add list_head typedef

[libfirm] / include / libfirm / iroptimize.h

diff --git a/include/libfirm/iroptimize.h b/include/libfirm/iroptimize.h
index fcf8aa3..f31ea06 100644 (file)
--- a/include/libfirm/iroptimize.h
+++ b/include/libfirm/iroptimize.h
@@ -251,7 +251,9 @@ typedef enum osr_flags {
        osr_flag_none               = 0,  /**< no additional flags */
        osr_flag_lftr_with_ov_check = 1,  /**< do linear function test replacement
                                               only if no overflow can occur. */
-       osr_flag_ignore_x86_shift   = 2   /**< ignore Multiplications by 2, 4, 8 */
+       osr_flag_ignore_x86_shift   = 2,  /**< ignore Multiplications by 2, 4, 8 */
+       osr_flag_keep_reg_pressure  = 4   /**< do NOT increase register pressure by introducing new
+                                              induction variables. */
 } osr_flags;
 
 /* FirmJNI cannot handle identical enum values... */
@@ -422,8 +424,14 @@ void scalar_replacement_opt(ir_graph *irg);
 void reduce_strength(ir_graph *irg);
 
 /**
- * Optimizes simple tail-recursion calls by
- * converting them into loops. Depends on the flag opt_tail_recursion.
+ * Optimizes tail-recursion calls by converting them into loops.
+ * Depends on the flag opt_tail_recursion.
+ * Currently supports the following forms:
+ *  - return func();
+ *  - return x + func();
+ *  - return func() - x;
+ *  - return x * func();
+ *  - return -func();
  *
  * Does not work for Calls that use the exception stuff.
  *