1 files changed, 35 insertions, 0 deletions
diff --git a/newlib/libc/machine/m68k/strlen.c b/newlib/libc/machine/m68k/strlen.c
new file mode 100644
index 00000000000..589a697517b
--- /dev/null
+++ b/newlib/libc/machine/m68k/strlen.c
@@ -0,0 +1,35 @@
+/*
+ *  C library strlen routine
+ *
+ *  This routine has been optimized for the CPU32+.
+ *  It should run on all 68k machines.
+ *
+ *  W. Eric Norum
+ *  Saskatchewan Accelerator Laboratory
+ *  University of Saskatchewan
+ *  Saskatoon, Saskatchewan, CANADA
+ *  eric@skatter.usask.ca
+ */
+
+#include <string.h>
+
+/*
+ * Test bytes using CPU32+ loop mode if possible.
+ */
+size_t
+strlen (const char *str)
+{
+	unsigned int n = ~0;
+	const char *cp = str;
+
+	asm volatile ("1:\n"
+	     "\ttst.b (%0)+\n"
+#if defined(__mcpu32__)
+	     "\tdbeq %1,1b\n"
+#endif
+	     "\tbne.b 1b\n" :
+		"=a" (cp), "=d" (n) :
+		 "0" (cp),  "1" (n) :
+		 "cc");
+	return (cp - str) - 1;
+}