https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116325
--- Comment #1 from Georg-Johann Lay <gjl at gcc dot gnu.org> --- Created attachment 58945 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58945&action=edit C++ test case from libstdc++v3 This is a test case from libstdc++v3. Compile with $ avr-g++ pr116389.cpp -S -dumpbase "" -O2 -mmcu=avrtiny -dp -fdump-rtl-ira-details -fdump-rtl-reload-details -mlra error: unable to generate reloads for: (call_insn/j 43 42 44 8 (parallel [ (set (reg:HI 24 r24) (call (mem:HI (reg/f:HI 45 [ _8 ]) [0 *OBJ_TYPE_REF(_8;this_1(D)->7B) S2 A8]) (const_int 2 [0x2]))) (use (const_int 1 [0x1])) ]) "/ssd1/build/avr/gcc-bug/avr/avrtiny/libstdc++-v3/include/bits/locale_facets.h":917:23 774 {call_value_insn} (expr_list:REG_DEAD (reg/f:HI 45 [ _8 ]) (expr_list:REG_DEAD (reg:QI 35 argH) (expr_list:REG_DEAD (reg:HI 22 r22) (expr_list:REG_DEAD (reg:HI 20 r20) (expr_list:REG_UNUSED (reg:HI 24 r24) (expr_list:REG_CALL_DECL (nil) (nil))))))) (expr_list:HI (use (reg:HI 24 r24)) (expr_list:HI (use (reg:HI 22 r22)) (expr_list:HI (use (reg:HI 20 r20)) (expr_list:HI (use (mem/f:HI (reg/f:HI 34 argL) [0 S2 A8])) (nil)))))) during RTL pass: reload dump file: pr116389.cpp.317r.reload /ssd1/build/avr/gcc-bug/avr/avrtiny/libstdc++-v3/include/bits/locale_facets.h:918:7: internal compiler error: in curr_insn_transform, at lra-constraints.cc:4283
