OpenBLAS/kernel/arm64/zsum.S

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

#define ASSEMBLER
#include "common.h"

#define	N	x0	/* vector length */
#define	X	x1	/* X vector address */
#define	INC_X	x2	/* X stride */
#define I	x5	/* loop variable */

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

#define REG0	xzr
#define SUMF	d0
#define TMPF	d1
#define TMPVF	{v1.d}[0]
#define SZ	8

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

.macro KERNEL_F1
	ld1	{v1.2d}, [X], #16
	faddp	TMPF, v1.2d
	fadd	SUMF, SUMF, TMPF
.endm

.macro KERNEL_F4
	ld1	{v1.2d, v2.2d, v3.2d, v4.2d}, [X], #64

	fadd	v1.2d, v1.2d, v2.2d
	fadd	v3.2d, v3.2d, v4.2d

	fadd	v0.2d, v0.2d, v1.2d
	fadd	v0.2d, v0.2d, v3.2d

	PRFM	PLDL1KEEP, [X, #1024]
.endm

.macro KERNEL_F4_FINALIZE
	faddp	SUMF, v0.2d
.endm

.macro INIT_S
	lsl	INC_X, INC_X, #4
.endm

.macro KERNEL_S1
	ld1	{v1.2d}, [X], INC_X
	faddp	TMPF, v1.2d
	fadd	SUMF, SUMF, TMPF
.endm

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

	PROLOGUE

	fmov	SUMF, REG0

	cmp	N, xzr
	ble	.Lzsum_kernel_L999
	cmp	INC_X, xzr
	ble	.Lzsum_kernel_L999

	cmp	INC_X, #1
	bne	.Lzsum_kernel_S_BEGIN

.Lzsum_kernel_F_BEGIN:

	asr	I, N, #2
	cmp	I, xzr
	beq	.Lzsum_kernel_F1

.Lzsum_kernel_F4:

	KERNEL_F4

	subs	I, I, #1
	bne	.Lzsum_kernel_F4

	KERNEL_F4_FINALIZE

.Lzsum_kernel_F1:

	ands	I, N, #3
	ble	.Lzsum_kernel_L999

.Lzsum_kernel_F10:

	KERNEL_F1

	subs    I, I, #1
        bne     .Lzsum_kernel_F10

.Lzsum_kernel_L999:
	ret

.Lzsum_kernel_S_BEGIN:

	INIT_S

	asr	I, N, #2
	cmp	I, xzr
	ble	.Lzsum_kernel_S1

.Lzsum_kernel_S4:

	KERNEL_S1
	KERNEL_S1
	KERNEL_S1
	KERNEL_S1

	subs	I, I, #1
	bne	.Lzsum_kernel_S4

.Lzsum_kernel_S1:

	ands	I, N, #3
	ble	.Lzsum_kernel_L999

.Lzsum_kernel_S10:

	KERNEL_S1

	subs    I, I, #1
        bne     .Lzsum_kernel_S10

	ret

	EPILOGUE