https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104031
--- Comment #5 from Sergei Trofimovich <slyfox at gcc dot gnu.org> --- gcc-11 for comparison did not seem to have `struct InfoD.2399 D.2453 = {.arityD.2402=0};` style nodes and encoded stores explicitly: main.cc.244t.optimized: voidD.48 _GLOBAL__sub_I_main () { struct InfoD.2377 D.2496; ... D.2496.arityD.2380 = 0; and produced expected RTL: main.cc.245r.expand: ;; Function _GLOBAL__sub_I_main (_GLOBAL__sub_I_main, funcdef_no=14, decl_uid=2463, cgraph_uid=15, symbol_order=15) (executed once) ... ;; ;; Full RTL generated for this function: ;; 1: NOTE_INSN_DELETED 3: NOTE_INSN_BASIC_BLOCK 2 2: NOTE_INSN_FUNCTION_BEG 5: [r77:DI-0x4]=0 // <<<--- our lost store 6: {r82:DI=r77:DI-0x8;clobber flags:CC;} 7: si:DI=r82:DI 8: di:DI=`_ZL4s_op' 9: call [`_ZN14RegisterPrimOpC1E4Info'] argc:0 REG_CALL_DECL `_ZN14RegisterPrimOpC1E4Info' REG_EH_REGION 0