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PR optimization/11059 * expr.c (can_store_by_pieces): Return true if length is zero. (store_by_pieces): If length is zero and endp is two, abort, othwerise, if length is zero and endp is not two, return "to". (clear_by_pieces): Do nothing if length is zero. (clear_storage): Do nothing if length is zero. (store_constructor): Simplify code when size is zero, or the target has already been cleared. This avoids emitting a blockage instruction when initializing empty structures. * g++.dg/opt/emptyunion.C: New testcase. From-SVN: r69049 |
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