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[arm] add tune_xscale flag


At present, the "arm_is_xscale" flag controls both tuning and
instruction set selection.  In Debian, we'd like to be able to use
-march=armv3 -mtune=xscale, so as to get tolerable instruction
scheduling but retain compatibility with older cores.  This patch adds a
separate flag to make that work.

p.

Attachment: xscale.diff
Description: Text document


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