[compiler-rt] [llvm] [AIX] PGO codegen changes for function-sections. (PR #139761)
Sean Fertile via llvm-commits
llvm-commits at lists.llvm.org
Tue May 13 09:13:41 PDT 2025
https://github.com/mandlebug created https://github.com/llvm/llvm-project/pull/139761
The existing PGO implementation creates a dependence from the profiling data symbol to the function descriptors for every function defined within the compilation unit. This forces the binder to include either all or no functions from an object file when linking a profile-generate enabled object file, which can break links that require the aggressive "include only whats used" link semantics that XCOFF provides. To remedy this we break up the profiling data symbol into per-function CSECTs by using the rename directive to emit the profd symbol for a single function to a unique CSECT, then rename it to the common name afterwards. We also have to split the counters into per-function CSECTs as they need to have a .ref relocation from the counter section which is referenced by the functions, to the profiling-data symbol which is otherwise unreferenced.
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