summaryrefslogtreecommitdiff
path: root/Core/MdePkg/Library/BaseLib/Ia32/ARShiftU64.asm
blob: 10f04c3875166780aa56122404d220b4bed7d6b2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution.  The full text of the license may be found at
; http://opensource.org/licenses/bsd-license.php.
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
; Module Name:
;
;   ARShiftU64.asm
;
; Abstract:
;
;   64-bit arithmetic right shift function for IA-32
;
;------------------------------------------------------------------------------

    .686
    .model  flat,C
    .code

;------------------------------------------------------------------------------
; UINT64
; EFIAPI
; InternalMathARShiftU64 (
;   IN      UINT64                    Operand,
;   IN      UINTN                     Count
;   );
;------------------------------------------------------------------------------
InternalMathARShiftU64  PROC
    mov     cl, [esp + 12]
    mov     eax, [esp + 8]
    cdq
    test    cl, 32
    jnz     @F
    mov     edx, eax
    mov     eax, [esp + 4]
@@:    
    shrd    eax, edx, cl
    sar     edx, cl
    ret
InternalMathARShiftU64  ENDP

    END