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/* * 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 */