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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 | # RShiftU64.S |
f1baef62 | 15 | # |
16 | # Abstract: | |
17 | # | |
18 | # 64-bit logical right shift function for IA-32 | |
19 | # | |
20 | #------------------------------------------------------------------------------ | |
21 | ||
22 | .686: | |
23 | .code: | |
24 | ||
25 | .globl ASM_PFX(InternalMathRShiftU64) | |
26 | ||
27 | #------------------------------------------------------------------------------ | |
28 | # UINT64 | |
29 | # EFIAPI | |
30 | # InternalMathRShiftU64 ( | |
31 | # IN UINT64 Operand, | |
32 | # IN UINTN Count | |
33 | # ); | |
34 | #------------------------------------------------------------------------------ | |
35 | ASM_PFX(InternalMathRShiftU64): | |
57246fe0 | 36 | movb 12(%esp), %cl # cl <- Count |
f1baef62 | 37 | xorl %edx, %edx |
38 | movl 8(%esp), %eax | |
57246fe0 | 39 | testb $32, %cl # Count >= 32? |
f1baef62 | 40 | cmovz %eax, %edx |
41 | cmovz 0x4(%esp), %eax | |
42 | shrdl %cl, %edx, %eax | |
43 | shr %cl, %edx | |
44 | ret |