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f1baef62 | 1 | #------------------------------------------------------------------------------ |
2 | # | |
1f86b07d | 3 | # Copyright (c) 2006 - 2008, Intel Corporation |
f1baef62 | 4 | # All rights reserved. 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 | # | |
1f86b07d | 14 | # LShiftU64.S |
f1baef62 | 15 | # |
16 | # Abstract: | |
17 | # | |
18 | # 64-bit left shift function for IA-32 | |
19 | # | |
20 | #------------------------------------------------------------------------------ | |
21 | ||
22 | .globl ASM_PFX(InternalMathLShiftU64) | |
23 | ||
24 | #------------------------------------------------------------------------------ | |
25 | # UINT64 | |
26 | # EFIAPI | |
27 | # InternalMathLShiftU64 ( | |
28 | # IN UINT64 Operand, | |
29 | # IN UINTN Count | |
30 | # ); | |
31 | #------------------------------------------------------------------------------ | |
32 | ASM_PFX(InternalMathLShiftU64): | |
33 | movb 12(%esp), %cl | |
34 | xorl %eax, %eax | |
35 | movl 4(%esp), %edx | |
57246fe0 | 36 | testb $32, %cl # Count >= 32? |
f1baef62 | 37 | cmovz %edx, %eax |
38 | cmovz 0x8(%esp), %edx | |
39 | shld %cl, %eax, %edx | |
40 | shl %cl, %eax | |
41 | ret |