author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 07 Jan 2010 13:38:45 +0200 | |
changeset 10 | 36bfc973b146 |
parent 9 | 96e5fb8b040d |
permissions | -rw-r--r-- |
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// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// e32\euser\epoc\win32\uc_i64.cpp |
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// |
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// |
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#include "u32std.h" |
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#include <e32math.h> |
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#pragma warning ( disable : 4100 ) // unreferenced formal parameter |
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#pragma warning ( disable : 4414 ) // short jump to function converted to near |
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extern "C" void UDiv64(); |
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EXPORT_C __NAKED__ void Math::Mul64(Int64 /*aX*/, Int64 /*aY*/, Int64& /*aOutH*/, Uint64& /*aOutL*/) |
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/** |
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Multiply aX by aY to generate a 128 bit result. |
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The high order 64 bits of this calculation are stored in aOutH, |
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and the low order 64 bits are stored in aOutL. |
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@param aX The first 64-bit operand. |
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@param aY The second 64-bit operand. |
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@param aOutH The high order 64 bits of the result. |
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@param aOutL The low order 64 bits of the result. |
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*/ |
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{ |
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_asm mov eax, [esp+4] |
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_asm mul dword ptr [esp+12] // edx:eax = x0*y0 |
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_asm push edi |
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_asm push esi |
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_asm push ebx // [esp+16]=&aX, [esp+24]=&aY, [esp+32]=&aOutH, [esp+36]=&aOutL |
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_asm mov ecx, eax |
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_asm mov ebx, edx // ebx:ecx = x0*y0 |
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_asm mov eax, [esp+16] |
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_asm mul dword ptr [esp+28] // edx:eax = x0*y1 |
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_asm xor esi, esi |
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_asm add ebx, eax |
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_asm adc esi, edx // esi:ebx:ecx = x0*y |
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_asm mov eax, [esp+20] // eax=x1 |
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_asm imul dword ptr [esp+28] // edx:eax = x1*y1 |
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_asm mov edi, edx |
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_asm add esi, eax |
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_asm adc edi, 0 // partial result in edi:esi:ebx:ecx |
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_asm cmp dword ptr [esp+28], 0 // y<0 ? |
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_asm jns mul64_ypos |
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_asm sub esi, [esp+16] // if so, subtract x0<<64 |
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_asm sbb edi, 0 |
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mul64_ypos: |
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_asm mov eax, [esp+20] // eax=x1 |
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_asm cmp eax, 0 // x<0 ? |
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_asm jns mul64_xpos |
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_asm sub esi, [esp+24] // if so, subtract y0<<64 |
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_asm sbb edi, 0 |
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mul64_xpos: |
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_asm mul dword ptr [esp+24] // edx:eax = x1*y0 |
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_asm add ebx, eax |
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_asm mov eax, [esp+32] // eax=&aOutH |
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_asm adc esi, edx |
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_asm mov edx, [esp+36] // edx=&aOutL |
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_asm adc edi, 0 // full result now in edi:esi:ebx:ecx |
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_asm mov [eax], esi |
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_asm mov [eax+4], edi // store high 64 |
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_asm mov [edx], ecx |
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_asm mov [edx+4], ebx // store low 64 |
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_asm pop ebx |
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_asm pop esi |
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_asm pop edi |
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_asm ret |
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} |
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|
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EXPORT_C __NAKED__ void Math::UMul64(Uint64 /*aX*/, Uint64 /*aY*/, Uint64& /*aOutH*/, Uint64& /*aOutL*/) |
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/** |
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Multiply aX by aY to generate a 128 bit result. |
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|
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The high order 64 bits of this calculation are stored in aOutH, |
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and the low order 64 bits are stored in aOutL. |
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|
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@param aX The first 64-bit operand. |
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@param aY The second 64-bit operand. |
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@param aOutH The high order 64 bits of the result. |
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@param aOutL The low order 64 bits of the result. |
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*/ |
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101 |
{ |
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_asm mov eax, [esp+4] |
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_asm mul dword ptr [esp+12] // edx:eax = x0*y0 |
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_asm push edi |
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_asm push esi |
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_asm push ebx // [esp+16]=&aX, [esp+24]=&aY, [esp+32]=&aOutH, [esp+36]=&aOutL |
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_asm mov ecx, eax |
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_asm mov ebx, edx // ebx:ecx = x0*y0 |
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_asm mov eax, [esp+16] |
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_asm mul dword ptr [esp+28] // edx:eax = x0*y1 |
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_asm xor esi, esi |
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_asm add ebx, eax |
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_asm adc esi, edx // esi:ebx:ecx = x0*y |
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_asm mov eax, [esp+20] // eax=x1 |
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_asm mul dword ptr [esp+28] // edx:eax = x1*y1 |
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_asm mov edi, edx |
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_asm add esi, eax |
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_asm adc edi, 0 // partial result in edi:esi:ebx:ecx |
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_asm mov eax, [esp+20] |
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_asm mul dword ptr [esp+24] // edx:eax = x1*y0 |
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_asm add ebx, eax |
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_asm mov eax, [esp+32] // eax=&aOutH |
