It is possible for optimizations to create SSA code which violates
the dominance property in unreachable blocks. Equivalently, dominance
computed using normal mechanisms is undefined in unreachable blocks.
See discussion here: https://llvm.discourse.group/t/rfc-allowing-dialects-to-relax-the-ssa-dominance-condition/833/51
This patch only checks the dominance condition inside blocks which are
reachable from the the entry block of their region. Note that the
dominance conditions of regions contained in an unreachable block are
still checked.
Differential Revision: https://reviews.llvm.org/D79922
These libraries are distinct from other things in Analysis in that they
operate only on core IR concepts. This also simplifies dependencies
so that Dialect -> Analysis -> Parser -> IR. Previously, the parser depended
on portions of the the Analysis directory as well, which sometimes
caused issues with the way the cmake makefile generator discovers
dependencies on generated files during compilation.
Differential Revision: https://reviews.llvm.org/D79240
Stephen Neuendorffer