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* tree-ssa-forwprop.c (record_single_argument_cond_exprs): Accept new parameters for the statement and variable worklist as well as a bitmap of interesting SSA_NAMEs. Walk over the statement worklist recording interesting variables in the variable worklist and bitmap. Handle casts between integral and boolean types. (substitute_single_use_vars): Accept new parameters for the statement and variable worklist. When a substitution is made add a new entry to the statement worklist. Handle casts between integral and boolean types. (tree_ssa_forward_propagate_single_use_vars): Rework to pass worklists to children. Iterate until the statement worklist is empty. * gcc.dg/tree-ssa/20040513-1.c: New test. * gcc.dg/tree-ssa/20040513-2.c: New test. From-SVN: r81803
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