Effect of -fno-reorder-blocks?

Jeff Law law@porcupine.cygnus.com
Mon Nov 18 17:41:00 GMT 2002


In message <200211182045.gAIKjin2021714@ignucius.axis.se>, Hans-Peter Nilsson w
rites:
 >> Date: Mon, 18 Nov 2002 15:23:08 -0500
 >> From: Diego Novillo <dnovillo@redhat.com>
 >
 >> > FWIW, I see only that change in the SPEC95 results.  Nothing
 >> >
 >> Since I'm not tracking mainline with the SPEC2000 runs I didn't
 >> think they would interest you.  I can add it for tonight's run if
 >> you'd like.
 >
 >Thanks but I don't think that's necessary.  I think the SPEC95
 >results are conclusive: the effect of -f(no-)reorder-blocks is
 >minimal for this machine (PIII).
I'd expect reorder-blocks to have the most effect on targets that do static
prediction of branches (such at BTFNT).  These schemes still show up in
embedded systems (and of course older desktops like the PA1.1 based 
targets).

jeff




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