1/* Scalar evolution detector. 2 Copyright (C) 2003-2015 Free Software Foundation, Inc. 3 Contributed by Sebastian Pop <s.pop@laposte.net> 4 5This file is part of GCC. 6 7GCC is free software; you can redistribute it and/or modify it under 8the terms of the GNU General Public License as published by the Free 9Software Foundation; either version 3, or (at your option) any later 10version. 11 12GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13WARRANTY; without even the implied warranty of MERCHANTABILITY or 14FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15for more details. 16 17You should have received a copy of the GNU General Public License 18along 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 24extern tree number_of_latch_executions (struct loop *); 25extern gcond *get_loop_exit_condition (const struct loop *); 26 27extern void scev_initialize (void); 28extern bool scev_initialized_p (void); 29extern void scev_reset (void); 30extern void scev_reset_htab (void); 31extern void scev_finalize (void); 32extern tree analyze_scalar_evolution (struct loop *, tree); 33extern tree instantiate_scev (basic_block, struct loop *, tree); 34extern tree resolve_mixers (struct loop *, tree); 35extern void gather_stats_on_scev_database (void); 36extern unsigned int scev_const_prop (void); 37extern bool expression_expensive_p (tree); 38extern bool simple_iv (struct loop *, struct loop *, tree, struct affine_iv *, 39 bool); 40extern tree compute_overall_effect_of_inner_loop (struct loop *, tree); 41 42/* Returns the basic block preceding LOOP, or the CFG entry block when 43 the loop is function's body. */ 44 45static inline basic_block 46block_before_loop (loop_p loop) 47{ 48 edge preheader = loop_preheader_edge (loop); 49 return (preheader ? preheader->src : ENTRY_BLOCK_PTR_FOR_FN (cfun)); 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 56static inline tree 57instantiate_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 64static inline struct loop * 65get_chrec_loop (const_tree chrec) 66{ 67 return get_loop (cfun, CHREC_VARIABLE (chrec)); 68} 69 70#endif /* GCC_TREE_SCALAR_EVOLUTION_H */ 71