aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/ia64/strlen.S
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/ia64/strlen.S')
-rw-r--r--sysdeps/ia64/strlen.S96
1 files changed, 0 insertions, 96 deletions
diff --git a/sysdeps/ia64/strlen.S b/sysdeps/ia64/strlen.S
deleted file mode 100644
index d5826bbc85..0000000000
--- a/sysdeps/ia64/strlen.S
+++ /dev/null
@@ -1,96 +0,0 @@
-/* Optimized version of the standard strlen() function.
- This file is part of the GNU C Library.
- Copyright (C) 2000-2024 Free Software Foundation, Inc.
-
- 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
- <https://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)