* File name: ir/ir/iropt.h
* Purpose: iropt --- optimizations of an ir node.
* Author: Martin Trapp, Christian Schaefer
- * Modified by: Goetz Lindenmaier
+ * Modified by: Goetz Lindenmaier, Michael Beck
* Created:
* CVS-ID: $Id$
* Copyright: (c) 1998-2003 Universität Karlsruhe
*/
/**
-* @file iropt.h
-*
-* Declarations for optimizations of an ir node.
-*
-* @author Martin Trapp, Christian Schaefer
-*/
+ * @file iropt.h
+ *
+ * Declarations for optimizations of an ir node.
+ *
+ * @author Martin Trapp, Christian Schaefer
+ */
+#ifndef _FIRM_IR_IROPT_H_
+#define _FIRM_IR_IROPT_H_
+#include "firm_types.h"
-# ifndef _IROPT_H_
-# define _IROPT_H_
+/**
+ * The Floating point model.
+ *
+ * Several basic properties are defined:
+ * - fp_explicit_rounding
+ * - fp_strict_algebraic
+ * - fp_contradictions
+ * - fp_strict_eval_order
+ * - fp_exceptions
+ * - fp_environment_access
+ *
+ * From those basic properties three general models are defined,
+ * compatible to the VC8 compiler:
+ * - fp_model_precise:
+ * Default mode. Associative and distributive law forbidden unless a transformation
+ * is guaranteed to produce the same result.
+ * No FPU environment access. No FP exception semantics.
+ * - fp_model_strict:
+ * Slowest mode. Additionally to fp_model_precise allows correct handling of
+ * FP exceptions and FPU environment access.
+ * - fp_model_fast:
+ * Fastest mode. Associative and distributive law allowed at the expense
+ * of floating point accuracy and correctness. Explicit rounding is disabled.
+ */
+typedef enum _fp_model_t {
+ fp_explicit_rounding = 1, /**< Explicit rounding at assignments, typecasts, return
+ and function calls. Conv nodes may NOT be removed, even
+ if they look useless. */
+ fp_strict_algebraic = 2, /**< Strict adherence to non-associative and non-distributive
+ algebra unless the same result is guaranteed. */
+ fp_contradictions = 4, /**< FP contradictions are enabled. Only for backend. */
+ fp_strict_eval_order = 8, /**< FP instructions must be strict evaluated in given order. */
+ fp_exceptions = 16, /**< FP exceptions are supported. No reordering that changes
+ the exception flow are allowed. Backends must generate
+ synchronized exception code. */
+ fp_environment_access = 32, /**< FPU environment can be accessed. Even Constant folding
+ cannot be done. */
-# include "irnode.h"
-# include "irgraph.h"
-# include "irflag.h"
+ /** Precise floating point model. Default. */
+ fp_model_precise = fp_explicit_rounding|fp_strict_algebraic|fp_contradictions,
+ /** Strict floating point model. */
+ fp_model_strict = fp_explicit_rounding|fp_strict_algebraic|fp_strict_eval_order|
+ fp_exceptions|fp_environment_access,
+ /** Fast floating point model. */
+ fp_model_fast = fp_contradictions,
+} fp_model_t;
/** If the expression referenced can be evaluated statically
* computed_value returns a tarval representing the result.
* Else returns tarval_bad. */
-tarval *computed_value (ir_node*);
+tarval *computed_value(ir_node *n);
/** Applies all optimizations to n that are expressible as a pattern
* in Firm, i.e., they need not a walk of the graph.
* An equivalent optimization is applied in the constructors defined in
* ircons.ch. There n is freed if a better node could be found.
*/
-ir_node *optimize_in_place (ir_node*);
-
-/**
- * set the default ir op operations
- */
-ir_op *firm_set_default_operations(ir_op*);
+ir_node *optimize_in_place(ir_node *n);
-# endif /* _IROPT_H_ */
+#endif /* _FIRM_IR_IROPT_H_ */