sysdeps/ieee754/flt-32/s_ceilf.c

   1 /* s_ceilf.c -- float version of s_ceil.c.
   2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
   3  */
   4
   5 /*
   6  * ====================================================
   7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10  * Permission to use, copy, modify, and distribute this
  11  * software is freely granted, provided that this notice
  12  * is preserved.
  13  * ====================================================
  14  */
  15
  16 #define NO_MATH_REDIRECT
  17 #include <math.h>
  18 #include <math_private.h>
  19 #include <libm-alias-float.h>
  20
  21
  22 float
  23 __ceilf(float x)
  24 {
  25         int32_t i0,j0;
  26         uint32_t i;
  27
  28         GET_FLOAT_WORD(i0,x);
  29         j0 = ((i0>>23)&0xff)-0x7f;
  30         if(j0<23) {
  31             if(j0<0) {
  32                 /* return 0*sign(x) if |x|<1 */
  33                 if(i0<0) {i0=0x80000000;}
  34                 else if(i0!=0) { i0=0x3f800000;}
  35             } else {
  36                 i = (0x007fffff)>>j0;
  37                 if((i0&i)==0) return x; /* x is integral */
  38                 if(i0>0) i0 += (0x00800000)>>j0;
  39                 i0 &= (~i);
  40             }
  41         } else {
  42             if(__builtin_expect(j0==0x80, 0)) return x+x; /* inf or NaN */
  43             else return x;              /* x is integral */
  44         }
  45         SET_FLOAT_WORD(x,i0);
  46         return x;
  47 }
  48 #ifndef __ceilf
  49 libm_alias_float (__ceil, ceil)
  50 #endif