| e1f414b6 |
1 | #------------------------------------------------------------------------------\r |
| 2 | #\r |
| 3 | # Copyright (c) 2006, Intel Corporation\r |
| 4 | # All rights reserved. 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 | # DivU64x64Remainder.asm\r |
| 15 | #\r |
| 16 | # Abstract:\r |
| 17 | #\r |
| 18 | # Calculate the quotient of a 64-bit integer by a 64-bit integer and returns\r |
| 19 | # both the quotient and the remainder\r |
| 20 | #\r |
| 21 | #------------------------------------------------------------------------------\r |
| 22 | \r |
| 23 | .globl ASM_PFX(InternalMathDivRemU64x32), ASM_PFX(InternalMathDivRemU64x64)\r |
| 24 | \r |
| 25 | #------------------------------------------------------------------------------\r |
| 26 | # UINT64\r |
| 27 | # EFIAPI\r |
| 28 | # InternalMathDivRemU64x64 (\r |
| 29 | # IN UINT64 Dividend,\r |
| 30 | # IN UINT64 Divisor,\r |
| 31 | # OUT UINT64 *Remainder OPTIONAL\r |
| 32 | # );\r |
| 33 | #------------------------------------------------------------------------------\r |
| 34 | ASM_PFX(InternalMathDivRemU64x64):\r |
| 35 | movl 16(%esp), %ecx\r |
| 36 | testl %ecx, %ecx\r |
| 37 | jnz Hard\r |
| 38 | movl 20(%esp), %ecx\r |
| 39 | jecxz L1\r |
| 40 | and $0, 4(%ecx)\r |
| 41 | movl %ecx, 16(%esp)\r |
| 42 | L1:\r |
| 43 | jmp ASM_PFX(InternalMathDivRemU64x32)\r |
| 44 | Hard:\r |
| 45 | push %ebx\r |
| 46 | push %esi\r |
| 47 | push %edi\r |
| 48 | mov 20(%esp), %edx\r |
| 49 | mov 16(%esp), %eax\r |
| 50 | movl %edx, %edi\r |
| 51 | movl %eax, %esi\r |
| 52 | mov 24(%esp), %ebx\r |
| 53 | L2:\r |
| 54 | shrl %edx\r |
| 55 | rcrl $1, %eax\r |
| 56 | shrdl $1, %ecx, %ebx\r |
| 57 | shrl %ecx\r |
| 58 | jnz L2\r |
| 59 | divl %ebx\r |
| 60 | movl %eax, %ebx\r |
| 61 | movl 28(%esp), %ecx\r |
| 62 | mull 24(%esp)\r |
| 63 | imull %ebx, %ecx\r |
| 64 | addl %ecx, %edx\r |
| 65 | mov 32(%esp), %ecx\r |
| 66 | jc TooLarge\r |
| 67 | cmpl %edx, %edi\r |
| 68 | ja Correct\r |
| 69 | jb TooLarge\r |
| 70 | cmpl %eax, %esi\r |
| 71 | jae Correct\r |
| 72 | TooLarge:\r |
| 73 | decl %ebx\r |
| 74 | jecxz Return\r |
| 75 | sub 24(%esp), %eax\r |
| 76 | sbb 28(%esp), %edx\r |
| 77 | Correct:\r |
| 78 | jecxz Return\r |
| 79 | subl %eax, %esi\r |
| 80 | sbbl %edx, %edi\r |
| 81 | movl %esi, (%ecx)\r |
| 82 | movl %edi, 4(%ecx)\r |
| 83 | Return:\r |
| 84 | movl %ebx, %eax\r |
| 85 | xorl %edx, %edx\r |
| 86 | pop %edi\r |
| 87 | pop %esi\r |
| 88 | pop %ebx\r |
| 89 | ret\r |
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