/***************************************************************************
Copyright (c) 2013, The OpenBLAS Project
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
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1. Redistributions of source code must retain the above copyright
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2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
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its contributors may be used to endorse or promote products
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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*****************************************************************************/

/**************************************************************************************
* 2013/11/24 Saar
* 	 BLASTEST 		: OK
* 	 CTEST			: OK
* 	 TEST			: OK
*
**************************************************************************************/

#define ASSEMBLER
#include "common.h"

#define STACKSIZE 256

#define	OLD_M	r0
#define	OLD_N	r1
#define	OLD_A	r2
#define	OLD_LDA	r3

#define B	[fp, #4 ]

#define M	r0
#define N	r1
#define A	r2

#define	BO	r5

#define	AO1	r6
#define	AO2	r7
#define	LDA	r8

#define I	r3
#define	J	r12

#define A_PRE	256

/**************************************************************************************
* Macro definitions
**************************************************************************************/

.macro COPY2x2

	fldd	d0 , [ AO1, #0  ]
	fldd	d2 , [ AO1, #8  ]

	fldd	d1 , [ AO2, #0  ]
	fldd	d3 , [ AO2, #8  ]

	add	AO1, AO1, #16
	fstmiad	BO!, { d0 - d3 }
	add	AO2, AO2, #16

.endm


.macro COPY1x2

	fldd	d0 , [ AO1, #0  ]
	fldd	d1 , [ AO2, #0  ]
	add	AO1, AO1, #8

	fstmiad	BO!, { d0 - d1 }
	add	AO2, AO2, #8

.endm

.macro COPY2x1

	fldd	d0 , [ AO1, #0  ]
	fldd	d1 , [ AO1, #8  ]

	fstmiad	BO!, { d0 - d1 }
	add	AO1, AO1, #16

.endm


.macro COPY1x1

	fldd	d0 , [ AO1, #0  ]

	fstmiad	BO!, { d0 }
	add	AO1, AO1, #8

.endm





/**************************************************************************************
* End of macro definitions
**************************************************************************************/

	PROLOGUE

	.align 5

	push	{r4 - r9, fp}
	add	fp, sp, #24

	lsl	LDA, OLD_LDA, #3					// lda = lda * 8

	ldr	BO, B


/*********************************************************************************************/

dgemm_ncopy_L2_BEGIN:

	asrs	J, N, #1					// J = N / 2
	ble	dgemm_ncopy_L1_BEGIN

dgemm_ncopy_L2_M2_BEGIN:

	mov	AO1, A						// AO1 = A
	add	AO2, AO1, LDA
	add	A  , AO2, LDA 					// A = A + 2 * LDA

	asrs	I, M, #1					// I = M / 2
	ble	dgemm_ncopy_L2_M2_40

dgemm_ncopy_L2_M2_20:

	COPY2x2

	subs	I , I , #1
	bne	dgemm_ncopy_L2_M2_20


dgemm_ncopy_L2_M2_40:

	ands	I, M , #1
	ble	dgemm_ncopy_L2_M2_END

dgemm_ncopy_L2_M2_60:

	COPY1x2

	subs	I , I , #1
	bne	dgemm_ncopy_L2_M2_60


dgemm_ncopy_L2_M2_END:

	subs	J , J, #1						// j--
	bne	dgemm_ncopy_L2_M2_BEGIN

/*********************************************************************************************/

dgemm_ncopy_L1_BEGIN:

	tst	N, #1
	ble	dgemm_ncopy_L999


dgemm_ncopy_L1_M2_BEGIN:

	mov	AO1, A						// AO1 = A
	add	A  , AO1, LDA 					// A = A + 1 * LDA

	asrs	I, M, #1					// I = M / 2
	ble	dgemm_ncopy_L1_M2_40

dgemm_ncopy_L1_M2_20:

	COPY2x1

	subs	I , I , #1
	bne	dgemm_ncopy_L1_M2_20


dgemm_ncopy_L1_M2_40:

	ands	I, M , #1
	ble	dgemm_ncopy_L1_M2_END

dgemm_ncopy_L1_M2_60:

	COPY1x1

	subs	I , I , #1
	bne	dgemm_ncopy_L1_M2_60


dgemm_ncopy_L1_M2_END:



dgemm_ncopy_L999:


	movs	r0, #0						// set return value
	sub	sp, fp, #24
	pop	{r4 - r9, fp}
	bx	lr

	EPILOGUE