I think you should do the operation with the functions in emit-rtl.c.
Like the functions:add_insn_after, add_insn_before, df_insn_delete.
You could try those things.
2009/12/11 Jianzhang Peng <jianzhangp...@gmail.com>:
> I'm tring this function, but it have some problems. It seems not link
> the new insn in the double-list.
>
> void merge(rtx insn1,rtx insn2)
> {
> rtx par, pre,sur, insn;
>
> par = gen_rtx_PARALLEL (SFmode, rtvec_alloc (2));
>
> XVECEXP (par, 0, 0) = PATTERN(insn1);
> XVECEXP (par, 0, 1) = PATTERN(insn2);
>
> insn = make_insn_raw (par);
>
> sur = NEXT_INSN(insn1);
>
> PREV_INSN(insn) = insn1;
> NEXT_INSN(insn) = sur;
> delete_insn(insn1);
>
> delete_insn(insn2);
> }
>
>
> 2009/12/11 daniel tian <daniel.xnt...@gmail.com>:
>> 2009/12/11 Ian Lance Taylor <i...@google.com>:
>>> daniel tian <daniel.xnt...@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
>>
>
>
>
> --
> Jianzhang Peng
>
