1 /*

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

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

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

     6 * which accompanies this distribution, and is available

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

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:  Graphics Extension Library source file

    15  *

    16 */

    17 

    18 

    19 @

    20 @       ClearAsm - Clear a contiguous block of memory Fast!

    21 @

    22 @   This function writes a contiguous block of memory very fast with a single

    23 @ color.  The size of the block must be a multiple of 16 pixels (32 bytes).

    24 @

    25 @       r0 = Pointer to this class (not used).

    26 @       r1 = Address of memory block to clear.

    27 @       r2 = Color.

    28 @       r3 = Size of block to clear (in 16 pixel increments).

    29 

    30         .align  2

    31         .globl  ClearAsm__8CGfx2dGcPiii

    32 @       .thumb_func

    33 @       .code   16

    34 

    35 ClearAsm__8CGfx2dGcPiii:

    36         stmfd   sp!, {r4-r9}

    37         mov     r0,r1                   @ Save address and size.

    38         mov     r9,r3

    39         orr     r2,r2,r2,lsl #16        @ Replicate color pattern.

    40         mov     r1,r2           

    41         mov     r3,r2          

    42         mov     r4,r2

    43         mov     r5,r2

    44         mov     r6,r2

    45         mov     r7,r2

    46         mov     r8,r2

    47 loop:   stmia   r0!,{r1-r8}

    48         subs    r9,r9,#1

    49         bne     loop

    50 

    51         ldmfd   sp!, {r4-r9}

    52         bx      lr

    53