Return unknow from scev instantiation if the result is not above instantiate_below.
2009-07-30 Sebastian Pop <sebastian.pop@amd.com> * tree-scalar-evolution.c: Fix comment. (instantiate_scev_1): Return unknow from scev instantiation if the result is not above instantiate_below. From-SVN: r150290
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@ -1,3 +1,9 @@
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2009-07-30 Sebastian Pop <sebastian.pop@amd.com>
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* tree-scalar-evolution.c: Fix comment.
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(instantiate_scev_1): Return unknow from scev instantiation if the
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result is not above instantiate_below.
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2009-07-30 Sebastian Pop <sebastian.pop@amd.com>
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* tree-scalar-evolution.c (compute_overall_effect_of_inner_loop): Not
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@ -1893,18 +1893,16 @@ analyze_scalar_evolution_1 (struct loop *loop, tree var, tree res)
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return res;
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}
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/* Entry point for the scalar evolution analyzer.
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Analyzes and returns the scalar evolution of the ssa_name VAR.
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LOOP_NB is the identifier number of the loop in which the variable
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is used.
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/* Analyzes and returns the scalar evolution of the ssa_name VAR in
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LOOP. LOOP is the loop in which the variable is used.
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Example of use: having a pointer VAR to a SSA_NAME node, STMT a
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pointer to the statement that uses this variable, in order to
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determine the evolution function of the variable, use the following
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calls:
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unsigned loop_nb = loop_containing_stmt (stmt)->num;
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tree chrec_with_symbols = analyze_scalar_evolution (loop_nb, var);
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loop_p loop = loop_containing_stmt (stmt);
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tree chrec_with_symbols = analyze_scalar_evolution (loop, var);
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tree chrec_instantiated = instantiate_parameters (loop, chrec_with_symbols);
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*/
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@ -2177,7 +2175,9 @@ instantiate_scev_1 (basic_block instantiate_below,
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else
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res = chrec;
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if (res == NULL_TREE)
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if (res == NULL_TREE
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|| !dominated_by_p (CDI_DOMINATORS, instantiate_below,
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gimple_bb (SSA_NAME_DEF_STMT (res))))
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res = chrec_dont_know;
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}
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