X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=include%2Flibfirm%2Firoptimize.h;h=f31ea06f09c39c017ac5b8c81fa03e8a818bab1b;hb=e302589b2ee3b43584b856431b581d67bc679a68;hp=fcf8aa3b1fa979383576ae3ad61b7f8ab97de438;hpb=a2b3a133cc8333c011581a8b03d65316c2c631a4;p=libfirm

diff --git a/include/libfirm/iroptimize.h b/include/libfirm/iroptimize.h
index fcf8aa3b1..f31ea06f0 100644
--- 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.
  *