(define_expand "movsi"
[(set (match_operand:SI 0 "nonimmediate_operand" "")
(match_operand:SI 1 "general_operand" "")
)]
""
{
if(GET_CODE(operands[0])==MEM && GET_CODE(operands[1])!=REG)
{
if(!no_new_pseudos)
{
operands[1]=force_reg(SImode,operands[1]);
}
}
printf("Here1\n");
emit_move_insn (operands[0], operands[1]);
printf("Here2\n");
DONE;
}
)
I have confirmed it will cause the recursion. The emit_move_insn will
call emit_move_insn again. So if the operands are valid in machine
assemble, I need to use gen*-move function, such as gen_load,
gen_store, or just let the define_expand to generate RTL. Like the
following, It won't cause recursion call:
(define_expand "movsi"
[(set (match_operand:SI 0 "nonimmediate_operand" "")
(match_operand:SI 1 "general_operand" "")
)]
""
{
if(GET_CODE(operands[0])==MEM && GET_CODE(operands[1])!=REG)
{
if(!no_new_pseudos)
{
operands[1]=force_reg(SImode,operands[1]);
}
printf("Here1\n");
emit_move_insn (operands[0], operands[1]);
printf("Here2\n");
DONE;
}
else
printf("Here3\n");
}
)
I should read more code in backend to avoid making such problems. ^_^
. Sorry for interruptting you.
Thank you very much.
Tian Xiaonan
2008/12/18 Uday P. Khedker <u...@cse.iitb.ac.in>:
> Yes, please keep me updated.
>
>> Hi Dr. Uday Khedker: I just found a something. I added 'emit_move_insn'
>> function into theoriginal file in spim5.md which was downloaded from your
>> website,everything seems fine. But I added into the file which I
>> havemodified, the cc1 will crash. I wll find the resean. Sorry, I
>> thinkit's my fault. and I will send the reason to you later.
>> Thank you.
>> Best wishes.
>>
>> Tian Xiaonan2008/12/18 Uday P.
>> Khedker <u...@cse.iitb.ac.in>>> Hi
>> Tian,>> I have an explanation for
>> it but let me first verify and
>> make sure> that the details are
>> correct. Will get back to you in a
>> day or two.>> Uday Khedker.>
>> ---------------------------------------------------------------------->
>> Dr. Uday Khedker> Associate
>> Professor> Department of Computer
>> Science & Engg.> IIT Bombay,
>> Powai, Mumbai 400 076, India.>
>> email : u...@cse.iitb.ac.in>
>> homepage:
>> http://www.cse.iitb.ac.in/~uday>
>> phone : Office - 91 (22) 2576
>> 7717> Res. - 91 (22)
>> 2576 8717, 91 (22) 2572 0288>
>> ---------------------------------------------------------------------->>>
>> > Hello, Dr. Uday Khedker:> > I
>> just found that emit_move_insn
>> function can't be used in> >
>> define_expand pattern in the spim
>> gcc4.0.2 platform. It will cause
>> the> > Segmentation Fault.
>> Something like recursion
>> happened.> > I changed the
>> define_expand "movsi" from:> >> >
>> (define_expand "movsi"> >
>> [(set (match_operand:SI 0
>> "nonimmediate_operand" "")> >
>> (match_operand:SI 1
>> "general_operand" "")> > )]>
>> > ""> > {> >
>> if(GET_CODE(operands[0])==MEM &&
>> GET_CODE(operands[1])!=REG)> >
>> {> >
>> if(!no_new_pseudos)> >
>> {> >
>> operands[1]=force_reg(SImode,operands[1]);>
>> > }> > }> >
>> }> > )> >> > to :> >> >
>> (define_expand "movsi"> >
>> [(set (match_operand:SI 0
>> "nonimmediate_operand" "")> >
>> (match_operand:SI 1
>> "general_operand" "")> > )]>
>> > ""> > {> >
>> if(GET_CODE(operands[0])==MEM &&
>> GET_CODE(operands[1])!=REG)> >
>> {> >
>> if(!no_new_pseudos)> >
>> {> >
>> operands[1]=force_reg(SImode,operands[1]);>
>> > }> > }> >
>> printf("Here1\n");> >
>> emit_move_insn (operands[0],
>> operands[1]);> >
>> printf("Here2\n");> >
>> DONE;> > }> > )> >> > The
>> string 'Here2' nerver come out.
