reactos/lib/sdk/crt/math/amd64/ceilf.S

   1 /*
   2  * COPYRIGHT:         See COPYING in the top level directory
   3  * PROJECT:           ReactOS system libraries
   4  * PURPOSE:           Implementation of tan
   5  * FILE:              lib/sdk/crt/math/amd64/ceilf.S
   6  * PROGRAMMER:        Timo Kreuzer (timo.kreuzer@reactos.org)
   7  */
   8
   9 /* INCLUDES ******************************************************************/
  10
  11 #include <asm.inc>
  12 #include <ksamd64.inc>
  13
  14 /* CODE **********************************************************************/
  15 .code64
  16
  17 PUBLIC ceilf
  18 ceilf:
  19     sub rsp, 16
  20
  21     /* Put parameter on the stack */
  22     movss [rsp], xmm0
  23     fld dword ptr [rsp]
  24
  25     /* Change fpu control word to round up */
  26     fstcw [rsp + 8]
  27     mov eax, [rsp + 8]
  28     or  eax, HEX(00800)
  29     and eax, HEX(0fbff)
  30     mov [rsp + 12], eax
  31     fldcw [rsp + 12]
  32
  33     /* Round to integer */
  34     frndint
  35
  36     /* Restore fpu control word */
  37     fldcw [rsp + 8]
  38
  39     fstp dword ptr [rsp]
  40     movss xmm0, [rsp]
  41
  42     add rsp, 16
  43     ret
  44
  45 END