[mirror_ubuntu-artful-kernel.git] / arch / xtensa / include / asm / asmmacro.h

/*
 * include/asm-xtensa/asmmacro.h
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2005 Tensilica Inc.
 */

#ifndef _XTENSA_ASMMACRO_H
#define _XTENSA_ASMMACRO_H

#include <variant/core.h>

/*
 * Some little helpers for loops. Use zero-overhead-loops
 * where applicable and if supported by the processor.
 *
 * __loopi ar, at, size, inc
 *         ar	register initialized with the start address
 *	   at	scratch register used by macro
 *	   size	size immediate value
 *	   inc	increment
 *
 * __loops ar, as, at, inc_log2[, mask_log2][, cond][, ncond]
 *	   ar	register initialized with the start address
 *	   as	register initialized with the size
 *	   at	scratch register use by macro
 *	   inc_log2	increment [in log2]
 *	   mask_log2	mask [in log2]
 *	   cond		true condition (used in loop'cond')
 *	   ncond	false condition (used in b'ncond')
 *
 * __loop  as
 *	   restart loop. 'as' register must not have been modified!
 *
 * __endla ar, as, incr
 *	   ar	start address (modified)
 *	   as	scratch register used by __loops/__loopi macros or
 *		end address used by __loopt macro
 *	   inc	increment
 */

/*
 * loop for given size as immediate
 */

	.macro	__loopi ar, at, size, incr

#if XCHAL_HAVE_LOOPS
		movi	\at, ((\size + \incr - 1) / (\incr))
		loop	\at, 99f
#else
		addi	\at, \ar, \size
		98:
#endif

	.endm

/*
 * loop for given size in register
 */

	.macro	__loops	ar, as, at, incr_log2, mask_log2, cond, ncond

#if XCHAL_HAVE_LOOPS
		.ifgt \incr_log2 - 1
			addi	\at, \as, (1 << \incr_log2) - 1
			.ifnc \mask_log2,
				extui	\at, \at, \incr_log2, \mask_log2
			.else
				srli	\at, \at, \incr_log2
			.endif
		.endif
		loop\cond	\at, 99f
#else
		.ifnc \mask_log2,
			extui	\at, \as, \incr_log2, \mask_log2
		.else
			.ifnc \ncond,
				srli	\at, \as, \incr_log2
			.endif
		.endif
		.ifnc \ncond,
			b\ncond	\at, 99f

		.endif
		.ifnc \mask_log2,
			slli	\at, \at, \incr_log2
			add	\at, \ar, \at
		.else
			add	\at, \ar, \as
		.endif
#endif
		98:

	.endm

/*
 * loop from ar to as
 */

	.macro	__loopt	ar, as, at, incr_log2

#if XCHAL_HAVE_LOOPS
		sub	\at, \as, \ar
		.ifgt	\incr_log2 - 1
			addi	\at, \at, (1 << \incr_log2) - 1
			srli	\at, \at, \incr_log2
		.endif
		loop	\at, 99f
#else
		98:
#endif

	.endm

/*
 * restart loop. registers must be unchanged
 */

	.macro	__loop	as

#if XCHAL_HAVE_LOOPS
		loop	\as, 99f
#else
		98:
#endif

	.endm

/*
 * end of loop with no increment of the address.
 */

	.macro	__endl	ar, as
#if !XCHAL_HAVE_LOOPS
		bltu	\ar, \as, 98b
#endif
		99:
	.endm

