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Re: generate RTL sequence
2009/12/11 Ian Lance Taylor <iant@google.com>:
> daniel tian <daniel.xntian@gmail.com> 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