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_asm adc esi, edx |
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_asm mov edx, [esp+36] // edx=&aOutL |
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_asm adc edi, 0 // full result now in edi:esi:ebx:ecx |
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_asm mov [eax], esi |
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_asm mov [eax+4], edi // store high 64 |
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_asm mov [edx], ecx |
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_asm mov [edx+4], ebx // store low 64 |
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_asm pop ebx |
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_asm pop esi |
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_asm pop edi |
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_asm ret |
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} |
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|
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|
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|
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|
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EXPORT_C __NAKED__ Int64 Math::DivMod64(Int64 /*aDividend*/, Int64 /*aDivisor*/, Int64& /*aRemainder*/) |
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/** |
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Divides aDividend by aDivisor. |
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|
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The quotient is returned, and the remainder is stored in aRemainder. |
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The remainder has same sign as the dividend. |
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|
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@param aDividend The 64-bit dividend. |
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@param aDivisor The 64-bit divisor. |
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@param aRemainder The 64-bit remainder. |
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|
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@return The 64-bit quotient. |
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*/ |
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{ |
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_asm mov eax, [esp+4] |
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_asm mov edx, [esp+8] // edx:eax = dividend |
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_asm cmp edx, 0 |
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_asm jns divmod64_0 |
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_asm neg edx |
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_asm neg eax |
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_asm sbb edx, 0 |
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divmod64_0: // edx:eax = ABS(dividend) |
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_asm push edi |
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_asm push esi |
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_asm push ebx |
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_asm push ebp |
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_asm mov esi, [esp+28] |
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_asm mov edi, [esp+32] // edi:esi = dividend |
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_asm cmp edi, 0 |
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_asm jns divmod64_1 |
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_asm neg edi |
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_asm neg esi |
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_asm sbb edi, 0 // edi:esi = ABS(dividend) |
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divmod64_1: |
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_asm call UDiv64 // do division, quotient in ebx:eax remainder in edi:edx |
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_asm xchg ebx, edx // quotient in edx:eax, remainder in edi:ebx |
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_asm mov ecx, [esp+24] // ecx=dividend high |
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_asm xor ecx, [esp+32] // ecx=dividend high ^ divisor high |
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_asm jns divmod64_2 |
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_asm neg edx |
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_asm neg eax |
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_asm sbb edx, 0 |
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divmod64_2: // edx:eax = quotient with correct sign |
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_asm cmp dword ptr [esp+24], 0 |
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_asm jns divmod64_3 |
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_asm neg edi |
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_asm neg ebx |
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_asm sbb edi, 0 |
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divmod64_3: // edi:ebx = remainder with correct sign |
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_asm mov ecx, [esp+36] // ecx=&aRemainder |
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_asm mov [ecx], ebx |
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_asm mov [ecx+4], edi |
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_asm pop ebp |
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_asm pop ebx |
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_asm pop esi |
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_asm pop edi |
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_asm ret |
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} |
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197 |
|
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|
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199 |
|
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200 |
|
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EXPORT_C __NAKED__ Uint64 Math::UDivMod64(Uint64 /*aDividend*/, Uint64 /*aDivisor*/, Uint64& /*aRemainder*/) |
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/** |
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Divides aDividend by aDivisor. |
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The quotient is returned, and the remainder is stored in aRemainder. |
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@param aDividend The 64-bit dividend. |
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@param aDivisor The 64-bit divisor. |
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@param aRemainder The 64-bit remainder. |
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@return The 64-bit quotient. |
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*/ |
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{ |
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_asm mov eax, [esp+4] |
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_asm mov edx, [esp+8] // edx:eax = dividend |
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_asm push edi |
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_asm push esi |
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_asm push ebx |
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_asm push ebp |
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_asm mov esi, [esp+28] |
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_asm mov edi, [esp+32] // edi:esi = dividend |
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_asm call UDiv64 // do division, quotient in ebx:eax remainder in edi:edx |
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_asm xchg ebx, edx // quotient in edx:eax, remainder in edi:ebx |
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_asm mov ecx, [esp+36] // ecx=&aRemainder |
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_asm mov [ecx], ebx |
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_asm mov [ecx+4], edi |
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_asm pop ebp |
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_asm pop ebx |
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_asm pop esi |
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_asm pop edi |
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_asm ret |
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} |
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#pragma warning ( default : 4100 ) |
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#pragma warning ( default : 4414 ) |