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When playing with __builtin_bit_cast, I have noticed __builtin_clear_padding ICE on the G class below. The artificial field with D type has offset 0 and size 8 bytes, but the following artificial field with E type has offset 0 and size 0, so it triggers the asserts that we don't move current position backwards. Fixed by ignoring is_empty_type (TREE_TYPE (field)) fields, all of their bits are padding which is what is added when skipping over to next field anyway. 2020-11-27 Jakub Jelinek <jakub@redhat.com> PR libstdc++/88101 * gimple-fold.c (clear_padding_type): Ignore fields with is_empty_type types. * g++.dg/torture/builtin-clear-padding-3.C: New test.
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