| 1 | /* sf_sin.c -- float version of s_sin.c. |
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| 2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
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| 3 | */ |
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| 4 | |
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| 5 | /* |
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| 6 | * ==================================================== |
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| 7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 8 | * |
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| 9 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 10 | * Permission to use, copy, modify, and distribute this |
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| 11 | * software is freely granted, provided that this notice |
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| 12 | * is preserved. |
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| 13 | * ==================================================== |
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| 14 | */ |
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| 15 | |
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| 16 | #include "fdlibm.h" |
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| 17 | |
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| 18 | #ifdef __STDC__ |
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| 19 | float sinf(float x) |
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| 20 | #else |
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| 21 | float sinf(x) |
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| 22 | float x; |
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| 23 | #endif |
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| 24 | { |
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| 25 | float y[2],z=0.0; |
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| 26 | __int32_t n,ix; |
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| 27 | |
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| 28 | GET_FLOAT_WORD(ix,x); |
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| 29 | |
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| 30 | /* |x| ~< pi/4 */ |
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| 31 | ix &= 0x7fffffff; |
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| 32 | if(ix <= 0x3f490fd8) return __kernel_sinf(x,z,0); |
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| 33 | |
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| 34 | /* sin(Inf or NaN) is NaN */ |
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| 35 | else if (!FLT_UWORD_IS_FINITE(ix)) return x-x; |
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| 36 | |
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| 37 | /* argument reduction needed */ |
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| 38 | else { |
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| 39 | n = __ieee754_rem_pio2f(x,y); |
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| 40 | switch(n&3) { |
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| 41 | case 0: return __kernel_sinf(y[0],y[1],1); |
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| 42 | case 1: return __kernel_cosf(y[0],y[1]); |
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| 43 | case 2: return -__kernel_sinf(y[0],y[1],1); |
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| 44 | default: |
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| 45 | return -__kernel_cosf(y[0],y[1]); |
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| 46 | } |
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| 47 | } |
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| 48 | } |
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| 49 | |
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| 50 | #ifdef _DOUBLE_IS_32BITS |
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| 51 | |
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| 52 | #ifdef __STDC__ |
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| 53 | double sin(double x) |
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| 54 | #else |
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| 55 | double sin(x) |
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| 56 | double x; |
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| 57 | #endif |
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| 58 | { |
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| 59 | return (double) sinf((float) x); |
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| 60 | } |
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| 61 | |
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| 62 | #endif /* defined(_DOUBLE_IS_32BITS) */ |
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