add compile-time variable bit length

2 files changed, 9 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index 221f015..e6660ee 100644
--- a/Makefile
+++ b/Makefile
@@ -2,5 +2,8 @@ CXX=g++ -std=c++0x -O3 -Wall -Wextra -Werror -lpthread
 
 all: cacount
 
+cacount_%: cacount.cpp
+	$(CXX) -DBIT_WIDTH=$(shell echo $@ | egrep -o '[^_]*$$') -fwhole-program $< -o $@
+
 clean:
-	-rm cacount *~
\ No newline at end of file
+	-rm cacount *~
diff --git a/cacount.cpp b/cacount.cpp
index 07863ca..26b2069 100644
--- a/cacount.cpp
+++ b/cacount.cpp
@@ -15,8 +15,12 @@
 
 using namespace std;
 
+#ifndef BIT_WIDTH
+#define BIT_WIDTH 31
+#endif
+
 typedef uint32_t State;
-const State logState = 31;
+const State logState = BIT_WIDTH;
 const State maxState = 1 << logState;
 
 bitset<8> rule(110);