On Tue, Sep 11, 2012 at 02:06:49PM +0200, Roman Divacky wrote: > > > tl;dr: Clang will become the default compiler for x86 architectures on 2012-11-04 > > > Another issue with the switch, which seems to be not only not addressed, > > but even not talked about, is the performance impact of the change. I > > do not remember any measurements, whatever silly they could be, of the > > performance change by the compiler switch. We often have serious and > > argumented push-back for kernel changes that give as low as 2-3% of > > the speed hit. What are the numbers for clang change, any numbers ? > > Agreed. We should provide numbers. At least how buildworld times change > with clang compiled kernel/workd and gcc compiler kernel/world. How fast clang builds world in comparison to gcc is irrelevant. What is important is whether software built with clang functions correctly. See for example, http://math-atlas.sourceforge.net/errata.html#WhatComp Has anyone run Spec CPU2006 on i386 and amd64 FreeBSD? -- SteveReceived on Tue Sep 11 2012 - 11:24:17 UTC
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