https://bugs.llvm.org/show_bug.cgi?id=36483
Bug ID: 36483
Summary: cfi-icall broken for available_externally functions
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Interprocedural Optimizations
Assignee: unassignedb...@nondot.org
Reporter: v...@tsyrklevich.net
CC: llvm-bugs@lists.llvm.org
A change [1] to ThinLTO to mark non-prevailing values as dead (and later drop
dead symbols) has broken how LowerTypeTests handles available_externally
functions. The LowerTypeTests pass uses liveness to determine which functions
to emit cfi-icall thunks for to avoid avoid emitting thunks for unused
functions. Because of the change in [1], available_externally functions are
marked not live and LowerTypeTests does not emit thunks for them even when they
are actually used.
[1] https://reviews.llvm.org/D42107
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