README and better automated build

Author: nanoant

.gitignore

@@ -0,0 +1,2 @@
+*.o
+*flops

Makefile

@@ -1,9 +1,12 @@
 CPPFLAGS += -fopenmp -O3 -g -march=native
 
-all: avxflops sseflops
+all: sseflops avxflops
+
+sseflops: sseflops.o
+	$(CXX) -o $@ $< $(CXXFLAGS) $(CPPFLAGS) $(LDFLAGS)
 
 avxflops: avxflops.o
-	$(CXX) -o $@ $< $(CPPFLAGS) $(LDFLAGS)
+	$(CXX) -o $@ $< $(CXXFLAGS) $(CPPFLAGS) $(LDFLAGS)
 
-sseflops: sseflops.o
-	$(CXX) -o $@ $< $(CPPFLAGS) $(LDFLAGS)
+clean:
+	rm -f *.o

README.md

@@ -0,0 +1,9 @@
+FLOPs
+=====
+
+This is project for awesome code of [Mystical](http://stackoverflow.com/users/922184/mysticial) available at ["how to achieve 4 flops per cycle"](http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle/8391601#8391601).
+
+Usage
+-----
+
+Just `make` then run. If you do not have min. *Sandy Bridge / AVX* CPU `avxflops` build will fail, but you can still test with `sseflops`.

avxflops.cc

@@ -1,8 +1,6 @@
 // x86 AVX FLOPs counter
 // Based on:
 //   http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle
-// Build with:
-//   g++ -O3 -fopenmp -march=native -o avxflops avxflops.cc
 
 #include <stdint.h>
 #include <iostream>

sseflops.cc

@@ -1,8 +1,6 @@
 // x86 SSE FLOPs counter
 // Based on:
 //   http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle
-// Build with:
-//   g++ -O3 -fopenmp -march=native -o sseflops sseflops.cc
 
 #include <stdint.h>
 #include <iostream>