1 files changed, 65 insertions, 0 deletions
diff --git a/libc/string/metag/strcmp.S b/libc/string/metag/strcmp.S
new file mode 100644
index 000000000..3278ffaa5
--- /dev/null
+++ b/libc/string/metag/strcmp.S
@@ -0,0 +1,65 @@
+!    Copyright (C) 2013 Imagination Technologies Ltd.
+
+!    Licensed under LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+
+
+#include <features.h>
+
+	.text
+	.global	_strcmp
+	.type	_strcmp,function
+!D1Ar1 s1
+!D0Ar2 s2
+_strcmp:
+	TST	D1Ar1,#3
+	TSTZ	D0Ar2,#3
+	MOVT	D1Re0,#0x0101
+	ADD	D1Re0,D1Re0,#0x0101
+	BNZ	$Lstrcmp_slow
+	GETD	D1Ar3,[D1Ar1+#4++]	! Load 32-bits from s1
+	GETD	D1Ar5,[D0Ar2+#4++]      ! Load 32-bits from s2
+	LSL	D0FrT,D1Re0,#7		! D0FrT = 0x80808080
+$Lstrcmp4_loop:
+	SUB	D0Re0,D1Ar3,D1Re0	! D1Re0 = 0x01010101
+	MOV	D0Ar6,D1Ar3
+	SUBS	D0Ar4,D1Ar3,D1Ar5	! Calculate difference
+	XOR	D0Ar6,D0Ar6,#-1
+	GETD	D1Ar3,[D1Ar1+#4++]	! Load 32-bits from s1
+	AND	D0Re0,D0Re0,D0Ar6
+	ANDSZ	D0Ar6,D0Re0,D0FrT	! D0FrT = 0x80808080
+	GETD	D1Ar5,[D0Ar2+#4++]      ! Load 32-bits from s2
+	BZ	$Lstrcmp4_loop
+	AND	D0Ar6, D0Re0, D0FrT	! D0FrT = 0x80808080
+!
+! Either they are different or they both contain a NULL + junk
+!
+$Lstrcmp4_end:
+	LSLS	D0Re0,D0Ar4,#24		! Was Byte[0] the same?
+	LSLSZ	D0Ar2,D0Ar6,#24		! Yes: AND they where not zero?
+	LSLSZ	D0Re0,D0Ar4,#16		! Yes: Was Byte[1] the same?
+	LSLSZ	D0Ar2,D0Ar6,#16		! Yes: AND they where not zero?
+	LSLSZ	D0Re0,D0Ar4,#8		! Tes: Was Byte[2] the same?
+	LSLSZ	D0Ar2,D0Ar6,#8		! Yes: AND they where not zero?
+	MOVZ	D0Re0,D0Ar4		! Yes: Must by Byte[3] thats the result
+	ASR	D0Re0,D0Re0,#24		! Sign extend result to integer
+	MOV	PC,D1RtP
+!
+! Misaligned case, byte at a time
+!
+$Lstrcmp_slow:
+	GETB	D1Ar3,[D1Ar1++]		! Load char from s1
+	GETB	D1Ar5,[D0Ar2++]         ! Load char from s2
+	CMP	D1Ar3,#1		! Null -> C and NZ, rest -> NC (\1->Z)
+	CMPNC	D1Ar3,D1Ar5		! NOT Null: Same -> Z, else -> NZ
+	BZ	$Lstrcmp_slow		! NOT Null and Same: Loop
+	SUB	D0Re0,D1Ar3,D1Ar5	! Generate result
+	MOV	PC,D1RtP
+
+        .size _strcmp,.-_strcmp
+
+
+libc_hidden_def(strcmp)
+#ifndef __UCLIBC_HAS_LOCALE__
+strong_alias(strcmp,strcoll)
+libc_hidden_def(strcoll)
+#endif