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authorChris Metcalf <cmetcalf@tilera.com>2014-02-10 10:54:47 -0500
committerChris Metcalf <cmetcalf@tilera.com>2014-02-10 11:04:39 -0500
commit4372980f5881e7d537a52e3c49588ce116088061 (patch)
tree138fbc88313c8cb0cabee393e0c08afd67dac6f1 /sysdeps/tile/tilepro/strlen.c
parenta1ffb40e32741f992c743e7b16c061fefa3747ac (diff)
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Move tilegx, tilepro, and linux-generic from ports to libc.
I've moved the TILE-Gx and TILEPro ports to the main sysdeps hierarchy,
along with the linux-generic ports infrastructure.  Beyond the README
update, the move was just

    git mv ports/sysdeps/tile sysdeps/tile
    git mv ports/sysdeps/unix/sysv/linux/tile \
      sysdeps/unix/sysv/linux/tile
    git mv ports/sysdeps/unix/sysv/linux/generic \
      sysdeps/unix/sysv/linux/generic

I updated the relevant ChangeLogs along the lines of the ARM move
in commit c6bfe5c4d75 and tested the 64-bit tilegx build to confirm that
there were no changes in "objdump -dr" output in the shared objects.
Diffstat (limited to 'sysdeps/tile/tilepro/strlen.c')
-rw-r--r--sysdeps/tile/tilepro/strlen.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/sysdeps/tile/tilepro/strlen.c b/sysdeps/tile/tilepro/strlen.c
new file mode 100644
index 0000000000..c40ee56c6f
--- /dev/null
+++ b/sysdeps/tile/tilepro/strlen.c
@@ -0,0 +1,39 @@
+/* Copyright (C) 2011-2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
+
+   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/>.  */
+
+#include <string.h>
+#include <stdint.h>
+
+size_t
+strlen (const char *s)
+{
+  /* Get an aligned pointer. */
+  const uintptr_t s_int = (uintptr_t) s;
+  const uint32_t *p = (const uint32_t *) (s_int & -4);
+
+  /* Read the first word, but force bytes before the string to be nonzero.
+     This expression works because we know shift counts are taken mod 32.  */
+  uint32_t v = *p | ((1 << (s_int << 3)) - 1);
+
+  uint32_t bits;
+  while ((bits = __insn_seqb (v, 0)) == 0)
+    v = *++p;
+
+  return ((const char *) p) + (__insn_ctz (bits) >> 3) - s;
+}
+libc_hidden_builtin_def (strlen)