[all-commits] [llvm/llvm-project] 23c64b: [PGO] Preserve analysis results when nothing was i...

[Pavel Samolysov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 23c64beeccc03c6a8329314ecd75864e09bb6d97
      https://github.com/llvm/llvm-project/commit/23c64beeccc03c6a8329314ecd75864e09bb6d97
  Author: Pavel Samolysov <samolisov at gmail.com>
  Date:   2024-10-12 (Sat, 12 Oct 2024)

  Changed paths:
    M llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp
    M llvm/unittests/Transforms/Instrumentation/PGOInstrumentationTest.cpp

  Log Message:
  -----------
  [PGO] Preserve analysis results when nothing was instrumented (#93421)

The `PGOInstrumentationGen` pass should preserve all analysis results
when nothing was actually instrumented. Currently, only modules that
contain at least a single function definition are instrumented. When a
module contains only function declarations and, optionally, global
variable definitions (a module for the regular-LTO phase for thin-LTO
when LTOUnit splitting is enabled, for example), such module is not
instrumented (yet?) and there is no reason to invalidate any analysis
results.

NFC.



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