X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fir%2Firarch.h;h=65b129b48eccbf90b8920392ca5b5c9170b50906;hb=ecf4d3aa8c62642835511e1f7b8a329078161fe1;hp=4aee97b8286a9c35a418b744eaaea92d2134294f;hpb=909c2e6d7426096e0e4df2371fbec7a06d4553ef;p=libfirm

diff --git a/ir/ir/irarch.h b/ir/ir/irarch.h
index 4aee97b82..65b129b48 100644
--- a/ir/ir/irarch.h
+++ b/ir/ir/irarch.h
@@ -7,8 +7,8 @@
  * $Id$
  */
 
-#ifndef __FIRM_IRARCH_H
-#define __FIRM_IRARCH_H
+#ifndef _FIRM_IRARCH_H
+#define _FIRM_IRARCH_H
 
 #include "irnode.h"
 
@@ -17,16 +17,18 @@
  * optimizations.
  */
 typedef struct {
-  int also_use_subs : 1; /**< Use also Subs when resolving muls to shifts */
-  int allow_mulhs   : 1; /**< Use the Mulhs operation for division by constant */
-  int allow_mulhu   : 1; /**< Use the Mulhu operation for division by constant */
+  /* Mul optimization */
+  int also_use_subs : 1;                /**< Use also Subs when resolving Muls to shifts */
+  int maximum_shifts;                   /**< The maximum number of shifts that shall be inserted for a mul. */
+  unsigned highest_shift_amount;        /**< The highest shift amount you want to
+			                     tolerate. Muls which would require a higher
+			                     shift constant are left. */
 
-  int maximum_shifts;    /**< The maximum number of shifts that shall be
-			    inserted for a mul. */
-
-  int highest_shift_amount; /**< The highest shift amount you want to
-			       tolerate. Muls which would require a higher
-			       shift constant are left. */
+  /* Div/Mod optimization */
+  int allow_mulhs   : 1;        /**< Use the Mulhs operation for division by constant */
+  int allow_mulhu   : 1;        /**< Use the Mulhu operation for division by constant */
+  int max_bits_for_mulh;        /**< Maximum number of bits the Mulh operation can take.
+                                     Modes with higher amount of bits will use Mulh */
 } arch_dep_params_t;
 
 /**
@@ -47,7 +49,7 @@ typedef enum {
   arch_dep_none         = 0,
   arch_dep_mul_to_shift = 1,	/**< optimize Mul into Shift/Add/Sub */
   arch_dep_div_by_const = 2,	/**< optimize Div into Shift/Add/Mulh */
-  arch_dep_mod_by_const = 4	/**< optimize Mod into Shift/Add/Mulh */
+  arch_dep_mod_by_const = 4	    /**< optimize Mod into Shift/Add/Mulh */
 } arch_dep_opts_t;
 
 /**
@@ -72,10 +74,10 @@ void arch_dep_set_opts(arch_dep_opts_t opts);
  * - maximum_shifts
  * - highest_shift_amount
  *
- * If irn is a Mul with a Const, The constant is inspected, if it meets the
+ * If irn is a Mul with a Const, the constant is inspected if it meets the
  * requirements of the three variables stated above. If a Shl/Add/Sub
- * sequence can be generated, that meets these requirements, this expression
- * is returned. In each other case, irn is returned unmodified.
+ * sequence can be generated that meets these requirements, this expression
+ * is returned. In each other case irn is returned unmodified.
  *
  * @param irn       The Firm node to inspect.
  * @return          A replacement expression for irn.
@@ -87,11 +89,12 @@ ir_node *arch_dep_replace_mul_with_shifts(ir_node *irn);
  * This function is driven by the 3 parameters:
  * - allow_mulhu
  * - allow_mulhs
+ * - max_bits_for_mulh
  *
- * If irn is a Div with a Const, The constant is inspected, if it meets the
+ * If irn is a Div with a Const, the constant is inspected if it meets the
  * requirements of the variables stated above. If a Shl/Add/Sub/Mulh
- * sequence can be generated, that meets these requirements, this expression
- * is returned. In each other case, irn is returned unmodified.
+ * sequence can be generated that meets these requirements, this expression
+ * is returned. In each other case irn is returned unmodified.
  *
  * @param irn       The Firm node to inspect.
  * @return          A replacement expression for irn.
@@ -103,11 +106,12 @@ ir_node *arch_dep_replace_div_by_const(ir_node *irn);
  * This function is driven by the 3 parameters:
  * - allow_mulhu
  * - allow_mulhs
+ * - max_bits_for_mulh
  *
- * If irn is a Mod with a Const, The constant is inspected, if it meets the
+ * If irn is a Mod with a Const, the constant is inspected if it meets the
  * requirements of the variables stated above. If a Shl/Add/Sub/Mulh
- * sequence can be generated, that meets these requirements, this expression
- * is returned. In each other case, irn is returned unmodified.
+ * sequence can be generated that meets these requirements, this expression
+ * is returned. In each other case irn is returned unmodified.
  *
  * @param irn       The Firm node to inspect.
  * @return          A replacement expression for irn.
@@ -119,11 +123,12 @@ ir_node *arch_dep_replace_mod_by_const(ir_node *irn);
  * This function is driven by the 3 parameters:
  * - allow_mulhu
  * - allow_mulhs
+ * - max_bits_for_mulh
  *
- * If irn is a DivMod with a Const, The constant is inspected, if it meets the
+ * If irn is a DivMod with a Const, the constant is inspected if it meets the
  * requirements of the variables stated above. If a Shl/Add/Sub/Mulh
- * sequence can be generated, that meets these requirements, this expression
- * is returned. In each other case, irn is returned unmodified.
+ * sequence can be generated that meets these requirements, this expression
+ * is returned. In each other case irn is returned unmodified.
  *
  * @param div       After call contains the Firm node div result or NULL.
  * @param mod       After call contains the Firm node mod result or NULL.
@@ -131,4 +136,4 @@ ir_node *arch_dep_replace_mod_by_const(ir_node *irn);
  */
 void arch_dep_replace_divmod_by_const(ir_node **div, ir_node **mod, ir_node *irn);
 
-#endif
+#endif /* _FIRM_IRARCH_H */