forked from OSchip/llvm-project
18c8c934d8
Introduce the execute_region op that is able to hold a region which it executes exactly once. The op encapsulates a CFG within itself while isolating it from the surrounding control flow. Proposal discussed here: https://llvm.discourse.group/t/introduce-std-inlined-call-op-proposal/282 execute_region enables one to inline a function without lowering out all other higher level control flow constructs (affine.for/if, scf.for/if) to the flat list of blocks / CFG form. It thus allows the benefit of transforms on higher level control flow ops available in the presence of the inlined calls. The inlined calls continue to benefit from propagation of SSA values across their top boundary. Functions won’t have to remain outlined until later than desired. Abstractions like affine execute_regions, lambdas with implicit captures could be lowered to this without first lowering out structured loops/ifs or outlining. But two potential early use cases are of: (1) an early inliner (which can inline functions by introducing execute_region ops), (2) lowering of an affine.execute_region, which cleanly maps to an scf.execute_region when going from the affine dialect to the scf dialect. Differential Revision: https://reviews.llvm.org/D75837 |
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