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As part of the "RemoveDIs" project, BasicBlock::iterator now carries a debug-info bit that's needed when getFirstNonPHI and similar feed into instruction insertion positions. Call-sites where that's necessary were updated a year ago; but to ensure some type safety however, we'd like to have all calls to getFirstNonPHI use the iterator-returning version. This patch changes a bunch of call-sites calling getFirstNonPHI to use getFirstNonPHIIt, which returns an iterator. All these call sites are where it's obviously safe to fetch the iterator then dereference it. A follow-up patch will contain less-obviously-safe changes. We'll eventually deprecate and remove the instruction-pointer getFirstNonPHI, but not before adding concise documentation of what considerations are needed (very few). --------- Co-authored-by: Stephen Tozer <Melamoto@gmail.com>
Polly - Polyhedral optimizations for LLVM ----------------------------------------- http://polly.llvm.org/ Polly uses a mathematical representation, the polyhedral model, to represent and transform loops and other control flow structures. Using an abstract representation it is possible to reason about transformations in a more general way and to use highly optimized linear programming libraries to figure out the optimal loop structure. These transformations can be used to do constant propagation through arrays, remove dead loop iterations, optimize loops for cache locality, optimize arrays, apply advanced automatic parallelization, drive vectorization, or they can be used to do software pipelining.