12116Sjkh/* s_modff.c -- float version of s_modf.c. 22116Sjkh * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. 32116Sjkh */ 42116Sjkh 52116Sjkh/* 62116Sjkh * ==================================================== 72116Sjkh * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 82116Sjkh * 92116Sjkh * Developed at SunPro, a Sun Microsystems, Inc. business. 102116Sjkh * Permission to use, copy, modify, and distribute this 118870Srgrimes * software is freely granted, provided that this notice 122116Sjkh * is preserved. 132116Sjkh * ==================================================== 142116Sjkh */ 152116Sjkh 16176451Sdas#include <sys/cdefs.h> 17176451Sdas__FBSDID("$FreeBSD$"); 182116Sjkh 192116Sjkh#include "math.h" 202116Sjkh#include "math_private.h" 212116Sjkh 222116Sjkhstatic const float one = 1.0; 232116Sjkh 2497413Salfredfloat 2597413Salfredmodff(float x, float *iptr) 262116Sjkh{ 272116Sjkh int32_t i0,j0; 282116Sjkh u_int32_t i; 292116Sjkh GET_FLOAT_WORD(i0,x); 302116Sjkh j0 = ((i0>>23)&0xff)-0x7f; /* exponent of x */ 312116Sjkh if(j0<23) { /* integer part in x */ 322116Sjkh if(j0<0) { /* |x|<1 */ 332116Sjkh SET_FLOAT_WORD(*iptr,i0&0x80000000); /* *iptr = +-0 */ 342116Sjkh return x; 352116Sjkh } else { 362116Sjkh i = (0x007fffff)>>j0; 372116Sjkh if((i0&i)==0) { /* x is integral */ 382116Sjkh u_int32_t ix; 392116Sjkh *iptr = x; 402116Sjkh GET_FLOAT_WORD(ix,x); 412116Sjkh SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ 422116Sjkh return x; 432116Sjkh } else { 442116Sjkh SET_FLOAT_WORD(*iptr,i0&(~i)); 452116Sjkh return x - *iptr; 462116Sjkh } 472116Sjkh } 482116Sjkh } else { /* no fraction part */ 492116Sjkh u_int32_t ix; 502116Sjkh *iptr = x*one; 51165839Sdas if (x != x) /* NaN */ 52165839Sdas return x; 532116Sjkh GET_FLOAT_WORD(ix,x); 542116Sjkh SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ 552116Sjkh return x; 562116Sjkh } 572116Sjkh} 58