1 files changed, 73 insertions, 0 deletions
diff --git a/memset.c b/memset.c
new file mode 100644
index 0000000..5f93dc3
--- /dev/null
+++ b/memset.c
@@ -0,0 +1,73 @@
+void *memset(void *optr, int ival, unsigned long size)
+{
+  unsigned long val = ival;
+  void *ptr = optr;
+
+  if (__builtin_expect (size == 0, 0))
+    return;
+
+  if (__builtin_expect (val != 0, 0))
+    {
+      val = val & 0xff;
+      val |= val << 8;
+      val |= val << 16;
+      val |= val << 32;
+    }
+
+  if (__builtin_expect ((unsigned long)ptr & 1, 0))
+    {
+      *(char *)ptr = val;
+      ptr += 1;
+      size -= 1;
+    }
+
+  if (__builtin_expect ((unsigned long)ptr & 2, 0))
+    {
+      if (size < 2)
+	goto tail_1;
+      *(short *)ptr = val;
+      ptr += 2;
+      size -= 2;
+    }
+
+  if (__builtin_expect ((unsigned long)ptr & 4, 0))
+    {
+      if (size < 4)
+	goto tail_3;
+      *(int *)ptr = val;
+      ptr += 4;
+      size -= 4;
+    }
+  
+  while (size >= 8)
+    {
+      *(long *)ptr = val;
+      ptr += 8;
+      size -= 8;
+    }
+
+  if (size >= 4)
+    {
+      *(int *)ptr = val;
+      ptr += 4;
+      size -= 4;
+    }
+
+ tail_3:
+  if (size >= 2)
+    {
+      *(short *)ptr = val;
+      ptr += 2;
+      size -= 2;
+    }
+
+ tail_1:
+  if (size > 0)
+    {
+      *(char *)ptr = val;
+      ptr += 1;
+      size -= 1;
+    }
+
+  return optr;
+}