diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/xtensa/lib/memset.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/xtensa/lib/memset.S | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/ANDROID_3.4.5/arch/xtensa/lib/memset.S b/ANDROID_3.4.5/arch/xtensa/lib/memset.S deleted file mode 100644 index 10b8c400..00000000 --- a/ANDROID_3.4.5/arch/xtensa/lib/memset.S +++ /dev/null @@ -1,160 +0,0 @@ -/* - * arch/xtensa/lib/memset.S - * - * ANSI C standard library function memset - * (Well, almost. .fixup code might return zero.) - * - * 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) 2002 Tensilica Inc. - */ - -#include <variant/core.h> - -/* - * void *memset(void *dst, int c, size_t length) - * - * The algorithm is as follows: - * Create a word with c in all byte positions - * If the destination is aligned, - * do 16B chucks with a loop, and then finish up with - * 8B, 4B, 2B, and 1B stores conditional on the length. - * If destination is unaligned, align it by conditionally - * setting 1B and 2B and then go to aligned case. - * This code tries to use fall-through branches for the common - * case of an aligned destination (except for the branches to - * the alignment labels). - */ - -/* Load or store instructions that may cause exceptions use the EX macro. */ - -#define EX(insn,reg1,reg2,offset,handler) \ -9: insn reg1, reg2, offset; \ - .section __ex_table, "a"; \ - .word 9b, handler; \ - .previous - - -.text -.align 4 -.global memset -.type memset,@function -memset: - entry sp, 16 # minimal stack frame - # a2/ dst, a3/ c, a4/ length - extui a3, a3, 0, 8 # mask to just 8 bits - slli a7, a3, 8 # duplicate character in all bytes of word - or a3, a3, a7 # ... - slli a7, a3, 16 # ... - or a3, a3, a7 # ... - mov a5, a2 # copy dst so that a2 is return value - movi a6, 3 # for alignment tests - bany a2, a6, .Ldstunaligned # if dst is unaligned -.L0: # return here from .Ldstunaligned when dst is aligned - srli a7, a4, 4 # number of loop iterations with 16B - # per iteration - bnez a4, .Laligned - retw - -/* - * Destination is word-aligned. - */ - # set 16 bytes per iteration for word-aligned dst - .align 4 # 1 mod 4 alignment for LOOPNEZ - .byte 0 # (0 mod 4 alignment for LBEG) -.Laligned: -#if XCHAL_HAVE_LOOPS - loopnez a7, .Loop1done -#else /* !XCHAL_HAVE_LOOPS */ - beqz a7, .Loop1done - slli a6, a7, 4 - add a6, a6, a5 # a6 = end of last 16B chunk -#endif /* !XCHAL_HAVE_LOOPS */ -.Loop1: - EX(s32i, a3, a5, 0, memset_fixup) - EX(s32i, a3, a5, 4, memset_fixup) - EX(s32i, a3, a5, 8, memset_fixup) - EX(s32i, a3, a5, 12, memset_fixup) - addi a5, a5, 16 -#if !XCHAL_HAVE_LOOPS - blt a5, a6, .Loop1 -#endif /* !XCHAL_HAVE_LOOPS */ -.Loop1done: - bbci.l a4, 3, .L2 - # set 8 bytes - EX(s32i, a3, a5, 0, memset_fixup) - EX(s32i, a3, a5, 4, memset_fixup) - addi a5, a5, 8 -.L2: - bbci.l a4, 2, .L3 - # set 4 bytes - EX(s32i, a3, a5, 0, memset_fixup) - addi a5, a5, 4 -.L3: - bbci.l a4, 1, .L4 - # set 2 bytes - EX(s16i, a3, a5, 0, memset_fixup) - addi a5, a5, 2 -.L4: - bbci.l a4, 0, .L5 - # set 1 byte - EX(s8i, a3, a5, 0, memset_fixup) -.L5: -.Lret1: - retw - -/* - * Destination is unaligned - */ - -.Ldstunaligned: - bltui a4, 8, .Lbyteset # do short copies byte by byte - bbci.l a5, 0, .L20 # branch if dst alignment half-aligned - # dst is only byte aligned - # set 1 byte - EX(s8i, a3, a5, 0, memset_fixup) - addi a5, a5, 1 - addi a4, a4, -1 - # now retest if dst aligned - bbci.l a5, 1, .L0 # if now aligned, return to main algorithm -.L20: - # dst half-aligned - # set 2 bytes - EX(s16i, a3, a5, 0, memset_fixup) - addi a5, a5, 2 - addi a4, a4, -2 - j .L0 # dst is now aligned, return to main algorithm - -/* - * Byte by byte set - */ - .align 4 - .byte 0 # 1 mod 4 alignment for LOOPNEZ - # (0 mod 4 alignment for LBEG) -.Lbyteset: -#if XCHAL_HAVE_LOOPS - loopnez a4, .Lbytesetdone -#else /* !XCHAL_HAVE_LOOPS */ - beqz a4, .Lbytesetdone - add a6, a5, a4 # a6 = ending address -#endif /* !XCHAL_HAVE_LOOPS */ -.Lbyteloop: - EX(s8i, a3, a5, 0, memset_fixup) - addi a5, a5, 1 -#if !XCHAL_HAVE_LOOPS - blt a5, a6, .Lbyteloop -#endif /* !XCHAL_HAVE_LOOPS */ -.Lbytesetdone: - retw - - - .section .fixup, "ax" - .align 4 - -/* We return zero if a failure occurred. */ - -memset_fixup: - movi a2, 0 - retw |