sysdeps/libm-i387/s_ceil.S

   1 /*
   2  * Written by J.T. Conklin <jtc@netbsd.org>.
   3  * Public domain.
   4  */
   5
   6 #include <machine/asm.h>
   7
   8 RCSID("$NetBSD: s_ceil.S,v 1.4 1995/05/08 23:52:13 jtc Exp $")
   9
  10 ENTRY(__ceil)
  11         pushl   %ebp
  12         movl    %esp,%ebp
  13         subl    $8,%esp
  14
  15         fstcw   -4(%ebp)                /* store fpu control word */
  16
  17         /* We use here %edx although only the low 1 bits are defined.
  18            But none of the operations should care and they are faster
  19            than the 16 bit operations.  */
  20         movl    -4(%ebp),%edx
  21         orl     $0x0800,%edx            /* round towards +oo */
  22         andl    $0xfbff,%edx
  23         movl    %edx,-8(%ebp)
  24         fldcw   -8(%ebp)                /* load modfied control word */
  25
  26         fldl    8(%ebp);                /* round */
  27         frndint
  28
  29         fldcw   -4(%ebp)                /* restore original control word */
  30
  31         leave
  32         ret
  33 PSEUDO_END (__ceil)
  34 weak_alias (__ceil, ceil)