1 files changed, 68 insertions, 0 deletions
diff --git a/sysdeps/i386/memset.S b/sysdeps/i386/memset.S
new file mode 100644
index 0000000000..07b0911988
--- /dev/null
+++ b/sysdeps/i386/memset.S
@@ -0,0 +1,68 @@
+/* memset with REP MOVSB/STOSB
+   Copyright (C) 2015-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <sysdep.h>
+
+#define CFI_PUSH(REG)						\
+  cfi_adjust_cfa_offset (4);					\
+  cfi_rel_offset (REG, 0)
+
+#define CFI_POP(REG)						\
+  cfi_adjust_cfa_offset (-4);					\
+  cfi_restore (REG)
+
+#define PUSH(REG)	pushl REG; CFI_PUSH (REG)
+#define POP(REG)	popl REG; CFI_POP (REG)
+
+#define STR1  8
+#ifdef USE_AS_BZERO
+#define N     STR1+4
+#else
+#define STR2  STR1+4
+#define N     STR2+4
+#endif
+
+	.text
+#if defined SHARED && IS_IN (libc) && !defined USE_AS_BZERO
+ENTRY (__memset_chk)
+	movl	12(%esp), %eax
+	cmpl	%eax, 16(%esp)
+	jb	HIDDEN_JUMPTARGET (__chk_fail)
+END (__memset_chk)
+#endif
+ENTRY (memset)
+	PUSH    (%edi)
+	movl	N(%esp), %ecx
+	movl	STR1(%esp), %edi
+#ifdef USE_AS_BZERO
+	xor	%eax, %eax
+#else
+	movzbl	STR2(%esp), %eax
+	mov	%edi, %edx
+#endif
+	rep	stosb
+#ifndef USE_AS_BZERO
+	mov	%edx, %eax
+#endif
+	POP     (%edi)
+	ret
+END (memset)
+
+#ifndef USE_AS_BZERO
+libc_hidden_builtin_def (memset)
+#endif