Date: Sun, 10 Feb 2013 11:00:48 -0800 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Anton Shterenlikht <mexas@bristol.ac.uk> Cc: freebsd-current@freebsd.org, bsam@passap.ru Subject: Re: 7+ days of dogfood Message-ID: <20130210190048.GA77774@troutmask.apl.washington.edu> In-Reply-To: <201302101851.r1AIpNWs055658@mech-cluster241.men.bris.ac.uk> References: <20130210164424.GA77092@troutmask.apl.washington.edu> <201302101851.r1AIpNWs055658@mech-cluster241.men.bris.ac.uk>
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On Sun, Feb 10, 2013 at 06:51:23PM +0000, Anton Shterenlikht wrote: > Date: Sun, 10 Feb 2013 08:44:24 -0800 > From: Steve Kargl <sgk@troutmask.apl.washington.edu> > To: Boris Samorodov <bsam@passap.ru> > Subject: Re: 7+ days of dogfood > > > > FFLAGS = -O2 -pipe -march=native -mtune=native > > > > I don't like using "=" for FLAGS at make.conf... > > > > > FFLAGS+= -funroll-loops -ftree-vectorize > > > > ... as well as defaults overriding. > > > > FFLAGS are the options used while compiling Fortran. Having > spent years contributing to and testing gfortran, I am fairly > comfortable with these options. > > Do you recommend these FFLAGS settings to all > users of gfortran (via lang/gcc4x)? > Yes. > For example, I use blas, lapack, slatec, atlas, etc. > Should I use these FFLAGS too? Without knowing what options you currently use, I cannot make a concrete recommendation other than I've extensive tested the above options with my own codes and the Polyhedron testsuite. Oh, I do recommend that one should avoid -ffast-math (unless one really understands what it actually does). -- Steve
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