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by david-given
4151 days ago
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The LLVM DSL engine is really annoying to use, mainly because the pattern matching engine is pretty simple, and it's possible to express patterns in the DSL language which the pattern matching engine is unable to actually match. Until you know where the limits are it's really frustrating; you write a pattern which should work and the compiler blows stack or produces an impenetrable internal error because the pattern matcher has given up or gone into a working loop. A large part of any LLVM backend is actually custom C++ code for matching and expanding patterns which the pattern matcher either can't or is unwilling to do (e.g. custom backend-specific DAG nodes). I direct you at this file: https://github.com/llvm-mirror/llvm/blob/master/lib/Target/X... github will give you a warning before loading it because that single C++ source file is over a megabyte... |
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