3 * File name: ir/ir/irflag.h
4 * Purpose: Flags to control optimizations.
5 * Author: Christian Schaefer, Goetz Lindenmaier
9 * Copyright: (c) 1999-2003 Universität Karlsruhe
10 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
18 * @author Christian Schaefer
25 * A container type to load/restore all optimizations
27 typedef unsigned optimization_state_t;
30 * This function enables/disables optimizations globally.
32 * If optimize == 0 no optimizations are performed at all.
33 * Default: optimize == 1.
35 void set_optimize (int value);
36 int get_optimize(void);
38 /** Enables/Disables constant folding optimization.
40 * If opt_constant_folding == 1 perform
41 * - constant expression evaluation (2 + 5 ==> 7, 3 < 2 ==> false)
42 * - algebraic simplification (a * 0 ==> 0, a or a ==> a)
43 * - simplification of tests ( !(a < b) ==> (a >= b))
44 * - refining the memory representation
45 * - remove store after load
46 * Default: opt_constant_folding == 1.
48 void set_opt_constant_folding (int value);
50 /** Enables/Disables constant subexpression elimination.
52 * If opt_cse == 1 perform constant subexpression elimination.
53 * Default: opt_cse == 1.
55 void set_opt_cse (int value);
57 /** Enables/Disables global constant subexpression elimination.
59 * If opt_global_cse == 1 and opt_cse == 1 perform intra procedure
60 * constant subexpression elimination for floating nodes. Intra
61 * procedure cse gets the graph into state "floating". It is necessary
62 * to run pre/code motion to get the graph back into state "pinned".
63 * right after a call to local_optimize with global cse turned on.
64 * Default: opt_global_cse == 0.
66 void set_opt_global_cse (int value);
68 /** Enables/Disables unreachable code elimination.
70 * If opt_unreachable_code == 1 replace nodes (except Block,
71 * Phi and Tuple) with a Bad predecessor by the Bad node.
72 * Default: opt_unreachable_code == 1.
74 void set_opt_unreachable_code(int value);
76 /** Enables/Disables control flow optimizations.
78 * Performs Straightening, if simplifications and loop simplifications.
79 * Sets all separate control flow flags (control_flow_straightening,
80 * weak_simplification, strong_simplification and critical_edges).
82 void set_opt_control_flow(int value);
84 /** Enables/Disables Straightening. */
85 void set_opt_control_flow_straightening(int value);
87 /** Enables/Disables if simplifications in local optimizations. */
88 void set_opt_control_flow_weak_simplification(int value);
90 /** Enables/Disables strong if and loop simplification (in optimize_cf). */
91 void set_opt_control_flow_strong_simplification(int value);
93 /** Enables/Disables removal of critical control flow edges. */
94 void set_opt_critical_edges(int value);
96 /** Enables/Disables reassociation.
98 * If opt_reassociation == 1 reassociation is performed.
99 * Default: opt_reassociation == 1.
101 void set_opt_reassociation(int value);
103 /** Enables/Disables dead node elimination.
105 * If opt_dead_node_elimination == 1 deallocate all dead nodes
106 * by copying the firm graph.
107 * Default: opt_dead_node_elimination == 1. */
108 void set_opt_dead_node_elimination (int value);
110 /** Enables/Disables dead method elimination.
112 * If opt_dead_node_elimination == 1 methods never called are
114 * Default: opt_dead_node_elimination == 1. */
115 void set_opt_dead_method_elimination (int value);
116 void set_opt_dead_method_elimination_verbose (int value);
118 /** Enable/Disables inlining.
120 * If opt_inline == 1 the inlining transformation is performed.
122 void set_opt_inline (int value);
124 /** Enable/Disable optimization of dynamic method dispatch
126 * This flag enables/disables the optimization of dynamic method dispatch.
127 * If the flag is turned on Sel nodes can be replaced by Const nodes representing
128 * the address of a function.
130 void set_opt_dyn_meth_dispatch (int value);
132 /** Enable/Disable normalizations of the firm representation.
134 * This flag guards transformations that normalize the firm representation
135 * as removing Ids and Tuples, useless Phis, replacing SymConst(id) by
136 * Const(entity) and others.
137 * The transformations guarded by this flag are not guarded by flag
139 * Many algorithms operating on firm can not deal with constructs in
140 * the non-normalized representation.
142 * @@@ ATTENTION: not all such transformations are guarded by a flag.
144 void set_opt_normalize (int value);
146 /** Enable/Disable optimization of tail-recursion calls.
148 * This flag enables/disables the optimization tail-recursion call.
149 * If the flag is turned on tail-recursion calls are optimized into loops.
151 void set_opt_tail_recursion(int value);
154 * Save the current optimization state.
156 void save_optimization_state(optimization_state_t *state);
159 * Restore the current optimization state.
161 void restore_optimization_state(const optimization_state_t *state);