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Re: [PATCH][RFC] Move IVOPTs closer to RTL expansion

On Wed, 11 Sep 2013, Pat Haugen wrote:

> On 09/04/2013 04:20 AM, Richard Biener wrote:
> > Any help with benchmarking this on targets other than x86_64
> > is appreciated (I'll re-do x86_64).
> > 
> I ran CPU2000 and CPU2006 on PowerPC comparing the patch. CPU2000 had 3
> benchmarks degrade in the 4%-6%range (, 168.wupwise, 173.applu).CPU2006
> showed one benchmark, 410.bwaves, degrading 9%.I have dug into applu/bwaves
> and saw nothing directly attributable to your patch, degradations looked to be
> caused by idioms/oddities of the PowerPC architecture related to minor
> scheduling differences and/or data location.

Ok, I won't pursue the patch further at the moment unless a compelling
reason comes around.  The idea I had back in time I proposed this
first was that we'd like to expose the effects of PROMOTE_MODE
to IVOPTs which would be easiest if the GIMPLE IL would be lowered
(we may be better optimizing required truncations for example
by VRP).  Of course I didn't get around to playing with this
(mainly because x86 doesn't care ...).

Thanks for doing the measurement,

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