Re: Help-The possible places where insn is splitted in greg pass

[Ian Lance Taylor <iant at google dot com>]

fanqifei <fanqifei@gmail.com> writes:

> 2010/1/13 fanqifei <fanqifei@gmail.com>:
>> Hi,
>> I am working on a micro controller and trying to port gcc(4.3.2) for it.
>> Not the compiling process runs into the following error:
>> a.c: In function 'task':
>> a.c:150: error: unrecognizable insn:
>> (insn 479 478 320 19 a:381 (set (reg:SI 12 a12)
>> ÂÂ Â Â Â(plus:SI (mult:SI (reg:SI 9 a9 [204])
>> ÂÂ Â Â Â Â Â Â Â(const_int 4 [0x4]))
>> ÂÂ Â Â Â Â Â(reg:SI 12 a12))) -1 (nil))
>> a.c:150: internal compiler error: in extract_insn, at recog.c:1990
>> Please submit a full bug report, ...
>>
>> This insn is generated in greg pass from another insn:
>> (insn 320 308 309 19 a.c:381 (set (reg:SI 207 [ <variable>.wrData ])
>> (mem/s:SI (plus:SI (mult:SI (reg:SI 204)
>> (const_int 4 [0x4]))
>> (reg/f:SI 234)) [5 <variable>.wrData+0 S4 A32])) 3 {movsi}
>> (expr_list:REG_DEAD (reg:SI 204)
>> (nil)))
>> I surfed the web a bit and found similar gcc bug report 37436
>> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37436.
>> But basically they are not same.
>>
>> Can someone show me the possible places where insn#479 is generated in
>> reload.c or reload1.c?
>> Thanks!
>>
>> Qifei Fan
>>
> Is there anyone can help?

There are many places where that insn could be generated, so it's
pretty hard to answer your question as asked.

I recommend setting a breakpoint on make_insn_raw if
cfun->emit->x_cur_insn_uid == 479.  Then a backtrace will show you
what is creating the insn.

Ian