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jeremybenn |
/* Scalar evolution detector.
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Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
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Free Software Foundation, Inc.
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Contributed by Sebastian Pop <s.pop@laposte.net>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_TREE_SCALAR_EVOLUTION_H
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#define GCC_TREE_SCALAR_EVOLUTION_H
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extern tree number_of_latch_executions (struct loop *);
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extern tree number_of_exit_cond_executions (struct loop *);
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extern gimple get_loop_exit_condition (const struct loop *);
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extern void scev_initialize (void);
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extern void scev_reset (void);
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extern void scev_reset_htab (void);
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extern void scev_finalize (void);
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extern tree analyze_scalar_evolution (struct loop *, tree);
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extern tree instantiate_scev (basic_block, struct loop *, tree);
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extern tree resolve_mixers (struct loop *, tree);
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extern void gather_stats_on_scev_database (void);
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extern void scev_analysis (void);
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extern unsigned int scev_const_prop (void);
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extern bool expression_expensive_p (tree);
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extern bool simple_iv (struct loop *, struct loop *, tree, affine_iv *, bool);
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extern tree compute_overall_effect_of_inner_loop (struct loop *, tree);
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/* Returns the basic block preceding LOOP or ENTRY_BLOCK_PTR when the
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loop is function's body. */
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static inline basic_block
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block_before_loop (loop_p loop)
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{
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edge preheader = loop_preheader_edge (loop);
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return (preheader ? preheader->src : ENTRY_BLOCK_PTR);
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}
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/* Analyze all the parameters of the chrec that were left under a
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symbolic form. LOOP is the loop in which symbolic names have to
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be analyzed and instantiated. */
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static inline tree
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instantiate_parameters (struct loop *loop, tree chrec)
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{
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return instantiate_scev (block_before_loop (loop), loop, chrec);
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}
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/* Returns the loop of the polynomial chrec CHREC. */
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static inline struct loop *
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get_chrec_loop (const_tree chrec)
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{
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return get_loop (CHREC_VARIABLE (chrec));
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}
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#endif /* GCC_TREE_SCALAR_EVOLUTION_H */
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