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Where a CSEL can return the value 1 as one of the alternatives, it is usually more efficient to use a CSINC than a CSEL (and never less efficient), since the value of 1 can be derived from wzr, rather than needing to set it up in a register first.
This patch enables this capability.
It has been regression tested on trunk.
OK for commit?
Cheers, Ian
Thanks /Marcus
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