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In the last decade, Expression Templates (ET) have gained a reputation as anefficient performance optimization tool for C++ codes. This reputation buildson several ET-based linear algebra frameworks focused on combining both elegantand high-performance C++ code. However, on closer examination the assumptionthat ETs are a performance optimization technique cannot be maintained. In thispaper we demonstrate and explain the inability of current ET-based frameworksto deliver high performance for dense and sparse linear algebra operations, andintroduce a new "smart" ET implementation that truly allows the combination ofhigh performance code with the elegance and maintainability of adomain-specific language.

Expression Templates Revisited: A Performance Analysis of the Current ET Methodology