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* simplify-rtx.c (simplify_binary_operation): Simplify ((A & N) + B) & M -> (A + B) & M if M is pow2 minus 1 constant and N has at least all bits in M set as well. PR tree-optimization/15310 * expr.c (expand_assignment): Optimize += or -= on a bit field in most significant bits. * gcc.c-torture/execute/20040629-1.c: New test. From-SVN: r83900
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