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 ; RShiftU64.nasm 15 ; 16 ; Abstract: 17 ; 18 ; 64-bit logical right shift function for IA-32 19 ; 20 ;------------------------------------------------------------------------------ 21 22 SECTION .text 23 24 ;------------------------------------------------------------------------------ 25 ; UINT64 26 ; EFIAPI 27 ; InternalMathRShiftU64 ( 28 ; IN UINT64 Operand, 29 ; IN UINTN Count 30 ; ); 31 ;------------------------------------------------------------------------------ 32 global ASM_PFX(InternalMathRShiftU64) 33 ASM_PFX(InternalMathRShiftU64): 34 mov cl, [esp + 12] ; cl <- Count 35 xor edx, edx 36 mov eax, [esp + 8] 37 test cl, 32 ; Count >= 32? 38 jnz .0 39 mov edx, eax 40 mov eax, [esp + 4] 41 .0: 42 shrd eax, edx, cl 43 shr edx, cl 44 ret 45 46
