[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/sysdeps/i386/stpcpy.S b/ap/libc/glibc/glibc-2.23/sysdeps/i386/stpcpy.S
new file mode 100644
index 0000000..7999e95
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/sysdeps/i386/stpcpy.S
@@ -0,0 +1,88 @@
+/* Copy SRC to DEST returning the address of the terminating '\0' in DEST.
+ For Intel 80x86, x>=3.
+ Copyright (C) 1994-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper (drepper@gnu.ai.mit.edu).
+
+ 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/>. */
+
+/* This function is defined neither in ANSI nor POSIX standards but is
+ also not invented here. */
+
+#include <sysdep.h>
+#include "asm-syntax.h"
+
+#define PARMS 4 /* no space for saved regs */
+#define RTN PARMS
+#define DEST RTN
+#define SRC DEST+4
+
+ .text
+ENTRY (__stpcpy)
+
+ movl DEST(%esp), %eax
+ movl SRC(%esp), %ecx
+ subl %eax, %ecx /* magic: reduce number of loop variants
+ to one using addressing mode */
+
+ /* Here we would like to write
+
+ subl $4, %eax
+ ALIGN (4)
+
+ but the assembler is too smart and optimizes for the shortest
+ form where the number only needs one byte. But if we could
+ have the long form we would not need the alignment. */
+
+ .byte 0x81, 0xe8 /* This is `subl $0x00000004, %eax' */
+ .long 0x00000004
+
+ /* Four times unfolded loop with only one loop counter. This
+ is achieved by the use of index+base addressing mode. As the
+ loop counter we use the destination address because this is
+ also the result. */
+L(1): addl $4, %eax /* increment loop counter */
+
+ movb (%eax,%ecx), %dl /* load current char */
+ movb %dl, (%eax) /* and store it */
+ testb %dl, %dl /* was it NUL? */
+ jz L(2) /* yes, then exit */
+
+ movb 1(%eax,%ecx), %dl /* load current char */
+ movb %dl, 1(%eax) /* and store it */
+ testb %dl, %dl /* was it NUL? */
+ jz L(3) /* yes, then exit */
+
+ movb 2(%eax,%ecx), %dl /* load current char */
+ movb %dl, 2(%eax) /* and store it */
+ testb %dl, %dl /* was it NUL? */
+ jz L(4) /* yes, then exit */
+
+ movb 3(%eax,%ecx), %dl /* load current char */
+ movb %dl, 3(%eax) /* and store it */
+ testb %dl, %dl /* was it NUL? */
+ jnz L(1) /* no, then continue loop */
+
+ incl %eax /* correct loop counter */
+L(4): incl %eax
+L(3): incl %eax
+L(2):
+
+ ret
+END (__stpcpy)
+
+weak_alias (__stpcpy, stpcpy)
+libc_hidden_def (__stpcpy)
+libc_hidden_builtin_def (stpcpy)