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.S
15#
16# Abstract:
17#
18#   64-bit right rotation for Ia32
19#
20#------------------------------------------------------------------------------
21
22ASM_GLOBAL ASM_PFX(InternalMathRRotU64)
23
24#------------------------------------------------------------------------------
25# UINT64
26# EFIAPI
27# InternalMathRRotU64 (
28#   IN      UINT64                    Operand,
29#   IN      UINTN                     Count
30#   );
31#------------------------------------------------------------------------------
32ASM_PFX(InternalMathRRotU64):
33    push    %ebx
34    movb    16(%esp), %cl
35    movl    8(%esp), %eax
36    movl    12(%esp), %edx
37    shrdl   %cl, %eax, %ebx
38    shrdl   %cl, %edx, %eax
39    roll    %cl, %ebx
40    shrdl   %cl, %ebx, %edx
41    testb   $32, %cl                    # Count >= 32?
42    jz      L0
43    movl    %eax, %ecx                  # switch eax & edx if Count >= 32
44    movl    %edx, %eax
45    movl    %ecx, %edx
46L0:
47    pop     %ebx
48    ret
49