forked from KolibriOS/kolibrios
74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/* sf_modf.c -- float version of s_modf.c.
|
|
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
|
|
*/
|
|
|
|
/*
|
|
* ====================================================
|
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
|
*
|
|
* Developed at SunPro, a Sun Microsystems, Inc. business.
|
|
* Permission to use, copy, modify, and distribute this
|
|
* software is freely granted, provided that this notice
|
|
* is preserved.
|
|
* ====================================================
|
|
*/
|
|
|
|
#include "fdlibm.h"
|
|
|
|
#ifdef __STDC__
|
|
static const float one = 1.0;
|
|
#else
|
|
static float one = 1.0;
|
|
#endif
|
|
|
|
#ifdef __STDC__
|
|
float modff(float x, float *iptr)
|
|
#else
|
|
float modff(x, iptr)
|
|
float x,*iptr;
|
|
#endif
|
|
{
|
|
__int32_t i0,j0;
|
|
__uint32_t i;
|
|
GET_FLOAT_WORD(i0,x);
|
|
j0 = ((i0>>23)&0xff)-0x7f; /* exponent of x */
|
|
if(j0<23) { /* integer part in x */
|
|
if(j0<0) { /* |x|<1 */
|
|
SET_FLOAT_WORD(*iptr,i0&0x80000000); /* *iptr = +-0 */
|
|
return x;
|
|
} else {
|
|
i = (0x007fffff)>>j0;
|
|
if((i0&i)==0) { /* x is integral */
|
|
__uint32_t ix;
|
|
*iptr = x;
|
|
GET_FLOAT_WORD(ix,x);
|
|
SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */
|
|
return x;
|
|
} else {
|
|
SET_FLOAT_WORD(*iptr,i0&(~i));
|
|
return x - *iptr;
|
|
}
|
|
}
|
|
} else { /* no fraction part */
|
|
__uint32_t ix;
|
|
*iptr = x*one;
|
|
GET_FLOAT_WORD(ix,x);
|
|
SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */
|
|
return x;
|
|
}
|
|
}
|
|
|
|
#ifdef _DOUBLE_IS_32BITS
|
|
|
|
#ifdef __STDC__
|
|
double modf(double x, double *iptr)
|
|
#else
|
|
double modf(x, iptr)
|
|
double x,*iptr;
|
|
#endif
|
|
{
|
|
return (double) modff((float) x, (float *) iptr);
|
|
}
|
|
|
|
#endif /* defined(_DOUBLE_IS_32BITS) */
|