1 #------------------------------------------------------------------------------ 2 # 3 # Copyright (c) 2014, 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 # MathRShiftU64.S 15 # 16 # Abstract: 17 # 18 # 64-bit Math Worker Function. 19 # Shifts a 64-bit unsigned value right by a certain number of bits. 20 # 21 #------------------------------------------------------------------------------ 22 23 24 .686: 25 .code: 26 27 ASM_GLOBAL ASM_PFX(__ashrdi3) 28 29 #------------------------------------------------------------------------------ 30 # 31 # void __cdecl __ashrdi3 (void) 32 # 33 #------------------------------------------------------------------------------ 34 ASM_PFX(__ashrdi3): 35 # 36 # Checking: Only handle 64bit shifting or more 37 # 38 cmpb $64, %cl 39 jae _Exit 40 41 # 42 # Handle shifting between 0 and 31 bits 43 # 44 cmpb $32, %cl 45 jae More32 46 shrd %cl, %edx, %eax 47 shr %cl, %edx 48 ret 49 50 # 51 # Handle shifting of 32-63 bits 52 # 53 More32: 54 movl %edx, %eax 55 xor %edx, %edx 56 and $31, %cl 57 shr %cl, %eax 58 ret 59 60 # 61 # Invalid number (less then 32bits), return 0 62 # 63 _Exit: 64 xor %eax, %eax 65 xor %edx, %edx 66 ret 67
