[git commit nptl] sh: add assembly strcpy and strncpy

[Giuseppe Cavallaro]

commit: http://git.uclibc.org/uClibc/commit/?id=815a7b0b6076c0708c305fd1fae297e004fe01de
branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/nptl

This patch adds the strcpy and strncpy assembly routines.
Benchmarks showed the following gains:
~7% for strcpy
~30% for strncpy

Note: uClibc string tests pass without any failures.

These functions have been only tested on SH4, for this reason
I've voluntarily added them within the sh4 sub-folder.
If somebody would like to test them on other SH CPUs, these can be moved
on sh common folder.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro at st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso at st.com>
---
 libc/string/sh/sh4/strcpy.S  |   28 +++++++++++++++++++++++++++
 libc/string/sh/sh4/strncpy.S |   43 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 0 deletions(-)
 create mode 100644 libc/string/sh/sh4/strcpy.S
 create mode 100644 libc/string/sh/sh4/strncpy.S

diff --git a/libc/string/sh/sh4/strcpy.S b/libc/string/sh/sh4/strcpy.S
new file mode 100644
index 0000000..0f82780
--- /dev/null
+++ b/libc/string/sh/sh4/strcpy.S
@@ -0,0 +1,28 @@
+/* strcpy implementation for SUPERH
+ *
+ * Copyright (C) 2009 STMicroelectronics Ltd.
+ *
+ * Author: Giuseppe Cavallaro <peppe.cavallaro at st.com>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/*
+	char *strcpy(char *dest, const char *src);
+ */
+
+#include <sysdep.h>
+
+ENTRY(strcpy)
+	mov	r4,r2
+1:
+	mov.b	@r5+,r1
+	tst	r1,r1
+	mov.b	r1, at r2
+	bf/s	1b
+	 add	#1,r2
+
+	rts
+	 mov	r4,r0
+END(strcpy)
+libc_hidden_def (strcpy)
diff --git a/libc/string/sh/sh4/strncpy.S b/libc/string/sh/sh4/strncpy.S
new file mode 100644
index 0000000..8a16f39
--- /dev/null
+++ b/libc/string/sh/sh4/strncpy.S
@@ -0,0 +1,43 @@
+/* strncpy implementation for SUPERH
+ *
+ * Copyright (C) 2009 STMicroelectronics Ltd.
+ *
+ * Author: Giuseppe Cavallaro <peppe.cavallaro at st.com>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/*
+	char *strncpy(char *dest, const char *src, size_t n);
+ */
+
+#include <sysdep.h>
+
+ENTRY(strncpy)
+	mov	#0,r0
+	bra	2f
+	 mov	r4,r2
+1:
+	mov.b	r1,@(r0,r2)
+	add	#1,r0
+2:
+	cmp/hs	r6,r0
+	bt	5f
+	mov.b	@(r0,r5),r1
+	tst	r1,r1
+	bf/s	1b
+	 cmp/hs	r6,r0
+	bra	4f
+	 nop
+3:
+	mov.b	r1,@(r0,r2)
+	add	#1,r0
+	cmp/hs	r6,r0
+4:
+	bf/s	3b
+	 mov	#0,r1
+5:
+	rts
+	 mov     r2,r0
+END(strncpy)
+libc_hidden_def(strncpy)
-- 
1.6.3.3