+histogram_value gimple_histogram_value (struct function *, tree);
+histogram_value gimple_histogram_value_of_type (struct function *, tree, enum hist_type);
+void gimple_add_histogram_value (struct function *, tree, histogram_value);
+void gimple_remove_histogram_value (struct function *, tree, histogram_value);
+void dump_histograms_for_stmt (struct function *, FILE *, tree);
+void gimple_remove_histogram_value (struct function *, tree, histogram_value);
+void gimple_remove_stmt_histograms (struct function *, tree);
+void gimple_duplicate_stmt_histograms (struct function *, tree, struct function *, tree);
+void verify_histograms (void);
+void free_histograms (void);
+void stringop_block_profile (tree, unsigned int *, HOST_WIDE_INT *);
+