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