Plan 9 from Bell Labs’s /n/sources/patch/applied/5c-extreg/readme

Copyright © 2009 Alcatel-Lucent.
Distributed under the Lucent Public License version 1.02.
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reserve two registers for extern register use, and ensure that
neither they nor any other special register can be allocated
to temporaries or variables

also use temporary registers cyclically even though `strongarm does register forwarding'
because it will forward without that, and not all arms are strongarms.

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