2014-02-03 Felipe Sateler <fsate...@debian.org>: > On Mon, Feb 3, 2014 at 1:07 PM, Reinhard Tartler <siret...@gmail.com> > wrote: > > > > Please note that Jaromir proposed to use the following flags: > > > > ifeq ($(DEB_HOST_ARCH_CPU),amd64) > > CFLAGS += -msse -msse2 -mfpmath=sse > > endif > > > > > > None of them fall in the "mtune" category, that is, none of them are > > "safe" to use without further precaution measures! > > Hmm, I'm now not sure if they help and are harmless. If sse is > required by the amd64 spec, then gcc should enable it by default (in > -O2?). I can't say if the previous is true. Perhaps we should take > this to a more knowledgeable audience? debian-devel or debian-gcc > lists would be better, perhaps. > > The docs do suggest they are redundant in amd64[1]: > > [1] > http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/i386-and-x86_002d64-Options.html >
Please go ahead ... It looks like debian-devel would be right place. It sound strange that sse is redundant in amd64. Some time ago I played with sse optimization flags and packages build with and without them got 30-40% difference in performance in my cases. Would be great to make it clear. mira
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