>> Before Segmentation fault
>> occurred,> > cc1 prints lots of
>> the 'Here1'. So I guess the
>> function emit_move_insn> > caused
>> the recursion. But I checked the
>> mips md files. Mips also used the>
>> > emit_move_insn function in
>> define_expand "movsi" pattern. So
>> I guess> > whether I missed
>> something in md file. Can you give
>> me any advices?> >> > Thank you
>> very much.> >> > Best Wishes.> >
>>
>> Tian Xiaonan> >> >> >
>> --- On Tue, 12/9/08, Uday P.
>> Khedker <u...@cse.iitb.ac.in>
>> wrote:> >> >> From: Uday P.
>> Khedker <u...@cse.iitb.ac.in>> >>
>> Subject: Re: redundancy code> >>
>> To: tianxiaonan2...@yahoo.com.cn>
>> >> Date: Tuesday, December 9,
>> 2008, 12:25 PM> >> Hi Tian,> >>>
>> >> The goal of our machine
>> descriptions has been to identify>
>> >> the> >> minimal and hence
>> essential parts of machine
>> descriptions> >> in> >> order to
>> generate correct code. Improving
>> the code quality> >> has> >> not
>> been addressed in these
>> descriptions. In due course of> >>
>> time,> >> we should be able to
>> devise methodology for developing>
>> >> machine> >> descriptions that
>> address optimizations also.> >>>
>> >> If you are interested in
>> pursuing this idea, I will be> >>
>> happy to> >> interact with you.>
>> >>> >> With best regards,> >>> >>
>> Uday Khedker.> >>
>> ---------------------------------------------------------------------->
>> >> Dr. Uday Khedker> >> Associate
>> Professor> >> Department of
>> Computer Science & Engg.> >> IIT
>> Bombay, Powai, Mumbai 400 076,
>> India.> >> email :
>> u...@cse.iitb.ac.in> >> homepage:
>> http://www.cse.iitb.ac.in/~uday>
>> >> phone : Office - 91 (22) 2576
>> 7717> >> Res. - 91
>> (22) 2576 8717, 91 (22) 2572 0288>
>> >>
>> ---------------------------------------------------------------------->
>> >>> >>> >> > Hello,> >> > I
>> used the spim5 gcc 4.0.2 to study
>> gcc port. but I> >> found there
>> are> >> > lots of the 'move' insns
>> redundancy code. For> >> example,
>> the C code like> >> > this:> >> >
>> i=1;> >> > i = i + 5;> >> > the
>> Spim compiler will generate the
>> code like the> >> following(PS:RX
>> is the> >> > register) .> >> > li
>> R0, #1> >> > SW R0, 0(MEM)> >>
>> > LW R0, 0(MEM)> >> > Addi R0,
>> R0, #5> >> > SW R0, 0(MEM)> >>
>> >> >> > Obviously, there are two
>> insn redundancy. What> >> confused
>> me is how it> >> > generated. Is
>> problem in the 'define_insn mov'>
>> >> pattern or the> >> >
>> define_peephole insn?> >> >> >> >
>> spim5 porting backend code> >> >>
>> >>
>> here:http://www.cse.iitb.ac.in/~uday/gcc-workshop/downloads/IITB-Incremental-Machine-Descriptions/>
>> >> > Thank you.> >> >> >> Tian
>> Xiaonan> >> >> >> >> >> >> >> >>
>> >> >> >>
>> ___________________________________________________________>
>> >> >> >>
>> 好玩贺卡等你发，邮箱贺卡全新上线！>
>> >> >
>> http://card.mail.cn.yahoo.com/> >>
>> >> >> >> >> >>
>>
>
>
