projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 97f98500 HT |
1 | #------------------------------------------------------------------------------\r |
| 2 | #\r | |
| 2ac68e8b | 3 | # Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>\r |
| 97f98500 HT |
4 | # This program and the accompanying materials\r |
| 5 | # are licensed and made available under the terms and conditions of the BSD License\r | |
| 6 | # which accompanies this distribution. The full text of the license may be found at\r | |
| 7 | # http://opensource.org/licenses/bsd-license.php.\r | |
| 8 | #\r | |
| 9 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 10 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 11 | #\r | |
| 12 | # Module Name:\r | |
| 13 | #\r | |
| 14 | # MathRShiftU64.S\r | |
| 15 | #\r | |
| 16 | # Abstract:\r | |
| 17 | #\r | |
| 18 | # 64-bit Math Worker Function.\r | |
| 19 | # Shifts a 64-bit unsigned value right by a certain number of bits.\r | |
| 20 | #\r | |
| 21 | #------------------------------------------------------------------------------\r | |
| 22 | \r | |
| 23 | \r | |
| 24 | .686:\r | |
| 25 | .code:\r | |
| 26 | \r | |
| 27 | ASM_GLOBAL ASM_PFX(__ashrdi3)\r | |
| 28 | \r | |
| 29 | #------------------------------------------------------------------------------\r | |
| 30 | #\r | |
| 31 | # void __cdecl __ashrdi3 (void)\r | |
| 32 | #\r | |
| 33 | #------------------------------------------------------------------------------\r | |
| 34 | ASM_PFX(__ashrdi3):\r | |
| 35 | #\r | |
| 36 | # Checking: Only handle 64bit shifting or more\r | |
| 37 | #\r | |
| 38 | cmpb $64, %cl\r | |
| 39 | jae _Exit\r | |
| 40 | \r | |
| 41 | #\r | |
| 42 | # Handle shifting between 0 and 31 bits\r | |
| 43 | #\r | |
| 44 | cmpb $32, %cl\r | |
| 45 | jae More32\r | |
| 46 | shrd %cl, %edx, %eax\r | |
| 47 | shr %cl, %edx\r | |
| 48 | ret\r | |
| 49 | \r | |
| 50 | #\r | |
| 51 | # Handle shifting of 32-63 bits\r | |
| 52 | #\r | |
| 53 | More32:\r | |
| 54 | movl %edx, %eax\r | |
| 55 | xor %edx, %edx\r | |
| 38d91622 | 56 | and $31, %cl\r |
| 97f98500 HT |
57 | shr %cl, %eax\r |
| 58 | ret\r | |
| 59 | \r | |
| 60 | #\r | |
| 61 | # Invalid number (less then 32bits), return 0\r | |
| 62 | #\r | |
| 63 | _Exit:\r | |
| 64 | xor %eax, %eax\r | |
| 65 | xor %edx, %edx\r | |
| 66 | ret\r |