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diff --git a/gui/util.h b/gui/util.h
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+/**
+ * Given `total_levels', returns an integer between 4 and 12 which is a linear map of `level' onto `total_levels'.
+ * This is used for generating cache sizes given a number of levels.
+ * @param the total number of cache levels, zero-indexed.
+ * @param a numberedcache level, zero-indexed.
+ * @return an integer between 4-12, linearly scaled with level.
+ */
+int cache_size_mapper(int total_levels, int level);