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Compilers and LLVM


  • basic-compiler-notes contains course notes from first few lectures from coursera's course on compilers

  • vectorization contains notes on vectorization.

  • mem-tracing this has been moved to its own repository. ignore this dir.

  • spring-2014-compilers/assignment1:

    • Module pass to print source code line number as comments in LLVM IR using AssemblyAnnotationWriter class.
  • spring-2014-compilers/assignment2:

    • Function Info pass: that prints function name, argument size, number of call sites, number of basic blocks, number of instructions for a given function.
    • LocalOpts Pass: is an transform optimization pass (changes IR). It applies optimizations such as constant folding, strength reduction and algebraic identity.
  • spring-2014-compilers/assignment3:

    • dataflow.h: implements a dataflow framework with virtual methods that can be implemented to forward (reaching definitions) and backward (liveness) analysis.
    • Live: pass uses dataflow framework to print live variables above each instruction in IR (SSA form)
    • Reach: pass uses dataflow framework to print reaching variables above each instruction in IR (SSA form)
  • spring-2014-compilers/assignment4:

    • DCE: pass performs dead code elimination. It uses dataflow frameword developed in the previous assignment.
    • licm: pass that performs loop invariant code motion. It also uses above dataflow framework.

Lessons:

It would be better to implement dataflow framework using function pointers for meet and transfer functions, otherwise you can only use them once if implemented using virtual methods.

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LLVM optimization passes (DCE, LICM), compilers and stuff

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