1;------------------------------------------------------------------------------
2;
3; Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
4; This program and the accompanying materials
5; are licensed and made available under the terms and conditions of the BSD License
6; which accompanies this distribution.  The full text of the license may be found at
7; http://opensource.org/licenses/bsd-license.php.
8;
9; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
11;
12; Module Name:
13;
14;   RRotU64.nasm
15;
16; Abstract:
17;
18;   64-bit right rotation for Ia32
19;
20;------------------------------------------------------------------------------
21
22    SECTION .text
23
24;------------------------------------------------------------------------------
25; UINT64
26; EFIAPI
27; InternalMathRRotU64 (
28;   IN      UINT64                    Operand,
29;   IN      UINTN                     Count
30;   );
31;------------------------------------------------------------------------------
32global ASM_PFX(InternalMathRRotU64)
33ASM_PFX(InternalMathRRotU64):
34    push    ebx
35    mov     cl, [esp + 16]
36    mov     eax, [esp + 8]
37    mov     edx, [esp + 12]
38    shrd    ebx, eax, cl
39    shrd    eax, edx, cl
40    rol     ebx, cl
41    shrd    edx, ebx, cl
42    test    cl, 32                      ; Count >= 32?
43    jz      .0
44    mov     ecx, eax                    ; switch eax & edx if Count >= 32
45    mov     eax, edx
46    mov     edx, ecx
47.0:
48    pop     ebx
49    ret
50
51