- BugFix: kill partitions with 0 blocks either

[libfirm] / include / libfirm / irmode.h

diff --git a/include/libfirm/irmode.h b/include/libfirm/irmode.h
index bd55628..a5932a0 100644 (file)
--- a/include/libfirm/irmode.h
+++ b/include/libfirm/irmode.h
@@ -43,7 +43,7 @@
 /**
  * Predefined mode according to tech report 1999-14.
  */
-typedef enum { /* irm is short for `ir mode' */
+typedef enum ir_modecode { /* irm is short for `ir mode' */
        irm_BB,                       /**< basic block */
        irm_X,                        /**< execution */
        irm_F,                        /**< float(32) */
@@ -68,28 +68,45 @@ typedef enum { /* irm is short for `ir mode' */
        irm_max                       /**< maximum value for ir_modecode */
 } ir_modecode;
 
-/** These values represent the different mode classes of value representations.
+/** Helper values for ir_mode_sort. */
+enum ir_mode_sort_helper {
+       irmsh_is_num   = 0x10, /**< mode represents a number */
+       irmsh_is_data  = 0x20, /**< mode represents data (can be carried in registers) */
+       irmsh_is_datab = 0x40, /**< mode represents data or is internal boolean */
+       irmsh_is_dataM = 0x80, /**< mode represents data or is memory */
+};
+
+/**
+ * These values represent the different mode classes of value representations.
+ * Beware: do not change the order of these values without checking
+ * the mode_is
  */
-typedef enum {
+typedef enum ir_mode_sort {
        /* Predefined sorts of modes */
-       irms_auxiliary,         /**< Only for Firm use. Not extensible. (irm_T) */
-       irms_control_flow,      /**< Marks all control flow modes. Not extensible. (irm_BB, irm_X) */
-       irms_memory,            /**< Marks the memory mode.  Not extensible. (irm_M) */
-       irms_internal_boolean,  /**< Internal boolean representation.
-                                    Storing to memory impossible, convert first. (irm_b) */
+       irms_auxiliary        = 0, /**< Only for Firm use. Not extensible. (irm_T) */
+       irms_control_flow     = 1, /**< Marks all control flow modes. Not extensible. (irm_BB, irm_X) */
+       irms_memory           = 2 | irmsh_is_dataM, /**< Marks the memory mode.  Not extensible. (irm_M) */
+
+       /** Internal boolean representation.
+            Storing to memory impossible, convert first. (irm_b) */
+       irms_internal_boolean = 3 | irmsh_is_datab,
+
        /* user-extensible sorts of modes */
-       irms_int_number,        /**< A mode to represent int numbers.
-                                    Integer computations can be performed. */
-       irms_float_number,      /**< A mode to represent float numbers.
-                                    Floating point computations can be performed. */
-       irms_reference,         /**< A mode to represent entities.
-                                    Restricted int computations can be performed */
+       /** A mode to represent entities.
+           Restricted int computations can be performed */
+       irms_reference        = 4 | irmsh_is_data | irmsh_is_datab | irmsh_is_dataM,
+       /** A mode to represent int numbers.
+           Integer computations can be performed. */
+       irms_int_number       = 5 | irmsh_is_data | irmsh_is_datab | irmsh_is_dataM | irmsh_is_num,
+       /** A mode to represent float numbers.
+           Floating point computations can be performed. */
+       irms_float_number     = 6 | irmsh_is_data | irmsh_is_datab | irmsh_is_dataM | irmsh_is_num,
 } ir_mode_sort;
 
 /** These values represent the different arithmetic operations possible with a mode.
     Further arithmetics can be defined, e.g., for @@@ modes.
  */
-typedef enum {
+typedef enum ir_mode_arithmetic {
        irma_uninitialized = 0,
        irma_none = 1,              /**< For modes for which no representation is specified.
                                         These are modes of sort auxiliary, internal_boolean and character. */
@@ -363,6 +380,7 @@ void set_modeP_code(ir_mode *p);
  */
 void set_modeP_data(ir_mode *p);
 
+/*@{*/
 /**
    Functions to check, whether a ir_modecode is signed, float, int, character,
    reference, num, data, datab or dataM.
@@ -393,7 +411,6 @@ void set_modeP_data(ir_mode *p);
 
    Vector "int" and "float" are defined by the arithmetic and vector_elem > 1.
 */
-/*@}*/
 /* Test for a certain class of modes. */
 int mode_is_signed (const ir_mode *mode);
 int mode_is_float (const ir_mode *mode);
@@ -405,11 +422,28 @@ int mode_is_datab (const ir_mode *mode);
 int mode_is_dataM (const ir_mode *mode);
 int mode_is_float_vector (const ir_mode *mode);
 int mode_is_int_vector (const ir_mode *mode);
+/*@}*/
 
-/** Returns true if sm can be converted to lm without loss
-   according to firm definition */
+/**
+ * Returns true if sm can be converted to lm without loss
+ * according to firm definition.
+ *
+ * Note that mode_Iu is NOT smaller than mode_Is here.
+ *
+ * @see values_in_mode()
+ */
 int smaller_mode(const ir_mode *sm, const ir_mode *lm);
 
+/**
+ * Returns true if a value of mode sm can be converted into mode lm
+ * and backwards without loss.
+ *
+ * Note that mode_Iu values CAN be converted in mode_Is and back.
+ *
+ * @see smaller_mode()
+ */
+int values_in_mode(const ir_mode *sm, const ir_mode *lm);
+
 /**
  * Returns a matching unsigned mode for a given integer signed mode.
  * Returns NULL if no matching mode exists.
@@ -467,4 +501,11 @@ ir_mode *get_reference_mode_unsigned_eq(ir_mode *mode);
  */
 void set_reference_mode_unsigned_eq(ir_mode *ref_mode, ir_mode *int_mode);
 
+/**
+ * Returns non-zero if the cast from mode src to mode dst is a
+ * reinterpret cast (ie. only the bit pattern is reinterpreted,
+ * no conversion is done)
+ */
+int is_reinterpret_cast(const ir_mode *src, const ir_mode *dst);
+
 #endif