On Fri, Apr 5, 2013 at 9:39 PM, Ants Aasma <a...@cybertec.at> wrote: > Unless somebody tells me not to waste my time I'll go ahead and come > up with a workable patch by Monday.
And here you go. I decided to be verbose with the comments as it's easier to delete a comment to write one. I also left in a huge jumble of macros to calculate the contents of a helper var during compile time. This can easily be replaced with the calculated values once we settle on specific parameters. Currently only x86-64 is implemented. 32bit x86 would be mostly a copy-and-paste job, replacing 64bit pointer registers with 32bit ones. For other platforms the simplest way would be to use a vectorizing compiler on the generic variant. -funroll-loops -ftree-vectorize is enough on gcc. Quick bench results on the worst case workload: master no checksums: tps = 15.561848 master with checksums: tps = 1.695450 simd checksums: tps = 14.602698 Regards, Ants Aasma -- Cybertec Schönig & Schönig GmbH Gröhrmühlgasse 26 A-2700 Wiener Neustadt Web: http://www.postgresql-support.de
simd-checksums.patch
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