This is a medium-ish article I wrote up about the current state of the x86 SSE .td files (sans Bruno's ongoing work on AVX). While some of the code snippets are a little bit out-of-date (owing to said work by Bruno and others), the basic concepts still apply. Essentially, the article outlines several places in the current .td files that have redundancy and how that redundancy has led to some missed instruction patterns (i.e. the current spec is not orthogonal). This is the analysis I went through when I determined a refactoring on the x86 SSE/MMX/AVX .td files might be useful, both to improve maintainability and to fill out the spec so it is more orthogonal. Take a read a let me know what you think. I have a refactored SIMD spec that I'm cleaning up at the moment for better presentation. I will post that as soon as I can to give some concrete examples of what I have here. Let the discussion begin! -Dave -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: AVX.txt URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20100713/2dd8fae1/attachment.txt>