lib/msun/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 #if 0
   9 RCSID("$NetBSD: s_floor.S,v 1.7 2002/03/26 15:17:37 fvdl Exp $")
  10 #endif
  11 RCSID("$DragonFly: src/lib/msun/i387/Attic/s_floor.S,v 1.3 2004/12/29 11:40:18 asmodai Exp $")
  12
  13 ENTRY(floor)
  14 #ifdef __i386__
  15         pushl   %ebp
  16         movl    %esp,%ebp
  17         subl    $8,%esp
  18
  19         fstcw   -4(%ebp)                /* store fpu control word */
  20         movw    -4(%ebp),%dx
  21         orw     $0x0400,%dx             /* round towards -oo */
  22         andw    $0xf7ff,%dx
  23         movw    %dx,-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 #else
  33         movsd   %xmm0, -8(%rsp)
  34         fstcw   -12(%rsp)
  35         movw    -12(%rsp),%dx
  36         orw     $0x0400,%dx
  37         andw    $0xf7ff,%dx
  38         movw    %dx,-16(%rsp)
  39         fldcw   -16(%rsp)
  40         fldl    -8(%rsp)
  41         frndint
  42         fldcw   -12(%rsp)
  43         fstpl   -8(%rsp)
  44         movsd   -8(%rsp),%xmm0
  45 #endif
  46         ret