[tree-ssa] S/390: Fix loops emitted by backend

[Andreas Jaeger]

Ulrich Weigand <weigand@i1.informatik.uni-erlangen.de> writes:

> Hello,
>
> this patch makes gcc bootstrap on the tree-ssa branch for 
> s390-ibm-linux and s390x-ibm-linux targets.  The problem was
> that we were manually constructing a loop in the string
> expanders, using the expand_exit_loop_top_cond routine.
>
> This doesn't work any longer as expected, since loop header
> copying isn't done on RTL any more; also, for some reason
> doloop now got confused into computing incorrect loop 
> iteration counts.
>
> Fixed by performing loop header copying manually.
>
> Bootstrapped/regtested on s390-ibm-linux and s390x-ibm-linux,
> applied to the tree-ssa branch.

Shouldn't this go also into mainline to make merging easier?

Andreas
-- 
 Andreas Jaeger, aj@suse.de, http://www.suse.de/~aj
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