/*
 * end of loop with increment of the address.
 */

	.macro	__endla	ar, as, incr
		addi	\ar, \ar, \incr
		__endl	\ar \as
	.endm


#endif /* _XTENSA_ASMMACRO_H */
Commit	Line	Data
173d6681 CZ	1	/*
	2	* include/asm-xtensa/asmmacro.h
	3	*
	4	* This file is subject to the terms and conditions of the GNU General Public
	5	* License. See the file "COPYING" in the main directory of this archive
	6	* for more details.
	7	*
	8	* Copyright (C) 2005 Tensilica Inc.
	9	*/
	10
	11	#ifndef _XTENSA_ASMMACRO_H
	12	#define _XTENSA_ASMMACRO_H
	13
367b8112	14	#include <variant/core.h>
173d6681 CZ	15
	16	/*
	17	* Some little helpers for loops. Use zero-overhead-loops
	18	* where applicable and if supported by the processor.
	19	*
	20	* __loopi ar, at, size, inc
	21	* ar register initialized with the start address
	22	* at scratch register used by macro
	23	* size size immediate value
	24	* inc increment
	25	*
	26	* __loops ar, as, at, inc_log2[, mask_log2][, cond][, ncond]
	27	* ar register initialized with the start address
	28	* as register initialized with the size
	29	* at scratch register use by macro
	30	* inc_log2 increment [in log2]
	31	* mask_log2 mask [in log2]
	32	* cond true condition (used in loop'cond')
	33	* ncond false condition (used in b'ncond')
	34	*
	35	* __loop as
	36	* restart loop. 'as' register must not have been modified!
	37	*
5029615e	38	* __endla ar, as, incr
173d6681	39	* ar start address (modified)
5029615e MF	40	* as scratch register used by __loops/__loopi macros or
5029615e MF	41	* end address used by __loopt macro
173d6681 CZ	42	* inc increment
	43	*/
	44
	45	/*
	46	* loop for given size as immediate
	47	*/
	48
	49	.macro __loopi ar, at, size, incr
	50
	51	#if XCHAL_HAVE_LOOPS
	52	movi \at, ((\size + \incr - 1) / (\incr))
	53	loop \at, 99f
	54	#else
	55	addi \at, \ar, \size
	56	98:
	57	#endif
	58
	59	.endm
	60
	61	/*
	62	* loop for given size in register
	63	*/
	64
	65	.macro __loops ar, as, at, incr_log2, mask_log2, cond, ncond
	66
	67	#if XCHAL_HAVE_LOOPS
	68	.ifgt \incr_log2 - 1
	69	addi \at, \as, (1 << \incr_log2) - 1
	70	.ifnc \mask_log2,
	71	extui \at, \at, \incr_log2, \mask_log2
	72	.else
	73	srli \at, \at, \incr_log2
	74	.endif
	75	.endif
	76	loop\cond \at, 99f
	77	#else
	78	.ifnc \mask_log2,
	79	extui \at, \as, \incr_log2, \mask_log2
	80	.else
	81	.ifnc \ncond,
	82	srli \at, \as, \incr_log2
	83	.endif
	84	.endif
	85	.ifnc \ncond,
	86	b\ncond \at, 99f
	87
	88	.endif
	89	.ifnc \mask_log2,
	90	slli \at, \at, \incr_log2
	91	add \at, \ar, \at
	92	.else
	93	add \at, \ar, \as
	94	.endif
	95	#endif
	96	98:
	97
	98	.endm
	99
	100	/*
5029615e	101	* loop from ar to as
173d6681 CZ	102	*/
	103
	104	.macro __loopt ar, as, at, incr_log2
	105
	106	#if XCHAL_HAVE_LOOPS
	107	sub \at, \as, \ar
	108	.ifgt \incr_log2 - 1
	109	addi \at, \at, (1 << \incr_log2) - 1
	110	srli \at, \at, \incr_log2
	111	.endif
	112	loop \at, 99f
	113	#else
	114	98:
	115	#endif
	116
	117	.endm
	118
	119	/*
	120	* restart loop. registers must be unchanged
	121	*/
	122
	123	.macro __loop as
	124
	125	#if XCHAL_HAVE_LOOPS
	126	loop \as, 99f
	127	#else
	128	98:
	129	#endif
	130
	131	.endm
	132
	133	/*
	134	* end of loop with no increment of the address.
	135	*/
	136
	137	.macro __endl ar, as
	138	#if !XCHAL_HAVE_LOOPS
	139	bltu \ar, \as, 98b
	140	#endif
	141	99:
	142	.endm
	143
	144	/*
	145	* end of loop with increment of the address.
	146	*/
	147
	148	.macro __endla ar, as, incr
	149	addi \ar, \ar, \incr
	150	__endl \ar \as
	151	.endm
	152
	153
	154	#endif /* _XTENSA_ASMMACRO_H */