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The following testcase is miscompiled on x86_64-linux, the bitfield store is implemented as a RMW 64-bit operation at d+24 when the d variable has size of only 28 bytes and scheduling moves in between the R and W part a store to a different variable that happens to be right after the d variable. The reason for this is that we weren't creating DECL_BIT_FIELD_REPRESENTATIVEs for bitfields in unions. The following patch does create them, but treats all such bitfields as if they were in a structure where the particular bitfield is the only field. 2021-06-16 Jakub Jelinek <jakub@redhat.com> PR middle-end/101062 * stor-layout.c (finish_bitfield_representative): For fields in unions assume nextf is always NULL. (finish_bitfield_layout): Compute bit field representatives also in unions, but handle it as if each bitfield was the only field in the aggregate. * gcc.dg/pr101062.c: New test.
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