diff --git a/libc/arch-x86/string/ssse3-wcscat-atom.S b/libc/arch-x86/string/ssse3-wcscat-atom.S
new file mode 100644
index 0000000..17b0843
--- /dev/null
+++ b/libc/arch-x86/string/ssse3-wcscat-atom.S
@@ -0,0 +1,114 @@
+/*
+Copyright (c) 2011 Intel Corporation
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+    * this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above copyright notice,
+    * this list of conditions and the following disclaimer in the documentation
+    * and/or other materials provided with the distribution.
+
+    * Neither the name of Intel Corporation nor the names of its contributors
+    * may be used to endorse or promote products derived from this software
+    * without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef L
+# define L(label)	.L##label
+#endif
+
+#ifndef cfi_startproc
+# define cfi_startproc                  .cfi_startproc
+#endif
+
+#ifndef cfi_endproc
+# define cfi_endproc                    .cfi_endproc
+#endif
+
+#ifndef cfi_rel_offset
+# define cfi_rel_offset(reg, off)	.cfi_rel_offset reg, off
+#endif
+
+#ifndef cfi_restore
+# define cfi_restore(reg)	.cfi_restore reg
+#endif
+
+#ifndef cfi_adjust_cfa_offset
+# define cfi_adjust_cfa_offset(off)	.cfi_adjust_cfa_offset off
+#endif
+
+#ifndef ENTRY
+# define ENTRY(name)	\
+	.type name,  @function;	\
+	.globl name;	\
+	.p2align 4;	\
+name:	\
+	cfi_startproc
+#endif
+
+#ifndef END
+# define END(name)	\
+	cfi_endproc;	\
+	.size name, .-name
+#endif
+
+#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 PARMS  4
+#define STR1  PARMS+4
+#define STR2  STR1+4
+
+#define USE_AS_WCSCAT
+
+.text
+ENTRY (wcscat)
+	PUSH    (%edi)
+	mov	STR1(%esp), %edi
+	mov	%edi, %edx
+
+#define RETURN  jmp L(WcscpyAtom)
+#include "sse2-wcslen-atom.S"
+
+L(WcscpyAtom):
+	shl	$2, %eax
+	mov	STR2(%esp), %ecx
+	lea	(%edi, %eax), %edx
+
+	cmp	$0, (%ecx)
+	jz	L(Exit4)
+	cmp	$0, 4(%ecx)
+	jz	L(Exit8)
+	cmp	$0, 8(%ecx)
+	jz	L(Exit12)
+	cmp	$0, 12(%ecx)
+	jz	L(Exit16)
+
+#undef RETURN
+#define RETURN  POP(%edi);	ret;	CFI_PUSH(%edi)
+#include "ssse3-wcscpy-atom.S"
+
+END (wcscat)