[Bug 1753] Use -funroll-loops with umac.c

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1753

--- Comment #2 from Iain Morgan <imorgan at nas.nasa.gov> 2010-04-10 11:22:29 EST ---
Ah, yes, I hadn't considered the (lack of) portability with
-funroll loops. I haven't seen any detrimental effects adding it for
entire build process, but thought it might be better to take a more
surgical approach. Using --with-cflags should do the trick.

I've been using this performance tweak on Itanium for the past two
and thought that it was about time to pass on the observation to the
community. I have to admit that I almost didn't submit this bug when I
saw the marginal benefit on other architectures.

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