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When native_encode_initializer is called with non-NULL mask (i.e. ATM bit_cast only), it checks if the current index in the CONSTRUCTOR (if any) is the next initializable FIELD_DECL, and if not, decrements cnt and performs the iteration with that FIELD_DECL as field and val of zero (so that it computes mask properly). As the testcase shows, I forgot to set pos to the byte position of the field though (like it is done for e.g. index referenced FIELD_DECLs in the constructor. 2020-12-09 Jakub Jelinek <jakub@redhat.com> PR c++/98193 * fold-const.c (native_encode_initializer): Set pos to field's byte position if iterating over a field with missing initializer. * g++.dg/cpp2a/bit-cast7.C: New test.
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