X-Git-Url: http://git.sourceforge.jp/view?p=pf3gnuchains%2Fgcc-fork.git;a=blobdiff_plain;f=gcc%2Ftree-chrec.h;h=c908ec5c66b49417c1dc7f9cb516da44831414b1;hp=c22867ba0d2c29c505e940994d00a928827f38c7;hb=d8d756b9273c1fe8134c4ea53d88baea9ef82fc6;hpb=17519ba0dc05161d1dd4fba308eee373e9a9841b diff --git a/gcc/tree-chrec.h b/gcc/tree-chrec.h index c22867ba0d2..c908ec5c66b 100644 --- a/gcc/tree-chrec.h +++ b/gcc/tree-chrec.h @@ -1,12 +1,12 @@ /* Chains of recurrences. - Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc. + Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. Contributed by Sebastian Pop 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 2, or (at your option) any later +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 @@ -15,9 +15,8 @@ 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 COPYING. If not, write to the Free -Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301, USA. */ +along with GCC; see the file COPYING3. If not see +. */ #ifndef GCC_TREE_CHREC_H #define GCC_TREE_CHREC_H @@ -34,17 +33,16 @@ extern GTY(()) tree chrec_known; include it in the following function. */ static inline bool -automatically_generated_chrec_p (tree chrec) +automatically_generated_chrec_p (const_tree chrec) { - return (chrec == chrec_not_analyzed_yet - || chrec == chrec_dont_know + return (chrec == chrec_dont_know || chrec == chrec_known); } /* The tree nodes aka. CHRECs. */ static inline bool -tree_is_chrec (tree expr) +tree_is_chrec (const_tree expr) { if (TREE_CODE (expr) == POLYNOMIAL_CHREC || automatically_generated_chrec_p (expr)) @@ -60,6 +58,7 @@ extern tree chrec_fold_plus (tree, tree, tree); extern tree chrec_fold_minus (tree, tree, tree); extern tree chrec_fold_multiply (tree, tree, tree); extern tree chrec_convert (tree, tree, tree); +extern tree chrec_convert_rhs (tree, tree, tree); extern tree chrec_convert_aggressive (tree, tree); /* Operations. */ @@ -73,18 +72,49 @@ extern tree reset_evolution_in_loop (unsigned, tree, tree); extern tree chrec_merge (tree, tree); /* Observers. */ -extern bool eq_evolutions_p (tree, tree); -extern bool is_multivariate_chrec (tree); +extern bool eq_evolutions_p (const_tree, const_tree); +extern bool is_multivariate_chrec (const_tree); extern bool chrec_is_positive (tree, bool *); -extern bool chrec_contains_symbols (tree); -extern bool chrec_contains_symbols_defined_in_loop (tree, unsigned); -extern bool chrec_contains_undetermined (tree); -extern bool tree_contains_chrecs (tree, int *); -extern bool evolution_function_is_affine_multivariate_p (tree); -extern bool evolution_function_is_univariate_p (tree); +extern bool chrec_contains_symbols (const_tree); +extern bool chrec_contains_symbols_defined_in_loop (const_tree, unsigned); +extern bool chrec_contains_undetermined (const_tree); +extern bool tree_contains_chrecs (const_tree, int *); +extern bool evolution_function_is_affine_multivariate_p (const_tree, int); +extern bool evolution_function_is_univariate_p (const_tree); extern unsigned nb_vars_in_chrec (tree); +extern bool evolution_function_is_invariant_p (tree, int); - +/* Determines whether CHREC is equal to zero. */ + +static inline bool +chrec_zerop (const_tree chrec) +{ + if (chrec == NULL_TREE) + return false; + + if (TREE_CODE (chrec) == INTEGER_CST) + return integer_zerop (chrec); + + return false; +} + +/* Determines whether CHREC is a loop invariant with respect to LOOP_NUM. + Set the result in RES and return true when the property can be computed. */ + +static inline bool +no_evolution_in_loop_p (tree chrec, unsigned loop_num, bool *res) +{ + tree scev; + + if (chrec == chrec_not_analyzed_yet + || chrec == chrec_dont_know + || chrec_contains_symbols_defined_in_loop (chrec, loop_num)) + return false; + + scev = hide_evolution_in_other_loops_than_loop (chrec, loop_num); + *res = !tree_is_chrec (scev); + return true; +} /* Build a polynomial chain of recurrence. */ @@ -93,38 +123,36 @@ build_polynomial_chrec (unsigned loop_num, tree left, tree right) { + bool val; + if (left == chrec_dont_know || right == chrec_dont_know) return chrec_dont_know; - gcc_assert (TREE_TYPE (left) == TREE_TYPE (right)); - - return build3 (POLYNOMIAL_CHREC, TREE_TYPE (left), - build_int_cst (NULL_TREE, loop_num), left, right); -} + if (no_evolution_in_loop_p (left, loop_num, &val) && !val) + return chrec_dont_know; - + /* Pointer types should occur only on the left hand side, i.e. in + the base of the chrec, and not in the step. */ + gcc_assert (!POINTER_TYPE_P (TREE_TYPE (right))); -/* Observers. */ + /* Types of left and right sides of a chrec should be compatible. */ + if (POINTER_TYPE_P (TREE_TYPE (left))) + gcc_assert (sizetype == TREE_TYPE (right)); + else + gcc_assert (TREE_TYPE (left) == TREE_TYPE (right)); -/* Determines whether CHREC is equal to zero. */ + if (chrec_zerop (right)) + return left; -static inline bool -chrec_zerop (tree chrec) -{ - if (chrec == NULL_TREE) - return false; - - if (TREE_CODE (chrec) == INTEGER_CST) - return integer_zerop (chrec); - - return false; + return build3 (POLYNOMIAL_CHREC, TREE_TYPE (left), + build_int_cst (NULL_TREE, loop_num), left, right); } /* Determines whether the expression CHREC is a constant. */ static inline bool -evolution_function_is_constant_p (tree chrec) +evolution_function_is_constant_p (const_tree chrec) { if (chrec == NULL_TREE) return false; @@ -140,11 +168,10 @@ evolution_function_is_constant_p (tree chrec) } } -extern bool evolution_function_is_invariant_p (tree, int); /* Determine whether the given tree is an affine evolution function or not. */ static inline bool -evolution_function_is_affine_p (tree chrec) +evolution_function_is_affine_p (const_tree chrec) { if (chrec == NULL_TREE) return false; @@ -169,7 +196,7 @@ evolution_function_is_affine_p (tree chrec) function. */ static inline bool -evolution_function_is_affine_or_constant_p (tree chrec) +evolution_function_is_affine_or_constant_p (const_tree chrec) { return evolution_function_is_affine_p (chrec) || evolution_function_is_constant_p (chrec); @@ -178,33 +205,15 @@ evolution_function_is_affine_or_constant_p (tree chrec) /* Determines whether EXPR does not contains chrec expressions. */ static inline bool -tree_does_not_contain_chrecs (tree expr) +tree_does_not_contain_chrecs (const_tree expr) { return !tree_contains_chrecs (expr, NULL); } -/* Determines whether CHREC is a loop invariant with respect to LOOP_NUM. - Set the result in RES and return true when the property can be computed. */ - -static inline bool -no_evolution_in_loop_p (tree chrec, unsigned loop_num, bool *res) -{ - tree scev; - - if (chrec == chrec_not_analyzed_yet - || chrec == chrec_dont_know - || chrec_contains_symbols_defined_in_loop (chrec, loop_num)) - return false; - - scev = hide_evolution_in_other_loops_than_loop (chrec, loop_num); - *res = !tree_is_chrec (scev); - return true; -} - /* Returns the type of the chrec. */ static inline tree -chrec_type (tree chrec) +chrec_type (const_tree chrec) { if (automatically_generated_chrec_p (chrec)) return NULL_TREE;