sysdeps/libm-i387/s_floor.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_floor.S,v 1.4 1995/05/09 00:01:59 jtc Exp $")
   9
  10 ENTRY(__floor)
  11         pushl   %ebp
  12         movl    %esp,%ebp
  13         subl    $8,%esp
  14
  15         fstcw   -4(%ebp)                /* store fpu control word */
  16         movw    -4(%ebp),%dx
  17         orw     $0x0400,%dx             /* round towards -oo */
  18         andw    $0xf7ff,%dx
  19         movw    %dx,-8(%ebp)
  20         fldcw   -8(%ebp)                /* load modified control word */
  21
  22         fldl    8(%ebp);                /* round */
  23         frndint
  24
  25         fldcw   -4(%ebp)                /* restore original control word */
  26
  27         leave
  28         ret
  29 END (__floor)
  30 weak_alias (__floor, floor)