[PATCH] D115714: [Debugify] Limit number of processed instructions for original mode

[Nikola Tesic via Phabricator via llvm-commits]

ntesic created this revision.
ntesic added reviewers: Orlando, StephenTozer, djtodoro.
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Debugify in OriginalDebugInfo mode, does (DebugInfo) collect-before-pass & check-after-pass
for each instruction, which is pretty expensive. When used to analyze DebugInfo losses
in large projects (like LLVM), this raises the build time unacceptably.
This patch introduces a limit for the number of processed instructions.
The default value is 10000 instructions per compile unit (per pass),
which is experimentally derived, based on LLVM & binutils-gdb builds.

Additionally, the -debugify-instr-limit option could be used to specify
the level of limitation as:

- zero - sets the level to 0 (practically turns off the utility),
- unlimited - sets the level to UINT_MAX (practically turns off the limitation),
- default - sets the level to 10000 instructions.

This patch speeds up the utility 3-4 times.


https://reviews.llvm.org/D115714

Files:
  llvm/lib/Transforms/Utils/Debugify.cpp
  llvm/test/Transforms/Util/Debugify/loc-only-original-mode.ll

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