[PATCH] Do not use isel on P7 and P8

[hfinkel at anl.gov]

I've not run benchmarks on the `P8`, only the `P7` (I did 20 test suite runs in each configuration today), but I think that the situation is more complicated than you imply...

With this patch I see (negative is speedup):

External/SPEC/CFP2006/444.namd/444.namd
	-29.3699% +/- 19.5658%
External/SPEC/CINT2006/483.xalancbmk/483.xalancbmk
	2.46854% +/- 0.541648%
MultiSource/Benchmarks/McCat/04-bisect/bisect
	15.5624% +/- 5.32078%
MultiSource/Benchmarks/mediabench/adpcm/rawdaudio/rawdaudio
	31.4063% +/- 19.7579%

So the namd speedup is nice, but essentially everything else is a slowdown. I think that we need a more in-depth analysis of what's going on here.


http://reviews.llvm.org/D8260

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