1 files changed, 32 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/alpha/strlen.c b/mdk-stage1/dietlibc/alpha/strlen.c
new file mode 100644
index 000000000..ac532254a
--- /dev/null
+++ b/mdk-stage1/dietlibc/alpha/strlen.c
@@ -0,0 +1,32 @@
+#include <string.h>
+
+static const unsigned long long magic = 0x0101010101010101LL;
+
+size_t strlen(const char *s)
+{
+  const char *t = s;
+  unsigned long long word;
+
+  if (!s) return 0;
+
+  /* Byte compare up until 64 bit word boundary */
+  for (; ((unsigned long long) t & 7); t++)
+    if (!*t) return t - s;
+
+  /* Word compare */
+  do {
+    word = *((unsigned long long *) t); t += 8;
+    word = (word - magic) &~ word;
+    word &= (magic << 7);
+  } while (word == 0);
+
+  /* word & 0x8080808080808080 == word */
+  word = (word - 1) & (magic << 8);
+  word += (word << 32);
+  word += (word << 16);
+  word += (word << 8);
+  t += word >> 56;
+  return ((const char *) t) - 8 - s;
+}
+
+