OpenBLAS/kernel/arm64/sum.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
*******************************************************************************/

#if !defined(DOUBLE)
#define REG0	wzr
#define SUMF	s0
#define TMPF	s1
#define TMPVF	{v1.s}[0]
#define SZ	4
#else
#define REG0	xzr
#define SUMF	d0
#define TMPF	d1
#define TMPVF	{v1.d}[0]
#define SZ	8
#endif

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

.macro KERNEL_F1
	ldr	TMPF, [X], #SZ
	fadd	SUMF, SUMF, TMPF
.endm

.macro KERNEL_F8
#if !defined(DOUBLE)
	ld1	{v1.4s, v2.4s}, [X], #32	// Load [X3, X2, X1, X0]
	fadd	v1.4s, v1.4s, v2.4s		// [X3+X1, X2+X0]
	fadd	v0.4s, v0.4s, v1.4s		// [X3+X1, X2+X0]
	PRFM	PLDL1KEEP, [X, #1024]
#else // DOUBLE
	ld1	{v2.2d, v3.2d, v4.2d, v5.2d}, [X]
	add	X, X, #64

	PRFM	PLDL1KEEP, [X, #1024]

	fadd	v2.2d, v2.2d, v3.2d
	fadd	v4.2d, v4.2d, v5.2d
	fadd	v0.2d, v0.2d, v2.2d
	fadd	v0.2d, v0.2d, v4.2d
#endif
.endm

.macro KERNEL_F8_FINALIZE
#if !defined(DOUBLE)
	ext	v1.16b, v0.16b, v0.16b, #8
	fadd	v0.2s, v0.2s, v1.2s
	faddp	SUMF, v0.2s
#else
	faddp	SUMF, v0.2d
#endif
.endm

.macro INIT_S
#if !defined(DOUBLE)
	lsl	INC_X, INC_X, #2
#else
	lsl	INC_X, INC_X, #3
#endif
.endm

.macro KERNEL_S1
	ld1	TMPVF, [X], INC_X
	fadd	SUMF, SUMF, TMPF
.endm

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

	PROLOGUE

	fmov	SUMF, REG0
#if !defined(DOUBLE)
	fmov	s1, SUMF
#else
	fmov	d1, SUMF
#endif

	cmp	N, xzr
	ble	.Lsum_kernel_L999
	cmp	INC_X, xzr
	ble	.Lsum_kernel_L999

	cmp	INC_X, #1
	bne	.Lsum_kernel_S_BEGIN

.Lsum_kernel_F_BEGIN:

	asr	I, N, #3
	cmp	I, xzr
	beq	.Lsum_kernel_F1

.Lsum_kernel_F8:

	KERNEL_F8

	subs	I, I, #1
	bne	.Lsum_kernel_F8

	KERNEL_F8_FINALIZE

.Lsum_kernel_F1:

	ands	I, N, #7
	ble	.Lsum_kernel_L999

.Lsum_kernel_F10:

	KERNEL_F1

	subs    I, I, #1
        bne     .Lsum_kernel_F10

.Lsum_kernel_L999:
	ret

.Lsum_kernel_S_BEGIN:

	INIT_S

	asr	I, N, #2
	cmp	I, xzr
	ble	.Lsum_kernel_S1

.Lsum_kernel_S4:

	KERNEL_S1
	KERNEL_S1
	KERNEL_S1
	KERNEL_S1

	subs	I, I, #1
	bne	.Lsum_kernel_S4

.Lsum_kernel_S1:

	ands	I, N, #3
	ble	.Lsum_kernel_L999

.Lsum_kernel_S10:

	KERNEL_S1

	subs    I, I, #1
        bne     .Lsum_kernel_S10

	ret

	EPILOGUE