lib/libm/i386/s_floorf.S

   1 /*
   2  * Written by J.T. Conklin <jtc@netbsd.org>.
   3  * Public domain.
   4  *
   5  * $FreeBSD: head/lib/msun/i387/s_floorf.S 217108 2011-01-07 16:13:12Z kib $
   6  * $NetBSD: s_floorf.S,v 1.3 1995/05/09 00:04:32 jtc Exp $
   7  */
   8
   9 #include <machine/asm.h>
  10
  11 ENTRY(floorf)
  12         pushl   %ebp
  13         movl    %esp,%ebp
  14         subl    $8,%esp
  15
  16         fstcw   -4(%ebp)                /* store fpu control word */
  17         movw    -4(%ebp),%dx
  18         orw     $0x0400,%dx             /* round towards -oo */
  19         andw    $0xf7ff,%dx
  20         movw    %dx,-8(%ebp)
  21         fldcw   -8(%ebp)                /* load modfied control word */
  22
  23         flds    8(%ebp)                 /* round */
  24         frndint
  25
  26         fldcw   -4(%ebp)                /* restore original control word */
  27
  28         leave
  29         ret
  30 END(floorf)
  31
  32         .section .note.GNU-stack,"",%progbits