forked from OSchip/llvm-project
6213913244
We use the branch instruction as the location at which a PHI-node write takes place, instead of the PHI-node itself. This allows us to identify the basic-block in a region statement which is on the incoming edge of the PHI-node and for which the write access was originally introduced. As a result we can, during code generation, avoid generating PHI-node write accesses for basic blocks that do not preceed the PHI node without having to look at the IR again. This change fixes a bug which was introduced in r243420, when we started to explicitly model PHI-node reads and writes, but dropped some additional checks that where still necessary during code generation to not emit PHI-node writes for basic-blocks that are not on incoming edges of the original PHI node. Compared to the code before r243420 the new code does not need to inspect the IR any more and we also do not generate multiple redundant writes. llvm-svn: 243852 |
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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.