mem: Add zero detect memory functions

This patch introduces the base, avx and sse optimized zero detect memory function.
The zero detect memory function tests if a memory region is all zeroes. If all the
bytes in the memory region are zero, the function return a zero. Otherwise, if the
memory region has non zero bytes, the zero detect function returns a 1.

Change-Id: If965badf750377124d0067d09f888d0419554998
Signed-off-by: John Kariuki <John.K.Kariuki@intel.com>

include/mem_routines.h

@@ -0,0 +1,64 @@
+/**********************************************************************
+  Copyright(c) 2011-2018 Intel Corporation All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in
+      the documentation and/or other materials provided with the
+      distribution.
+    * Neither the name of Intel Corporation nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+**********************************************************************/
+
+#include <stddef.h>
+
+/**
+ *  @file mem_routines.h
+ *  @brief Interface to storage mem operations
+ *
+ *  Defines the interface for vector versions of common memory functions.
+ */
+
+
+#ifndef _MEM_ROUTINES_H_
+#define _MEM_ROUTINES_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Detect if a memory region is all zero
+ *
+ * Zero detect function with optimizations for large blocks > 128 bytes
+ *
+ * @param    mem   Pointer to memory region to test
+ * @param    len   Length of region in bytes
+ * @returns  0     - region is all zeros
+ *           other - region has non zero bytes
+ */
+int isal_zero_detect(void *mem, size_t len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // _MEM_ROUTINES_H_
+