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[lra] add most common case to choose reg class for split pseudo


I found there are too many rejecting pseudo splits because I excluded most common case of choosing register class for split pseudo.

The following patch fixes this.

Committed as rev. 184315.

2012-02-16 Vladimir Makarov <vmakarov@redhat.com>

    * lra-constraints.c (choose_split_class): Check allocno_class too.
    (split_pseudo): Print more debug info about split rejecting
    because of reg class.

Attachment: split-class.patch
Description: Text document


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