| /* s_rintf.c -- float version of s_rint.c. |
| * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
| */ |
| /* Adapted for use as nearbyint by Ulrich Drepper <drepper@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 <fenv.h> |
| #include "math.h" |
| #include "math_private.h" |
| |
| #ifdef __STDC__ |
| static const float |
| #else |
| static float |
| #endif |
| TWO23[2]={ |
| 8.3886080000e+06, /* 0x4b000000 */ |
| -8.3886080000e+06, /* 0xcb000000 */ |
| }; |
| |
| #ifdef __STDC__ |
| float __nearbyintf(float x) |
| #else |
| float __nearbyintf(x) |
| float x; |
| #endif |
| { |
| fenv_t env; |
| int32_t i0,j0,sx; |
| u_int32_t i,i1; |
| float w,t; |
| GET_FLOAT_WORD(i0,x); |
| sx = (i0>>31)&1; |
| j0 = ((i0>>23)&0xff)-0x7f; |
| if(j0<23) { |
| if(j0<0) { |
| if((i0&0x7fffffff)==0) return x; |
| i1 = (i0&0x07fffff); |
| i0 &= 0xfff00000; |
| i0 |= ((i1|-i1)>>9)&0x400000; |
| SET_FLOAT_WORD(x,i0); |
| feholdexcept (&env); |
| w = TWO23[sx]+x; |
| t = w-TWO23[sx]; |
| fesetenv (&env); |
| GET_FLOAT_WORD(i0,t); |
| SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31)); |
| return t; |
| } else { |
| i = (0x007fffff)>>j0; |
| if((i0&i)==0) return x; /* x is integral */ |
| i>>=1; |
| if((i0&i)!=0) i0 = (i0&(~i))|((0x100000)>>j0); |
| } |
| } else { |
| if(j0==0x80) return x+x; /* inf or NaN */ |
| else return x; /* x is integral */ |
| } |
| SET_FLOAT_WORD(x,i0); |
| feholdexcept (&env); |
| w = TWO23[sx]+x; |
| t = w-TWO23[sx]; |
| fesetenv (&env); |
| return t; |
| } |
| weak_alias (__nearbyintf, nearbyintf) |
