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...y is a register pressure set? Both [Quentin Colombet](http://lists.llvm.org/pipermail/llvm-dev/2016-May/100004.html) and [Andrew Trick](http://lists.llvm.org/pipermail/llvm-dev/2016-May/100019.html) have answers for us. ## LLVM commits * New optimisations covering checked arithmetic were added. [r271152](http://reviews.llvm.org/rL271152), [r271153](http://reviews.llvm.org/rL271153). * Advanced unrolling analysis is now enabled by default. [r270478](http://reviews.llvm.org/rL270478). * The initial version of a new chapter to the 'Kaleidoscope' tutorial has been committed. This describes h...