initial upload

src/bigmath/chain/util.cpp

@@ -0,0 +1,18 @@
+#include "util.hpp"
+
+namespace bigmath {
+
+    u64 ipow(u64 b, u64 p) {
+        // FROM stack overflow
+        // "The most efficient way to implement [int pow]"
+        u64 r = 1;
+        for(;;) {
+            if(p & 1) r *= b;
+            p >>= 1;
+            if(!p) break;
+            b *= b;
+        }
+        return r;
+    }
+
+}