http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50765
Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Priority|P3 |P1 Status|UNCONFIRMED |NEW Last reconfirmed| |2011-10-27 Ever Confirmed|0 |1 --- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-10-27 11:11:15 UTC --- Confirmed. #2 0x0000000000a41dad in expand_insn (icode=CODE_FOR_vec_unpacks_lo_v4si, nops=2, ops=0x7fffffffcb60) at /space/rguenther/src/svn/trunk/gcc/optabs.c:7824 7824 gcc_unreachable (); (gdb) l 7819 void 7820 expand_insn (enum insn_code icode, unsigned int nops, 7821 struct expand_operand *ops) 7822 { 7823 if (!maybe_expand_insn (icode, nops, ops)) 7824 gcc_unreachable (); It seems we expand some useless unpacking?