/*

* Copyright (c) 2003 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Graphics Extension Library source file

 *

*/

@ 

@   GfxMultiplyAsm - Multiply a 16:16 fixed point factor into iValue.

@

@       This function multiplies a 16:16 fixed point factor into iValue using

@   an ARM 64 bit multiply instruction.  This is much faster than using the

@   Symbian TInt64 class.  Note that iValue MUST be the first data member of

@   this class.

@

@       r0 = Pointer to iValue (First data item in TFixPt class).

@       r1 = Second factor to multiply.

        .align  2

        .globl  GfxMultiplyAsm__6TFixPti

        .thumb_func

        .code   16

GfxMultiplyAsm__6TFixPti:

        add     r2, pc, #4            @ Switch from Thumb to ARM execution.

        bx      r2

        nop

        .align  2

        .code   32

        ldr     r2, [r0]              @ r2 = *this, r1 = aVal.iValue.

        smull   r3, r2, r1, r2        @ r2:r3 = iValue * aVal.iValue.

        mov     r2, r2, lsl #16

        orr     r2, r2, r3, lsr #16   @ Extract middle 32 bits from 64 bit product.

        str     r2, [r0]              @ Store into iValue.

        bx      lr