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| 2 | /* @(#)s_copysign.c 5.1 93/09/24 */
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| 3 | /*
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| 4 | * ====================================================
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| 5 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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| 6 | *
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| 7 | * Developed at SunPro, a Sun Microsystems, Inc. business.
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| 8 | * Permission to use, copy, modify, and distribute this
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| 9 | * software is freely granted, provided that this notice
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| 10 | * is preserved.
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| 11 | * ====================================================
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| 12 | */
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| 13 |
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| 14 | /*
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| 15 | FUNCTION
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| 16 | <<copysign>>, <<copysignf>>---sign of <[y]>, magnitude of <[x]>
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| 17 |
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| 18 | INDEX
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| 19 | copysign
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| 20 | INDEX
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| 21 | copysignf
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| 22 |
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| 23 | ANSI_SYNOPSIS
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| 24 | #include <math.h>
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| 25 | double copysign (double <[x]>, double <[y]>);
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| 26 | float copysignf (float <[x]>, float <[y]>);
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| 27 |
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| 28 | TRAD_SYNOPSIS
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| 29 | #include <math.h>
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| 30 | double copysign (<[x]>, <[y]>)
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| 31 | double <[x]>;
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| 32 | double <[y]>;
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| 33 |
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| 34 | float copysignf (<[x]>, <[y]>)
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| 35 | float <[x]>;
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| 36 | float <[y]>;
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| 37 |
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| 38 | DESCRIPTION
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| 39 | <<copysign>> constructs a number with the magnitude (absolute value)
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| 40 | of its first argument, <[x]>, and the sign of its second argument,
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| 41 | <[y]>.
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| 42 |
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| 43 | <<copysignf>> does the same thing; the two functions differ only in
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| 44 | the type of their arguments and result.
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| 45 |
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| 46 | RETURNS
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| 47 | <<copysign>> returns a <<double>> with the magnitude of
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| 48 | <[x]> and the sign of <[y]>.
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| 49 | <<copysignf>> returns a <<float>> with the magnitude of
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| 50 | <[x]> and the sign of <[y]>.
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| 51 |
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| 52 | PORTABILITY
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| 53 | <<copysign>> is not required by either ANSI C or the System V Interface
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| 54 | Definition (Issue 2).
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| 55 |
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| 56 | */
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| 57 |
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| 58 | /*
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| 59 | * copysign(double x, double y)
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| 60 | * copysign(x,y) returns a value with the magnitude of x and
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| 61 | * with the sign bit of y.
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| 62 | */
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| 63 |
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| 64 | #include "fdlibm.h"
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| 65 |
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| 66 | #ifndef _DOUBLE_IS_32BITS
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| 67 |
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| 68 | #ifdef __STDC__
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| 69 | double copysign(double x, double y)
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| 70 | #else
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| 71 | double copysign(x,y)
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| 72 | double x,y;
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| 73 | #endif
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| 74 | {
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| 75 | uint32_t hx,hy;
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| 76 | GET_HIGH_WORD(hx,x);
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| 77 | GET_HIGH_WORD(hy,y);
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| 78 | SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
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| 79 | return x;
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| 80 | }
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| 81 |
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| 82 | #endif /* _DOUBLE_IS_32BITS */
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