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#   LShiftU64.S
15#
16# Abstract:
17#
18#   64-bit left shift function for IA-32
19#
20#------------------------------------------------------------------------------
21
22ASM_GLOBAL ASM_PFX(InternalMathLShiftU64)
23
24#------------------------------------------------------------------------------
25# UINT64
26# EFIAPI
27# InternalMathLShiftU64 (
28#   IN      UINT64                    Operand,
29#   IN      UINTN                     Count
30#   );
31#------------------------------------------------------------------------------
32ASM_PFX(InternalMathLShiftU64):
33    movb    12(%esp), %cl
34    xorl    %eax, %eax
35    movl    4(%esp), %edx
36    testb   $32, %cl                    # Count >= 32?
37    jnz     L0
38    movl    %edx, %eax
39    movl    0x8(%esp), %edx
40L0:
41    shld    %cl, %eax, %edx
42    shl     %cl, %eax
43    ret
44