This is the mail archive of the
gcc-help@gcc.gnu.org
mailing list for the GCC project.
Re: (set (reg:SI ) (scratch:SI)) unrecognizable insn
On Tue, Oct 6, 2009 at 9:31 AM, Ian Lance Taylor <iant@google.com> wrote:
> "Kim, Eunchan" <helpbygrace@gmail.com> writes:
>
>> On Tue, Oct 6, 2009 at 5:10 AM, Ian Lance Taylor <iant@google.com> wrote:
>>> "Kim, Eunchan" <helpbygrace@gmail.com> writes:
>>>
>>>> (insn 81 80 0 ../../../../sdk/gcc-4.3.3/libgcc/../gcc/unwind-dw2.c:1503
>>>> (parallel [
>>>> ? ? ? ? ? ? (set (mem:BLK (reg/v/f:SI 43 [ c ]) [0 S4 A8])
>>>> ? ? ? ? ? ? ? ? (unspec:BLK [
>>>> ? ? ? ? ? ? ? ? ? ? ? ? (reg:SI 75)
>>>> ? ? ? ? ? ? ? ? ? ? ? ? (mem:QI (reg/v/f:SI 43 [ c ]) [0 S1 A8])
>>>> ? ? ? ? ? ? ? ? ? ? ? ? (mem:BLK (reg/v/f:SI 43 [ c ]) [0 S4 A8])
>>>> ? ? ? ? ? ? ? ? ? ? ] 21))
>>>> ? ? ? ? ? ? (clobber (scratch:SI))
>>>> ? ? ? ? ]) -1 (nil))
>>>
>>> Where did this insn come from? ?(clobber (scratch:SI)) is something
>>> one might see in a reload insn pattern, but it shouldn't be in a
>>> normal insn patter.
>>>
>>> If you are trying to write an insn which does a memory copy and needs
>>> a scratch register, then you need to use a define_expand which calls
>>> gen_reg_rtx.
>>>
>>> Ian
>>>
>>
>> That insn is from gcc's error message when i compile
>> libgcc(unwind-dw2.c) with this gcc. I based on mips cross compiler.
>> But i'd rather make whole new. Because i do not fully understand mips
>> target description.
>
> I don't see any define_insn like that in mips.md. ?It looks like
> mov_<store>r, but that has no (clobber (scratch)) in it. ?So I think
> it is an insn you added or modified.
>
> Ian
>
Thank you for replying.
When i ported with mips.md, i did not touch any RTL template, i just
commented out some RTL, it means whole define_insn structure, and
modify the asm outputs. I searched my md file. I could not find any
rtl related to (clobber (scratch)). (clobber (scratch)) is in
(define_peephole2 and define_expand "<u>mulsidi3") of mips.md which i
already commented out.
Eunchan