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Re: K6 patches for review
- To: law at cygnus dot com
- Subject: Re: K6 patches for review
- From: Joern Rennecke <amylaar at cygnus dot co dot uk>
- Date: Mon, 24 Aug 1998 19:24:26 +0100 (BST)
- Cc: davem at dm dot cobaltmicro dot com, jfc at tiac dot net, egcs at cygnus dot com
> > scheme, now for FPU code Haifa gets quad issue often. ADJUST_COST is
> > yet another hack that doesn't work at all...
> I'd argue with "doesn't work at all...". It's value as diminished
> over time as superscalar machines have become popular.
It is crucial to note that while you can adjust a cost downwards, adjusting
it upwards doesn't work. So if you have an exception where a cost is higher,
you have to set the default cost to the higher value, and use ADJUST_COST
to lower it in the non-exceptional case.