forked from OSchip/llvm-project
fe0e5b3e43
The IR Verifier requires that every call instruction to an inlineable function (among other things, its implementation must be visible in the translation unit) must also have !dbg metadata attached to it. When parallelizing, Polly emits calls to OpenMP runtime function out of thin air, or at least not directly derived from a bounded list of previous instruction. While we could search for instructions in the SCoP that has some debug info attached to it, there is no guarantee that we find any. Our solution is to generate a new DILocation that points to line 0 to represent optimized code. The OpenMP function implementation is usually not available in the user's translation unit, but can become visible in an LTO build. For the bug to appear, libomp must also be built with debug symbols. IMHO, the IR verifier rule is too strict. Runtime functions can also be inserted by other optimization passes, such as LoopIdiomRecognize. When inserting a call to e.g. memset, it uses the DebugLoc from a StoreInst from the unoptimized code. It is not required to have !dbg metadata attached either. Fixes #56692 |
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| README | ||
README
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.