mirror of https://github.com/acidanthera/audk.git
84 lines
2.2 KiB
NASM
84 lines
2.2 KiB
NASM
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006, Intel Corporation
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; All rights reserved. This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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; Module Name:
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;
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; DivU64x64Remainder.asm
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;
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; Abstract:
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;
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; Calculate the quotient of a 64-bit integer by a 64-bit integer and returns
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; both the quotient and the remainder
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;
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;------------------------------------------------------------------------------
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.386
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.model flat,C
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.code
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EXTERN InternalMathDivRemU64x32:PROC
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InternalMathDivRemU64x64 PROC
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mov ecx, [esp + 16]
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test ecx, ecx
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jnz _@DivRemU64x64
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mov ecx, [esp + 20]
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jecxz @F
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and dword ptr [ecx + 4], 0
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mov [esp + 16], ecx
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@@:
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jmp InternalMathDivRemU64x32
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InternalMathDivRemU64x64 ENDP
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_@DivRemU64x64 PROC USES ebx esi edi
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mov edx, dword ptr [esp + 20]
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mov eax, dword ptr [esp + 16]
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mov edi, edx
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mov esi, eax
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mov ebx, dword ptr [esp + 24]
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@@:
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shr edx, 1
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rcr eax, 1
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shrd ebx, ecx, 1
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shr ecx, 1
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jnz @B
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div ebx
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mov ebx, eax
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mov ecx, [esp + 28]
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mul dword ptr [esp + 24]
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imul ecx, ebx
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add edx, ecx
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mov ecx, dword ptr [esp + 32]
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jc @TooLarge
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cmp edi, edx
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ja @Correct
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jb @TooLarge
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cmp esi, eax
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jae @Correct
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@TooLarge:
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dec ebx
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jecxz @Return
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sub eax, dword ptr [esp + 24]
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sbb edx, dword ptr [esp + 28]
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@Correct:
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jecxz @Return
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sub esi, eax
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sbb edi, edx
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mov [ecx], esi
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mov [ecx + 4], edi
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@Return:
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mov eax, ebx
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xor edx, edx
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ret
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_@DivRemU64x64 ENDP
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END
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