| /* s_modff.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 <sys/cdefs.h> |
| __FBSDID("$FreeBSD$"); |
| |
| #include "math.h" |
| #include "math_private.h" |
| |
| static const float one = 1.0; |
| |
| float |
| modff(float x, float *iptr) |
| { |
| int32_t i0,j0; |
| u_int32_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 */ |
| u_int32_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 */ |
| u_int32_t ix; |
| *iptr = x*one; |
| if (x != x) /* NaN */ |
| return x; |
| GET_FLOAT_WORD(ix,x); |
| SET_FLOAT_WORD(x,ix&0x80000000); /* return +-0 */ |
| return x; |
| } |
| } |
