LLVM description (for example, here says it is a framework for lifelong program analysis and transformation.
What does lifelong mean in this context?
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“Such lifelong code optimization techniques encompass interprocedural optimizations performed at link-time (to preserve the benefits of separate compilation), machine-dependent optimizations at install time on each system, dynamic optimization at runtime, and profile-guided optimization between runs (‘idle time’) using profile information collected from the end-user.”
This was extracted from the second paragraph of this paper: http://llvm.org/pubs/2004-01-30-CGO-LLVM.pdf