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Re: gcc compile-time statistics
From: Geoff Keating <firstname.lastname@example.org>
Date: 18 May 2002 19:06:13 -0700
I looked at the reason for the slowdown, and it seems likely the
reason for the slowdown between 3.0.4 and 3.1 at -O0 on x86 is more
complex RTL. Not more insns (in fact, fewer insns), but more
complexity within each insn. Reload is taking twice as long to handle
fewer insns, ggc_alloc is called 30% more times, and so on.
Note my other posting today wrt. N_REGISTER_CLASSES.
On x86 from 3.0.x to 3.1 this went up from 19 to 25
That does account for the increase in reload
and regclass time.