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/**************************************************************************************
* 2013/11/11 Saar
* 	 BLASTEST 		: OK
* 	 CTEST			: OK
* 	 TEST			: OK
*
* 2016/01/23 Saar
*        Bugfix for Refs #750 and #740
**************************************************************************************/

#define ASSEMBLER
#include "common.h"

#define STACKSIZE 256

#define	N	r0
#define	X	r1
#define	INC_X	r2
#define	OLD_Y	r3


/******************************************************
* [fp, #-128] - [fp, #-64] is reserved
* for store and restore of floating point
* registers
*******************************************************/

#define OLD_INC_Y	[fp, #4 ]

#define I	r5
#define Y	r6
#define INC_Y	r7

#define X_PRE	512

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

.macro KERNEL_F4

	pld	[ X, #X_PRE  ]
	fldmiad	X!, { d8 }
	pld	[ Y, #X_PRE  ]
	fldmiad	Y!, { d4 }
	fldmiad	Y!, { d5 }
	fmacd   d0  , d4,  d8
	fldmiad	X!, { d9 }
	fldmiad	Y!, { d6 }
	fmacd   d1  , d5,  d9
	fldmiad	X!, { d10 }
	fldmiad	X!, { d11 }
	fmacd   d0  , d6,  d10
	fldmiad	Y!, { d7 }
	fmacd   d1  , d7,  d11

.endm

.macro KERNEL_F1

	fldmiad	X!, { d4 }
	fldmiad	Y!, { d8 }
	fmacd   d0  , d4,  d8

.endm


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

.macro KERNEL_S4

	nop
	fldmiad	X, { d4 }
	fldmiad	Y, { d8 }
	add	X, X, INC_X
	add	Y, Y, INC_Y
	fmacd   d0  , d4,  d8

	fldmiad	X, { d5 }
	fldmiad	Y, { d9 }
	add	X, X, INC_X
	add	Y, Y, INC_Y
	fmacd   d1  , d5,  d9

	fldmiad	X, { d6 }
	fldmiad	Y, { d10 }
	add	X, X, INC_X
	add	Y, Y, INC_Y
	fmacd   d0  , d6,  d10

	fldmiad	X, { d7 }
	fldmiad	Y, { d11 }
	add	X, X, INC_X
	add	Y, Y, INC_Y
	fmacd   d1  , d7,  d11

.endm


.macro KERNEL_S1

	fldmiad	X, { d4 }
	fldmiad	Y, { d8 }
	add	X, X, INC_X
	fmacd   d0  , d4,  d8
	add	Y, Y, INC_Y

.endm



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

	PROLOGUE

	.align 5

	push	{r4 - r9, fp}
	add	fp, sp, #24
	sub	sp, sp, #STACKSIZE				// reserve stack

	sub	r4, fp, #128
	vstm	r4, { d8 - d15} 				// store floating point registers

	mov	Y, OLD_Y
	ldr	INC_Y, OLD_INC_Y

        movs    r4, #0                                          // clear floating point register
        vmov    s0, r4
        vmov    s1, r4
        vcvt.f64.f32    d0, s0
        vcvt.f64.f32    d1, s1


	cmp	N, #0
	ble	ddot_kernel_L999

	cmp	INC_X, #0
	beq	ddot_kernel_L999

	cmp	INC_Y, #0
	beq	ddot_kernel_L999

	cmp	INC_X, #1
	bne	ddot_kernel_S_BEGIN

	cmp	INC_Y, #1
	bne	ddot_kernel_S_BEGIN

ddot_kernel_F_BEGIN:

	asrs	I, N, #2					// I = N / 4
	ble	ddot_kernel_F1

ddot_kernel_F4:

	KERNEL_F4

	subs	I, I, #1
	ble	ddot_kernel_F1


	KERNEL_F4

	subs	I, I, #1
	bne	ddot_kernel_F4

ddot_kernel_F1:

	ands	I, N, #3
	ble	ddot_kernel_L999

ddot_kernel_F10:

	KERNEL_F1

	subs    I, I, #1
        bne     ddot_kernel_F10

	b	ddot_kernel_L999

ddot_kernel_S_BEGIN:

	lsl	INC_X, INC_X, #3				// INC_X * SIZE
	lsl	INC_Y, INC_Y, #3				// INC_Y * SIZE

	asrs	I, N, #2					// I = N / 4
	ble	ddot_kernel_S1

ddot_kernel_S4:

	KERNEL_S4

	subs	I, I, #1
	bne	ddot_kernel_S4

ddot_kernel_S1:

	ands	I, N, #3
	ble	ddot_kernel_L999

ddot_kernel_S10:

	KERNEL_S1

	subs    I, I, #1
        bne     ddot_kernel_S10






ddot_kernel_L999:

	sub	r3, fp, #128
	vldm	r3, { d8 - d15}					// restore floating point registers

	vadd.f64	d0 , d0, d1				// set return value
	sub	sp, fp, #24
	pop	{r4 - r9, fp}
	bx	lr

	EPILOGUE

