Added support of IBM's MASS library that optimizes performance on Power architectures

Makefile.power

@@ -38,6 +38,16 @@ else
 endif
 endif
 
+#Either uncomment below line or run make with `USE_MASS=1` to enable support of MASS library
+#USE_MASS = 1
+
+ifeq ($(USE_MASS), 1)
+# Path to MASS libs, change it if the libs are installed at any other location
+MASSPATH        = /opt/ibm/xlmass/8.1.3/lib
+COMMON_OPT     += -mveclibabi=mass -ftree-vectorize -funsafe-math-optimizations -DUSE_MASS
+EXTRALIB       += -L$(MASSPATH) -lmass -lmassvp8 -lmass_simdp8
+endif
+
 ifdef BINARY64
 
 

README.md

@@ -43,6 +43,35 @@ On X86 box, compile this library for loongson3a CPU with loongcc (based on Open6
 
     make DEBUG=1
 
+### Compile with MASS Support on Power CPU (Optional dependency)
+
+[IBM MASS](http://www-01.ibm.com/software/awdtools/mass/linux/mass-linux.html) library consists of a set of mathematical functions for C, C++, and
+Fortran-language applications that are tuned for optimum performance on POWER architectures. OpenBLAS with MASS requires 64-bit, little-endian OS on POWER.
+The library can be installed as below -
+
+ * On Ubuntu:
+
+    wget -q http://public.dhe.ibm.com/software/server/POWER/Linux/xl-compiler/eval/ppc64le/ubuntu/public.gpg -O- | sudo apt-key add -
+    echo "deb http://public.dhe.ibm.com/software/server/POWER/Linux/xl-compiler/eval/ppc64le/ubuntu/ trusty main" | sudo tee /etc/apt/sources.list.d/ibm-xl-compiler-eval.list
+    sudo apt-get update
+    sudo apt-get install libxlmass-devel.8.1.3
+
+ * On RHEL/CentOS:
+
+    wget http://public.dhe.ibm.com/software/server/POWER/Linux/xl-compiler/eval/ppc64le/rhel7/repodata/repomd.xml.key
+    sudo rpm --import repomd.xml.key
+    wget http://public.dhe.ibm.com/software/server/POWER/Linux/xl-compiler/eval/ppc64le/rhel7/ibm-xl-compiler-eval.repo
+    sudo cp ibm-xl-compiler-eval.repo /etc/yum.repos.d/
+    sudo yum install libxlmass-devel.8.1.3
+
+After installing MASS library, compile openblas with USE_MASS=1.
+
+Example:
+
+Compiling on Power8 with MASS support -
+
+    make USE_MASS=1 TARGET=POWER8
+
 ### Install to the directory (optional)
 
 Example: