1 /* Scalar evolution detector. 2 Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010 3 Free Software Foundation, Inc. 4 Contributed by Sebastian Pop <s.pop@laposte.net> 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free 10 Software Foundation; either version 3, or (at your option) any later 11 version. 12 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GCC; see the file COPYING3. If not see 20 <http://www.gnu.org/licenses/>. */ 21 22 #ifndef GCC_TREE_SCALAR_EVOLUTION_H 23 #define GCC_TREE_SCALAR_EVOLUTION_H 24 25 extern tree number_of_latch_executions (struct loop *); 26 extern tree number_of_exit_cond_executions (struct loop *); 27 extern gimple get_loop_exit_condition (const struct loop *); 28 29 extern void scev_initialize (void); 30 extern void scev_reset (void); 31 extern void scev_reset_htab (void); 32 extern void scev_finalize (void); 33 extern tree analyze_scalar_evolution (struct loop *, tree); 34 extern tree instantiate_scev (basic_block, struct loop *, tree); 35 extern tree resolve_mixers (struct loop *, tree); 36 extern void gather_stats_on_scev_database (void); 37 extern void scev_analysis (void); 38 extern unsigned int scev_const_prop (void); 39 extern bool expression_expensive_p (tree); 40 extern bool simple_iv (struct loop *, struct loop *, tree, affine_iv *, bool); 41 extern tree compute_overall_effect_of_inner_loop (struct loop *, tree); 42 43 /* Returns the basic block preceding LOOP or ENTRY_BLOCK_PTR when the 44 loop is function's body. */ 45 46 static inline basic_block 47 block_before_loop (loop_p loop) 48 { 49 edge preheader = loop_preheader_edge (loop); 50 return (preheader ? preheader->src : ENTRY_BLOCK_PTR); 51 } 52 53 /* Analyze all the parameters of the chrec that were left under a 54 symbolic form. LOOP is the loop in which symbolic names have to 55 be analyzed and instantiated. */ 56 57 static inline tree 58 instantiate_parameters (struct loop *loop, tree chrec) 59 { 60 return instantiate_scev (block_before_loop (loop), loop, chrec); 61 } 62 63 /* Returns the loop of the polynomial chrec CHREC. */ 64 65 static inline struct loop * 66 get_chrec_loop (const_tree chrec) 67 { 68 return get_loop (CHREC_VARIABLE (chrec)); 69 } 70 71 #endif /* GCC_TREE_SCALAR_EVOLUTION_H */ 72