lib/msun/i387/s_trunc.S

   1 /*
   2  * Based on code written by J.T. Conklin <jtc@NetBSD.org>.
   3  * Public domain.
   4  */
   5
   6 #include <machine/asm.h>
   7 ENTRY(trunc)
   8         pushl   %ebp
   9         movl    %esp,%ebp
  10         subl    $8,%esp
  11
  12         fstcw   -4(%ebp)                /* store fpu control word */
  13         movw    -4(%ebp),%dx
  14         orw     $0x0c00,%dx             /* round towards -oo */
  15         movw    %dx,-8(%ebp)
  16         fldcw   -8(%ebp)                /* load modified control word */
  17
  18         fldl    8(%ebp)                 /* round */
  19         frndint
  20
  21         fldcw   -4(%ebp)                /* restore original control word */
  22
  23         leave
  24         ret
  25 END(trunc)
  26
  27         .section .note.GNU-stack,"",%progbits