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User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.13) Gecko/20110103 Fedora/3.6.13-1.fc14 Firefox/3.6.13 I rebuilt atlas setting enable_native_atlas equal to 1. The configure script correctly detected support for SSE3 on my CPU (Intel Atom N550), but in the %build step (lines 220-222) sed is used to remove the SSE compiler flags in Make.inc. I think the spec file should leave these flags alone when building a native atlas. Reproducible: Always Steps to Reproduce: 1. Install source rpm on Fedora 14 i686. 2. From ~/rpmbuild/SPECS do rpmbuild -ba atlas.spec 3. Check ARCH (line 13) and ARCHDEFS (line 780) in ~/rpmbuild/BUILD/ATLAS/i386_base/Make.inc Actual Results: ARCH = PPRO32 ARCHDEFS = -DATL_OS_Linux -DATL_ARCH_UNKNOWNx86 -DATL_CPUMHZ=1000 -DATL_GAS_x8632 Expected Results: ARCH = UNKNOWNx8632SSE3 ARCHDEFS = -DATL_OS_Linux -DATL_ARCH_UNKNOWNx86 -DATL_CPUMHZ=1000 -DATL_SSE3 -DATL_SSE2 -DATL_SSE1 -DATL_GAS_x8632 Doing 'make time' confirms that the SSE compiler flags improves the performance of the atlas kernels, by as much as a factor of 4; see attachment.
Created attachment 481993 [details] Results of 'make time' This shows timing results using the original atlas.spec and using a modified spec file that keeps SSE compiler flags.
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