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Diffstat (limited to 'ports/sysdeps/ia64/strlen.S')
| -rw-r--r-- | ports/sysdeps/ia64/strlen.S | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/ports/sysdeps/ia64/strlen.S b/ports/sysdeps/ia64/strlen.S deleted file mode 100644 index 5930af7b32..0000000000 --- a/ports/sysdeps/ia64/strlen.S +++ /dev/null @@ -1,97 +0,0 @@ -/* Optimized version of the standard strlen() function. - This file is part of the GNU C Library. - Copyright (C) 2000-2014 Free Software Foundation, Inc. - Contributed by Dan Pop <Dan.Pop@cern.ch>. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -/* Return: the length of the input string - - Input: - in0: str - - Look for the null character byte by byte, until we reach a word aligned - address, then search word by word, using the czx instruction. We're - also doing one word of read ahead, which could cause problems if the - null character is on the last word of a page and the next page is not - mapped in the process address space. Hence the use of the speculative - load. - - This implementation assumes little endian mode. For big endian mode, - the instruction czx1.r should be replaced by czx1.l. */ - -#include <sysdep.h> -#undef ret - -#define saved_lc r18 -#define str r19 -#define pos0 r20 -#define val1 r21 -#define val2 r22 -#define origadd r23 -#define tmp r24 -#define loopcnt r30 -#define len ret0 - -ENTRY(strlen) - .prologue - alloc r2 = ar.pfs, 1, 0, 0, 0 - .save ar.lc, saved_lc - mov saved_lc = ar.lc // save the loop counter - .body - mov str = in0 - mov len = r0 // len = 0 - and tmp = 7, in0 // tmp = str % 8 - ;; - sub loopcnt = 8, tmp // loopcnt = 8 - tmp - cmp.eq p6, p0 = tmp, r0 -(p6) br.cond.sptk .str_aligned;; - adds loopcnt = -1, loopcnt;; - mov ar.lc = loopcnt -.l1: - ld1 val2 = [str], 1 - ;; - cmp.eq p6, p0 = val2, r0 -(p6) br.cond.spnt .restore_and_exit - adds len = 1, len - br.cloop.dptk .l1 -.str_aligned: - mov origadd = str // origadd = orig - ld8 val1 = [str], 8;; - nop.b 0 - nop.b 0 -.l2: ld8.s val2 = [str], 8 // don't bomb out here - czx1.r pos0 = val1 - ;; - cmp.ne p6, p0 = 8, pos0 -(p6) br.cond.spnt .foundit - chk.s val2, .recovery -.back: - mov val1 = val2 - br.cond.dptk .l2 -.foundit: - sub tmp = str, origadd // tmp = crt address - orig - add len = len, pos0;; - add len = len, tmp;; - adds len = -16, len -.restore_and_exit: - mov ar.lc = saved_lc // restore the loop counter - br.ret.sptk.many b0 -.recovery: - adds str = -8, str;; - ld8 val2 = [str], 8 // bomb out here - br.cond.sptk .back -END(strlen) -libc_hidden_builtin_def (strlen) |