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| author | Philip Reames <listmail@philipreames.com> | 2021-08-02 10:43:56 -0700 |
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| committer | Philip Reames <listmail@philipreames.com> | 2021-08-02 10:44:56 -0700 |
| commit | ebc4c4e3b060ebd92a45a590818515c4cecb279f (patch) | |
| tree | e26f8146628cec48c3cd4bf888e59cae626f32a0 /llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp | |
| parent | c4a65434d894ca6f8ba1dcf338824b369c67f01b (diff) | |
| download | llvm-ebc4c4e3b060ebd92a45a590818515c4cecb279f.zip llvm-ebc4c4e3b060ebd92a45a590818515c4cecb279f.tar.gz llvm-ebc4c4e3b060ebd92a45a590818515c4cecb279f.tar.bz2 | |
[unroll] Add clarifying comment
The option to not preserve LCSSA is in fact not tested at all in upstream. I was tempted to just remove the code entirely, but realized I didn't need to for my actual goal.
Diffstat (limited to 'llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp b/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp index 6749d3db..cb538fd 100644 --- a/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp +++ b/llvm/lib/Transforms/Utils/LoopUnrollRuntime.cpp @@ -436,6 +436,7 @@ static bool canSafelyUnrollMultiExitLoop(Loop *L, BasicBlock *LatchExit, // loop. Check for these below. // We rely on LCSSA form being preserved when the exit blocks are transformed. + // (Note that only an off-by-default mode of the old PM disables PreserveLCCA.) if (!PreserveLCSSA) return false; |