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Chris Zankel173d66812006-12-10 02:18:48 -08001/*
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
14#include <asm/variant/core.h>
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 *
38 * __endla ar, at, incr
39 * ar start address (modified)
40 * as scratch register used by macro
41 * inc increment
42 */
43
44/*
45 * loop for given size as immediate
46 */
47
48 .macro __loopi ar, at, size, incr
49
50#if XCHAL_HAVE_LOOPS
51 movi \at, ((\size + \incr - 1) / (\incr))
52 loop \at, 99f
53#else
54 addi \at, \ar, \size
55 98:
56#endif
57
58 .endm
59
60/*
61 * loop for given size in register
62 */
63
64 .macro __loops ar, as, at, incr_log2, mask_log2, cond, ncond
65
66#if XCHAL_HAVE_LOOPS
67 .ifgt \incr_log2 - 1
68 addi \at, \as, (1 << \incr_log2) - 1
69 .ifnc \mask_log2,
70 extui \at, \at, \incr_log2, \mask_log2
71 .else
72 srli \at, \at, \incr_log2
73 .endif
74 .endif
75 loop\cond \at, 99f
76#else
77 .ifnc \mask_log2,
78 extui \at, \as, \incr_log2, \mask_log2
79 .else
80 .ifnc \ncond,
81 srli \at, \as, \incr_log2
82 .endif
83 .endif
84 .ifnc \ncond,
85 b\ncond \at, 99f
86
87 .endif
88 .ifnc \mask_log2,
89 slli \at, \at, \incr_log2
90 add \at, \ar, \at
91 .else
92 add \at, \ar, \as
93 .endif
94#endif
95 98:
96
97 .endm
98
99/*
100 * loop from ar to ax
101 */
102
103 .macro __loopt ar, as, at, incr_log2
104
105#if XCHAL_HAVE_LOOPS
106 sub \at, \as, \ar
107 .ifgt \incr_log2 - 1
108 addi \at, \at, (1 << \incr_log2) - 1
109 srli \at, \at, \incr_log2
110 .endif
111 loop \at, 99f
112#else
113 98:
114#endif
115
116 .endm
117
118/*
119 * restart loop. registers must be unchanged
120 */
121
122 .macro __loop as
123
124#if XCHAL_HAVE_LOOPS
125 loop \as, 99f
126#else
127 98:
128#endif
129
130 .endm
131
132/*
133 * end of loop with no increment of the address.
134 */
135
136 .macro __endl ar, as
137#if !XCHAL_HAVE_LOOPS
138 bltu \ar, \as, 98b
139#endif
140 99:
141 .endm
142
143/*
144 * end of loop with increment of the address.
145 */
146
147 .macro __endla ar, as, incr
148 addi \ar, \ar, \incr
149 __endl \ar \as
150 .endm
151
152
153#endif /* _XTENSA_ASMMACRO_H */