[Bug rtl-optimization/43653] [4.3/4.4/4.5/4.6 Regression] ICE at reload1.c:1188 with -O1 -ftree-vectorize and empty struct

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43653

--- Comment #11 from Jeffrey A. Law <law at redhat dot com> 2011-02-16 04:03:41 UTC ---
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On 02/15/11 15:42, ubizjak at gmail dot com wrote:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43653
> 
> --- Comment #10 from Uros Bizjak <ubizjak at gmail dot com> 2011-02-15 22:41:40 UTC ---
> (In reply to comment #9)
>> I think an x86 maintainer is going to need to take a look at this.
> 
>> Which simply isn't going to work and it's all downhill from there, including a
>> surprise secondary memory allocation which ultimately triggers the ICE.
>>
>> I was able to hack things to work by enabling a secondary reload when copying
>> (plus (sp) (whatever)) into SSE_REGS, but that may not be the best solution. 
>> Someone with more x86 internal knowledge should look at this.
> 
> Hm, indeed. SSE can't handle non-vector PLUS insn, so reload needs a bit of
> help.
It's unfortunate that reload decides to reload the constant offset, but
I suspect this kind of thing is exceedingly rare.

I'll let you own taking care of the PR since you've got a patch :-)

jeff
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