1 files changed, 80 insertions, 0 deletions

diff --git a/arch/sparc/lib/strlen.S b/arch/sparc/lib/strlen.S
new file mode 100644
index 000000000000..536f83507fbf
--- /dev/null
+++ b/arch/sparc/lib/strlen.S
@@ -0,0 +1,80 @@
+/* strlen.S: Sparc optimized strlen code
+ * Hand optimized from GNU libc's strlen
+ * Copyright (C) 1991,1996 Free Software Foundation
+ * Copyright (C) 1996,2008 David S. Miller (davem@davemloft.net)
+ * Copyright (C) 1996, 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#include <linux/linkage.h>
+#include <asm/asm.h>
+
+#define LO_MAGIC 0x01010101
+#define HI_MAGIC 0x80808080
+
+        .text
+ENTRY(strlen)
+        mov     %o0, %o1
+        andcc   %o0, 3, %g0
+        BRANCH32(be, pt, 9f)
+         sethi  %hi(HI_MAGIC), %o4
+        ldub    [%o0], %o5
+        BRANCH_REG_ZERO(pn, %o5, 11f)
+         add    %o0, 1, %o0
+        andcc   %o0, 3, %g0
+        BRANCH32(be, pn, 4f)
+         or     %o4, %lo(HI_MAGIC), %o3
+        ldub    [%o0], %o5
+        BRANCH_REG_ZERO(pn, %o5, 12f)
+         add    %o0, 1, %o0
+        andcc   %o0, 3, %g0
+        BRANCH32(be, pt, 5f)
+         sethi  %hi(LO_MAGIC), %o4
+        ldub    [%o0], %o5
+        BRANCH_REG_ZERO(pn, %o5, 13f)
+         add    %o0, 1, %o0
+        BRANCH32(ba, pt, 8f)
+         or     %o4, %lo(LO_MAGIC), %o2
+9:
+        or      %o4, %lo(HI_MAGIC), %o3
+4:
+        sethi   %hi(LO_MAGIC), %o4
+5:
+        or      %o4, %lo(LO_MAGIC), %o2
+8:
+        ld      [%o0], %o5
+2:
+        sub     %o5, %o2, %o4
+        andcc   %o4, %o3, %g0
+        BRANCH32(be, pt, 8b)
+         add    %o0, 4, %o0
+
+        /* Check every byte. */
+        srl     %o5, 24, %g7
+        andcc   %g7, 0xff, %g0
+        BRANCH32(be, pn, 1f)
+         add    %o0, -4, %o4
+        srl     %o5, 16, %g7
+        andcc   %g7, 0xff, %g0
+        BRANCH32(be, pn, 1f)
+         add    %o4, 1, %o4
+        srl     %o5, 8, %g7
+        andcc   %g7, 0xff, %g0
+        BRANCH32(be, pn, 1f)
+         add    %o4, 1, %o4
+        andcc   %o5, 0xff, %g0
+        BRANCH32_ANNUL(bne, pt, 2b)
+         ld     [%o0], %o5
+        add     %o4, 1, %o4
+1:
+        retl
+         sub    %o4, %o1, %o0
+11:
+        retl
+         mov    0, %o0
+12:
+        retl
+         mov    1, %o0
+13:
+        retl
+         mov    2, %o0
+ENDPROC(strlen)