[PATCH] D51749: [GlobalISel] Lower dbg.declare into indirect DBG_VALUE

[Adrian Prantl via Phabricator via llvm-commits]

aprantl added a comment.

Note that strictly speaking a dbg.declare is not 100% the same as an indirect DBG_VALUE. A dbg.declare declares a stack slot for a variable, and specifically has a lifetime valid for the entire lexical scope of that variable, whereas the lifetime of a DBG_VALUE only lasts until the next DBG_VALUE for the same variable, the end of the basic block (except where LiveDebugValues can prove it doesn't), or until the value the DBG_Value is pointing to is clobbered, whichever happens first.

Because of this the other instruction selectors enter dbg.declares into the MMI sidetable, which is a map of stack slots.


Repository:
  rL LLVM

https://reviews.llvm.org/D51749