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| author | Wolfgang Pieb <wolfgang_pieb@playstation.sony.com> | 2023-02-06 13:50:37 -0800 |
|---|---|---|
| committer | Wolfgang Pieb <wolfgang_pieb@playstation.sony.com> | 2023-02-08 10:34:56 -0800 |
| commit | 5d07e0448e38d4be0cc7b1079d72b5e3644e941c (patch) | |
| tree | f98ec36c2a5f4df3a9ee87516335f8a72f206769 /llvm/lib/Transforms/Utils/Local.cpp | |
| parent | 66b8d2bb71298cf3f406593464c6d729b7817f51 (diff) | |
| download | llvm-5d07e0448e38d4be0cc7b1079d72b5e3644e941c.zip llvm-5d07e0448e38d4be0cc7b1079d72b5e3644e941c.tar.gz llvm-5d07e0448e38d4be0cc7b1079d72b5e3644e941c.tar.bz2 | |
[TLS]: Clamp the alignment of TLS global variables if required by the target
Adding a module flag 'MaxTLSAlign' describing the maximum alignment a global TLS
variable can have. Optimizers are prevented from increasing the alignment of such
variables beyond this threshold.
Reviewed By: probinson
Differential Revision: https://reviews.llvm.org/D140123
Diffstat (limited to 'llvm/lib/Transforms/Utils/Local.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Utils/Local.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp index 624907a..ddef654 100644 --- a/llvm/lib/Transforms/Utils/Local.cpp +++ b/llvm/lib/Transforms/Utils/Local.cpp @@ -1423,6 +1423,12 @@ static Align tryEnforceAlignment(Value *V, Align PrefAlign, if (!GO->canIncreaseAlignment()) return CurrentAlign; + if (GO->isThreadLocal()) { + unsigned MaxTLSAlign = GO->getParent()->getMaxTLSAlignment() / CHAR_BIT; + if (MaxTLSAlign && PrefAlign > Align(MaxTLSAlign)) + PrefAlign = Align(MaxTLSAlign); + } + GO->setAlignment(PrefAlign); return PrefAlign; } |