x| ~<= pi/4
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case ix <= 0x3f490fda:
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// |x| < 2**-12
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if (ix < 0x39800000)
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{
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/* raise inexact if x!=0 and underflow if subnormal */
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force_eval_add(ix < 0x00800000 ? x / 0x1p120f : x + 0x1p120f, 0);
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return x;
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}
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return __tandf(x, 0);
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// |x| ~<= 5*pi/4
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case ix <= 0x407b53d1:
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// |x| ~<= 3pi/4
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return ix <= 0x4016cbe3
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? __tandf(sign ? x + S1PI2 : x - S1PI2, 1)
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: __tandf(sign ? x + S2PI2 : x - S2PI2, 0);
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// |x| ~<= 9*pi/4
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case ix <= 0x40e231d5:
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// |x| ~<= 7*pi/4
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return ix <= 0x40afeddf
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? __tandf(sign ? x + S3PI2 : x - S3PI2, 1)
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: __tandf(sign ? x + S4PI2 : x - S4PI2, 0);
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// tan(Inf or NaN) is NaN
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case ix >= 0x7f800000:
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return x - x;
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default:
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// argument reduction
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double y;
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uint n = __rem_pio2f(x, &y);
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return __tandf(y, n & 1);
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}
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}
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