| /* Header file for SSA loop optimizations. |
| Copyright (C) 2013-2017 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef GCC_TREE_SSA_LOOP_H |
| #define GCC_TREE_SSA_LOOP_H |
| |
| |
| /* Affine iv. */ |
| |
| struct affine_iv |
| { |
| /* Iv = BASE + STEP * i. */ |
| tree base, step; |
| |
| /* True if this iv does not overflow. */ |
| bool no_overflow; |
| }; |
| |
| /* Description of number of iterations of a loop. All the expressions inside |
| the structure can be evaluated at the end of the loop's preheader |
| (and due to ssa form, also anywhere inside the body of the loop). */ |
| |
| struct tree_niter_desc |
| { |
| tree assumptions; /* The boolean expression. If this expression evaluates |
| to false, then the other fields in this structure |
| should not be used; there is no guarantee that they |
| will be correct. */ |
| tree may_be_zero; /* The boolean expression. If it evaluates to true, |
| the loop will exit in the first iteration (i.e. |
| its latch will not be executed), even if the niter |
| field says otherwise. */ |
| tree niter; /* The expression giving the number of iterations of |
| a loop (provided that assumptions == true and |
| may_be_zero == false), more precisely the number |
| of executions of the latch of the loop. */ |
| widest_int max; /* The upper bound on the number of iterations of |
| the loop. */ |
| |
| /* The simplified shape of the exit condition. The loop exits if |
| CONTROL CMP BOUND is false, where CMP is one of NE_EXPR, |
| LT_EXPR, or GT_EXPR, and step of CONTROL is positive if CMP is |
| LE_EXPR and negative if CMP is GE_EXPR. This information is used |
| by loop unrolling. */ |
| affine_iv control; |
| tree bound; |
| enum tree_code cmp; |
| }; |
| |
| extern bool for_each_index (tree *, bool (*) (tree, tree *, void *), void *); |
| extern char *get_lsm_tmp_name (tree ref, unsigned n, const char *suffix = NULL); |
| extern unsigned tree_num_loop_insns (struct loop *, struct eni_weights *); |
| |
| /* Returns the loop of the statement STMT. */ |
| |
| static inline struct loop * |
| loop_containing_stmt (gimple *stmt) |
| { |
| basic_block bb = gimple_bb (stmt); |
| if (!bb) |
| return NULL; |
| |
| return bb->loop_father; |
| } |
| |
| #endif /* GCC_TREE_SSA_LOOP_H */ |