lib/libm/arch/i386/s_floorf.S

   1 /*
   2  * Written by J.T. Conklin <jtc@NetBSD.org>.
   3  * Public domain.
   4  *
   5  * $NetBSD: s_floorf.S,v 1.7 2004/07/16 18:40:24 drochner Exp $
   6  * $DragonFly: src/lib/libm/arch/i386/s_floorf.S,v 1.1 2005/07/26 21:15:19 joerg Exp $
   7  */
   8
   9 #include <machine/asm.h>
  10
  11 ENTRY(floorf)
  12 #ifdef __i386__
  13         pushl   %ebp
  14         movl    %esp,%ebp
  15         subl    $8,%esp
  16
  17         fstcw   -4(%ebp)                /* store fpu control word */
  18         movw    -4(%ebp),%dx
  19         orw     $0x0400,%dx             /* round towards -oo */
  20         andw    $0xf7ff,%dx
  21         movw    %dx,-8(%ebp)
  22         fldcw   -8(%ebp)                /* load modfied control word */
  23
  24         flds    8(%ebp);                /* round */
  25         frndint
  26
  27         fldcw   -4(%ebp)                /* restore original control word */
  28
  29         leave
  30 #else
  31         movss   %xmm0, -4(%rsp)
  32         fstcw   -8(%rsp)
  33         movw    -8(%rsp),%dx
  34         orw     $0x0400,%dx
  35         andw    $0xf7ff,%dx
  36         movw    %dx,-12(%rsp)
  37         fldcw   -12(%rsp)
  38         flds    -4(%rsp)
  39         frndint
  40         fldcw   -8(%rsp)
  41         fstps   -4(%rsp)
  42         movss   -4(%rsp),%xmm0
  43 #endif
  44         ret