Hello All,
I have a question on move si and move di.
I have a target, which is essentially a 32-bit processor, but it has a
64-bit load and store instruction.
Now, there is a
define_insn movsi,
and that's all nice and fancy and working, but I also need a define_insn
movdi.
Simplified, it looks as follows:
(define_insn "movdi"
[(set (match_operand:DI 0 "blueproc_nonimmediate_operand" "=r,r,m")
(match_operand:DI 1 "input_operand" "r,m,r"))]
- The options 2 (m to r) and 3 (r to m), that is clear.
- The option 1 (r to r), the processor has no instruction for it. It
needs to be translated to
2x the movsi instruction. Now, I would prefer to avoid duplicating
the code written under the
'movsi', and call the movsi definition.
Q. Is this possible ?.
I mean, I found it can be done with define_split, but then the
compiler gets confused, splits the
instruction, and cannot do the rename any more to avoid the copying.
(There are cases where it should rename, and cases where it should
copy.) So, it should be done
in the define_insn, but I find no way to do it.
Best Regards,
Henri.
