mirror of
https://github.com/fluencelabs/musl
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52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
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/* origin: FreeBSD /usr/src/lib/msun/src/s_modff.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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*/
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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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#include "libm.h"
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static const float one = 1.0;
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float modff(float x, float *iptr)
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{
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int32_t i0,j0;
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uint32_t i;
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GET_FLOAT_WORD(i0, x);
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j0 = ((i0>>23) & 0xff) - 0x7f; /* exponent of x */
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if (j0 < 23) { /* integer part in x */
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if (j0 < 0) { /* |x| < 1 */
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SET_FLOAT_WORD(*iptr, i0 & 0x80000000); /* *iptr = +-0 */
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return x;
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}
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i = 0x007fffff >> j0;
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if ((i0&i) == 0) { /* x is integral */
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uint32_t ix;
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*iptr = x;
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GET_FLOAT_WORD(ix, x);
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SET_FLOAT_WORD(x, ix & 0x80000000); /* return +-0 */
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return x;
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}
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SET_FLOAT_WORD(*iptr, i0&~i);
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return x - *iptr;
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} else { /* no fraction part */
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uint32_t ix;
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*iptr = x*one;
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if (x != x) /* NaN */
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return x;
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GET_FLOAT_WORD(ix, x);
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SET_FLOAT_WORD(x, ix & 0x80000000); /* return +-0 */
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return x;
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}
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}
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