1 /* Scalar evolution detector. 2 Copyright (C) 2003-2018 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 gcond *get_loop_exit_condition (const struct loop *); 26 27 extern void scev_initialize (void); 28 extern bool scev_initialized_p (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 (edge, struct loop *, tree); 34 extern tree resolve_mixers (struct loop *, tree, bool *); 35 extern void gather_stats_on_scev_database (void); 36 extern void final_value_replacement_loop (struct loop *); 37 extern unsigned int scev_const_prop (void); 38 extern bool expression_expensive_p (tree); 39 extern bool simple_iv_with_niters (struct loop *, struct loop *, tree, 40 struct affine_iv *, tree *, bool); 41 extern bool simple_iv (struct loop *, struct loop *, tree, struct affine_iv *, 42 bool); 43 extern bool iv_can_overflow_p (struct loop *, tree, tree, tree); 44 extern tree compute_overall_effect_of_inner_loop (struct loop *, tree); 45 46 /* Returns the basic block preceding LOOP, or the CFG entry block when 47 the loop is function's body. */ 48 49 static inline basic_block 50 block_before_loop (loop_p loop) 51 { 52 edge preheader = loop_preheader_edge (loop); 53 return (preheader ? preheader->src : ENTRY_BLOCK_PTR_FOR_FN (cfun)); 54 } 55 56 /* Analyze all the parameters of the chrec that were left under a 57 symbolic form. LOOP is the loop in which symbolic names have to 58 be analyzed and instantiated. */ 59 60 static inline tree 61 instantiate_parameters (struct loop *loop, tree chrec) 62 { 63 return instantiate_scev (loop_preheader_edge (loop), loop, chrec); 64 } 65 66 /* Returns the loop of the polynomial chrec CHREC. */ 67 68 static inline struct loop * 69 get_chrec_loop (const_tree chrec) 70 { 71 return get_loop (cfun, CHREC_VARIABLE (chrec)); 72 } 73 74 #endif /* GCC_TREE_SCALAR_EVOLUTION_H */ 75