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Diffstat (limited to 'gcc/vr-values.h')
| -rw-r--r-- | gcc/vr-values.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/gcc/vr-values.h b/gcc/vr-values.h new file mode 100644 index 00000000000..20bd6c57a6c --- /dev/null +++ b/gcc/vr-values.h @@ -0,0 +1,121 @@ +/* Support routines for Value Range Propagation (VRP). + Copyright (C) 2016-2017 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_VR_VALUES_H +#define GCC_VR_VALUES_H + +/* The VR_VALUES class holds the current view of range information + for all the SSA_NAMEs in the IL. + + It can be used to hold context sensitive range information during + a dominator walk or it may be used to hold range information in the + standard VRP pass as ranges are propagated through the lattice to a + steady state. + + This information is independent of the range information that gets + attached to SSA_NAMEs. A pass such as VRP may choose to transfer + the global information it produces into global range information that + gets attached to an SSA_NAME. It's unclear how useful that global + information will be in a world where we can compute context sensitive + range information fast or perform on-demand queries. */ +class vr_values +{ + public: + vr_values (void); + ~vr_values (void); + + /* Value range array. After propagation, VR_VALUE[I] holds the range + of values that SSA name N_I may take. */ + unsigned int num_vr_values; + value_range **vr_value; + bool values_propagated; + + /* For a PHI node which sets SSA name N_I, VR_COUNTS[I] holds the + number of executable edges we saw the last time we visited the + node. */ + int *vr_phi_edge_counts; + + /* Allocation pools for tree-vrp allocations. */ + object_allocator<value_range> vrp_value_range_pool; + bitmap_obstack vrp_equiv_obstack; + + value_range *get_value_range (const_tree); + void set_vr_value (tree, value_range *); + + void set_defs_to_varying (gimple *); + bool update_value_range (const_tree, value_range *); + void add_equivalence (bitmap *, const_tree); + bool vrp_stmt_computes_nonzero (gimple *); + tree op_with_constant_singleton_value_range (tree); + bool op_with_boolean_value_range_p (tree); + bool check_for_binary_op_overflow (enum tree_code, tree, tree, tree, bool *); + void adjust_range_with_scev (value_range *, struct loop *, gimple *, tree); + value_range get_vr_for_comparison (int); + tree compare_name_with_value (enum tree_code, tree, tree, bool *, bool); + tree compare_names (enum tree_code, tree, tree, bool *); + bool two_valued_val_range_p (tree, tree *, tree *); + + tree vrp_evaluate_conditional_warnv_with_ops_using_ranges (enum tree_code, + tree, tree, + bool *); + tree vrp_evaluate_conditional_warnv_with_ops (enum tree_code, + tree, tree, bool, + bool *, bool *); + tree vrp_evaluate_conditional (tree_code, tree, tree, gimple *); + + + void dump_all_value_ranges (FILE *); + + void extract_range_for_var_from_comparison_expr (tree, enum tree_code, + tree, tree, value_range *); + void extract_range_from_assert (value_range *, tree); + void extract_range_from_ssa_name (value_range *, tree); + void extract_range_from_binary_expr (value_range *, enum tree_code, + tree, tree, tree); + void extract_range_from_unary_expr (value_range *, enum tree_code, + tree, tree); + void extract_range_from_phi_node (gphi *, value_range *); + void extract_range_from_cond_expr (value_range *, gassign *); + void extract_range_basic (value_range *, gimple *); + void extract_range_from_assignment (value_range *, gassign *); + void extract_range_from_stmt (gimple *, edge *, tree *, value_range *); + void extract_range_from_comparison (value_range *, enum tree_code, + tree, tree, tree); + + void vrp_visit_assignment_or_call (gimple*, tree *, value_range *); + void vrp_visit_switch_stmt (gswitch *, edge *); + void vrp_visit_cond_stmt (gcond *, edge *); + + bool simplify_truth_ops_using_ranges (gimple_stmt_iterator *, gimple *); + bool simplify_div_or_mod_using_ranges (gimple_stmt_iterator *, gimple *); + bool simplify_abs_using_ranges (gimple_stmt_iterator *, gimple *); + bool simplify_bit_ops_using_ranges (gimple_stmt_iterator *, gimple *); + bool simplify_min_or_max_using_ranges (gimple_stmt_iterator *, gimple *); + bool simplify_cond_using_ranges_1 (gcond *); + void simplify_cond_using_ranges_2 (gcond *); + bool simplify_switch_using_ranges (gswitch *); + bool simplify_float_conversion_using_ranges (gimple_stmt_iterator *, + gimple *); + bool simplify_internal_call_using_ranges (gimple_stmt_iterator *, gimple *); + bool simplify_stmt_using_ranges (gimple_stmt_iterator *); +}; + +#define VR_INITIALIZER { VR_UNDEFINED, NULL_TREE, NULL_TREE, NULL } + +#endif /* GCC_VR_VALUES_H */ |