55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
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/* s_modff.c -- float version of s_modf.c.
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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 <math.h>
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#include <math_private.h>
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#include <libm-alias-float.h>
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static const float one = 1.0;
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float
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__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(__builtin_expect(j0<23, 1)) { /* 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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} else {
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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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} else {
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SET_FLOAT_WORD(*iptr,i0&(~i));
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return x - *iptr;
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}
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}
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} else { /* no fraction part */
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*iptr = x*one;
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/* We must handle NaNs separately. */
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if (j0 == 0x80 && (i0 & 0x7fffff))
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return x*one;
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SET_FLOAT_WORD(x,i0&0x80000000); /* return +-0 */
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return x;
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}
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}
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libm_alias_float (__modf, modf)
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