https://gcc.gnu.org/bugzilla/show_bug.cgi?id=30277
--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> --- Author: jason Date: Mon Sep 16 04:34:28 2019 New Revision: 275746 URL: https://gcc.gnu.org/viewcvs?rev=275746&root=gcc&view=rev Log: PR c++/30277 - int-width bit-field promotion. Here, if cp_perform_integral_promotions saw that the TREE_TYPE of a bit-field reference was the same as the type it promotes to, it didn't do anything. But then decay_conversion saw that the bit-field reference was unchanged, and converted it to its declared type. So I needed to add something to make it clear that promotion has been done. But then the 33819 change caused trouble by looking through the NOP_EXPR I just added. This was the wrong fix for that bug; I've now fixed that better by recognizing in cp_perform_integral_promotions that we won't promote a bit-field larger than 32 bits, so we should use the declared type. PR c++/33819 - long bit-field promotion. * typeck.c (cp_perform_integral_promotions): Handle large bit-fields properly. Handle 32-bit non-int bit-fields properly. (is_bitfield_expr_with_lowered_type): Don't look through NOP_EXPR. Added: trunk/gcc/testsuite/g++.dg/expr/bitfield14.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/typeck.c
