3 #Copyright (c) 2006, 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
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.
18 # 64-bit right shift function for IA-32
25 #---------------------------------------------------------------------------
30 #---------------------------------------------------------------------------
31 .globl ASM_PFX(RShiftU64)
40 # This routine allows a 64 bit value to be right shifted by 32 bits and returns the
42 # Count is valid up 63. (Only Bits 0-5 is valid for Count)
44 # Operand - Value to be shifted
45 # Count - Number of times to shift right.
49 # Value shifted right identified by the Count.
54 movl 4(%esp), %eax # dword ptr Operand[0]
55 movl 8(%esp), %edx # dword ptr Operand[4]
58 # CL is valid from 0 - 31. shld will move EDX:EAX by CL times but EDX is not touched
59 # For CL of 32 - 63, it will be shifted 0 - 31 so we will move edx to eax later.
61 movl 0xC(%esp), %ecx # Count
70 # Since Count is 32 - 63, edx will have been shifted by 0 - 31
71 # If shifted by 32 or more, set upper 32 bits to zero.