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 14#include <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 */ 154