Lars Poeschel <larsi@xxxxxxxxxxxxxxxxx> writes: > I have the following statement, which fails with general compiler errror in > gen_rtx_SUBREG, at emit-rtl.c:729 > > (define_split > [(set (match_operand:DI 0 "memory_operand" "=m") > (match_operand:DI 1 "register_operand" "r"))] > "" > [(set (mem:SI (match_dup 0) ) > (subreg:SI (match_dup 1) 0)) > (set (mem:SI (plus:SI (match_dup 0) (const_int 4))) > (subreg:SI (match_dup 1) 1))] > "") > > What I want to do is implementing the movdi on a 32 bit platform. This split > is a special case for memory destination and register source. I want to split > the 64 bit move into 2 32 bit moves. What am I doing wrong ? Anyone an idea ? In general, with some exceptions, you shouldn't use an explicit subreg in an insn pattern. You should instead just use (match_dup N), and in your C code use operands[N] = simplify_gen_subreg (...). Otherwise you can wind up with a subreg of a subreg which is forbidden. Ian
