StdLib/LibC/Main/Ia32/fpu_rmode.asm

   1 ;------------------------------------------------------------------------------
   2 ; Return the current FPU rounding mode.
   3 ;
   4 ; MASM implementation of the flt_rounds function by:
   5 ;   J.T. Conklin, Apr 4, 1995
   6 ;   Public domain.
   7 ;
   8 ; Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
   9 ; This program and the accompanying materials
  10 ; are licensed and made available under the terms and conditions of the BSD License
  11 ; which accompanies this distribution.  The full text of the license may be found at
  12 ; http://opensource.org/licenses/bsd-license.php.
  13 ;
  14 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  15 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  16 ;
  17 ; NetBSD: flt_rounds.S,v 1.6 1999/08/23 08:45:09 kleink Exp
  18 ;------------------------------------------------------------------------------
  19
  20     .686
  21     .model  flat,C
  22     .code
  23
  24 ;_map  BYTE  1     ; round to nearest
  25 ;      BYTE  3     ; round to negative infinity
  26 ;      BYTE  2     ; round to positive infinity
  27 ;      BYTE  0     ; round to zero
  28
  29 ;------------------------------------------------------------------------------
  30 ; int
  31 ; EFIAPI
  32 ; fpu_rmode( void );
  33 ;
  34 ;------------------------------------------------------------------------------
  35
  36 internal_FPU_rmode    PROC
  37     sub     esp, 4          ; Create a local variable for fnstcw
  38     fnstcw  [esp]
  39     mov     eax, [esp]
  40     shr     eax, 10
  41     and     eax, 3
  42     add     esp, 4          ; Delete the local variable
  43     ret
  44 internal_FPU_rmode    ENDP
  45
  46     END