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