I thought we were doing good just using $target_cpu in our aclocal.m4 to detect x86_64... no idea how to check for specific instruction sets.
-J On Fri, Apr 4, 2008 at 10:36 PM, Roy Stogner <[EMAIL PROTECTED]> wrote: > > We currently use icc -xP, > > "Can generate SSE3, SSE2, and SSE instructions for Intel processors, > and it can optimize for processors based on Intel(R) Core(TM) > microarchitecture and Intel NetBurst(R) microarchitecture, like > Intel(R) Core(TM) Duo processors, Pentium(R) 4 processors with SSE3, > and Intel(R) Xeon(R) pro- cessors with SSE3. This is the default on > Mac OS X systems using IA-32 architecture." > > But what we apparently need on Opteron-based systems like Ranger is > icc -xW: > > "Can generate SSE2 and SSE instructions, and it can optimize for > Intel(R) Pentium(R) 4 processors and Intel(R) Xeon(R) processors > with SSE2. This is the default on Linux systems using Intel(R) 64 > architecture. This option is the same as specifying > -march=pentium4." > > I could just switch the optimizations in our aclocal.m4 file to use > the more conservative -xW. It's better for us to always work and > sometimes use suboptimal compiler flags than to sometimes work and > sometimes use broken compiler flags. > > Alternatively, it would be nice if we could autodetect what we're > running on at configure time. I don't suppose there's any > cross-platform way to do "grep sse3 /proc/cpuinfo"? > > Finally, it looks like icc 10 has the option to generate multiple code > paths; we could use "-xW -axP" to use SSE3 where it's supported and > fall back to SSE2-only otherwise. This sounds like a way to bload > library and executable size, though. > > Any preferences? > --- > Roy > > ------------------------------------------------------------------------- > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > Register now and save $200. Hurry, offer ends at 11:59 p.m., > Monday, April 7! Use priority code J8TLD2. > > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > _______________________________________________ > Libmesh-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/libmesh-devel > ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Register now and save $200. Hurry, offer ends at 11:59 p.m., Monday, April 7! Use priority code J8TLD2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Libmesh-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-devel
