+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.
+
2009-07-30 Sebastian Pop <sebastian.pop@amd.com>
* tree-scalar-evolution.c (compute_overall_effect_of_inner_loop): Not
return res;
}
-/* Entry point for the scalar evolution analyzer.
- Analyzes and returns the scalar evolution of the ssa_name VAR.
- LOOP_NB is the identifier number of the loop in which the variable
- is used.
+/* Analyzes and returns the scalar evolution of the ssa_name VAR in
+ LOOP. LOOP is the loop in which the variable is used.
Example of use: having a pointer VAR to a SSA_NAME node, STMT a
pointer to the statement that uses this variable, in order to
determine the evolution function of the variable, use the following
calls:
- unsigned loop_nb = loop_containing_stmt (stmt)->num;
- tree chrec_with_symbols = analyze_scalar_evolution (loop_nb, var);
+ loop_p loop = loop_containing_stmt (stmt);
+ tree chrec_with_symbols = analyze_scalar_evolution (loop, var);
tree chrec_instantiated = instantiate_parameters (loop, chrec_with_symbols);
*/
else
res = chrec;
- if (res == NULL_TREE)
+ if (res == NULL_TREE
+ || !dominated_by_p (CDI_DOMINATORS, instantiate_below,
+ gimple_bb (SSA_NAME_DEF_STMT (res))))
res = chrec_dont_know;
}