a144fb148b
As a CFG is often structured we can simplify the steps performed during domain generation. When we push domain information we can utilize the information from a block A to build the domain of a block B, if A dominates B. When we pull domain information we can use information from a block A to build the domain of a block B if B post-dominates A. This patch implements both ideas and thereby simplifies domains that were not simplified by isl. For the FINAL basic block in test/ScopInfo/complex-successor-structure-3.ll . we used to build a universe set with 81 basic sets. Now it actually is represented as universe set. While the initial idea to utilize the graph structure depended on the dominator and post-dominator tree we can use the available region information as a coarse grained replacement. To this end we push the region entry domain to the region exit and pull it from the region entry for the region exit. Differential Revision: http://reviews.llvm.org/D18450 llvm-svn: 264789 |
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Polly.cpp |