| /* 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> |
| |
| static const float |
| TWO23[2]={ |
| 8.3886080000e+06, /* 0x4b000000 */ |
| -8.3886080000e+06, /* 0xcb000000 */ |
| }; |
| |
| float |
| __nearbyintf(float x) |
| { |
| fenv_t env; |
| int32_t i0,j0,sx; |
| float w,t; |
| GET_FLOAT_WORD(i0,x); |
| sx = (i0>>31)&1; |
| j0 = ((i0>>23)&0xff)-0x7f; |
| if(j0<23) { |
| if(j0<0) { |
| libc_feholdexceptf (&env); |
| w = TWO23[sx]+x; |
| t = w-TWO23[sx]; |
| math_force_eval (t); |
| libc_fesetenvf (&env); |
| GET_FLOAT_WORD(i0,t); |
| SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31)); |
| return t; |
| } |
| } else { |
| if(__builtin_expect(j0==0x80, 0)) return x+x; /* inf or NaN */ |
| else return x; /* x is integral */ |
| } |
| libc_feholdexceptf (&env); |
| w = TWO23[sx]+x; |
| t = w-TWO23[sx]; |
| math_force_eval (t); |
| libc_fesetenvf (&env); |
| return t; |
| } |
| weak_alias (__nearbyintf, nearbyintf) |
