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Re: patch to remove temporary clobbers in LRA
- From: Steven Bosscher <stevenb dot gcc at gmail dot com>
- To: Vladimir Makarov <vmakarov at redhat dot com>
- Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Date: Sun, 28 Oct 2012 21:11:00 +0100
- Subject: Re: patch to remove temporary clobbers in LRA
- References: <508D903F.8030208@redhat.com>
On Sun, Oct 28, 2012 at 9:06 PM, Vladimir Makarov wrote:
> Unfortunately, it does not solve the problem I mentioned. Now, LRA
> generates approximately the same # of insns and debug_insn. Moreover, two
> functions (canonicalize_values_star and set_slot_part) in var-tracking
> spending most of time have approximately the same coverage, in other words
> numbers of execution for each line are the same (differences < 1%). Still
> var-tracking after LRA spent on 20% more time than after reload. I have no
> idea what to investigate more but I'll continue my work on the problem next
> week.
Well, it may be more fruitful to see why var-tracking is so slow. The
problem existed before LRA was merged, it's just triggered more often
after the LRA merge. But the real problem is var-tracking.
Ciao!
Steven