[Bug rtl-optimization/17482] [4.0 Regression] GCSE after reload replacing changing instructions

[stevenb at suse dot de]

------- Additional Comments From stevenb at suse dot de  2004-09-15 19:20 -------
Subject: Re:  [4.0 Regression] GCSE after reload replacing changing instructions

On Wednesday 15 September 2004 21:00, graham dot stott at btinternet dot com 
wrote:
> ------- Additional Comments From graham dot stott at btinternet dot com 
> 2004-09-15 19:00 ------- Subject: Re:  [4.0 Regression] GCSE after reload
> replacing changing instructions
>
> Steven,
>
> One thing that stands out from looking at the code is the routines
>
> record_last_set_info and mark_set don't appear to be taking any note
> of any REG_INC notes that may be present within the MEM's
>
> Should the existing code:
>
>   if (REG_P (dest))
>     record_last_reg_set_info (insn, REGNO (dest));
>   else if (MEM_P (dest))
>     record_last_mem_set_info (insn);
>
> contain this following check for registers  mentioned in REG_INC notes?
>
>   note = find_reg_note (insn, REG_INC, NULL_RTX);
>   if (note)
>     record_last_reg_set_info (insn, REGNO (XEXP (note, 0)));

That is what I thought too, see my patch in comment #6.
But apparently that does not fix the bug...



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17482