mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 01:21:06 +00:00
51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
/* s_rintf.c -- float version of s_rint.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 <math.h>
|
|
#include <math_private.h>
|
|
|
|
static const float
|
|
TWO23[2]={
|
|
8.3886080000e+06, /* 0x4b000000 */
|
|
-8.3886080000e+06, /* 0xcb000000 */
|
|
};
|
|
|
|
float
|
|
__rintf(float x)
|
|
{
|
|
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) {
|
|
w = TWO23[sx]+x;
|
|
t = w-TWO23[sx];
|
|
GET_FLOAT_WORD(i0,t);
|
|
SET_FLOAT_WORD(t,(i0&0x7fffffff)|(sx<<31));
|
|
return t;
|
|
}
|
|
} else {
|
|
if(j0==0x80) return x+x; /* inf or NaN */
|
|
else return x; /* x is integral */
|
|
}
|
|
w = TWO23[sx]+x;
|
|
return w-TWO23[sx];
|
|
}
|
|
#ifndef __rintf
|
|
weak_alias (__rintf, rintf)
|
|
#endif
|