Turn on -O2

Makefile

@@ -25,7 +25,7 @@ CXX ?= g++
 
 WORDS = 24
 
-CXXFLAGS=-g -Wall -O0
+CXXFLAGS=-g -Wall -O2
 CPPFLAGS=-DWORDS=$(WORDS) -I$(LIBEVENT)/include -I$(GMP)/include -UVERBOSE
 NVCCOPTS=-g -arch sm_20 --ptxas-options=-v -O2
 NVCC=nvcc $(NVCCOPTS)