2009/12/11 Ian Lance Taylor <[email protected]>:
> daniel tian <[email protected]> writes:
>
>> I have a problem about RTL sequence.
>> If I wanna generate the RTL in sequence, and don't let gcc to schedule
>> them.
>> Like the following(all the variable is rtx):
>>
>> emit_insn(reg0, operands[0]);
>> emit_insn(reg1, reg0);
>> emit_insn(operands[0], reg1);
>>
>> But gcc will will reorder the three rtl in optimization.
>> I just wanna the those rtl in one block as a unit, don't let the
>> gcc disrupt the sequence.
>> How can I do it?
>
> Write a single define_insn which emits the instructions you want to
> treat as a unit.
>
Does there any solution in RTL level?
Because I already solve the problem in ASM output level, exactly the
same solution as you suggest in this email.
I may need do some optimization later. So RTL level will be great!
Thanks for your advice.
Best Regards.
daniel.tian
