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| author | Hans Wennborg <hans@hanshq.net> | 2012-11-15 11:40:00 +0000 |
|---|---|---|
| committer | Hans Wennborg <hans@hanshq.net> | 2012-11-15 11:40:00 +0000 |
| commit | 1839858983dcbaf1808a6a37f5cd64d92981f27e (patch) | |
| tree | 1dcce5725cc713d41175088b57f33a93a3f6e8b6 /include | |
| parent | ac39a035351a20928e087617e412aa6ce510181f (diff) | |
| download | llvm-1839858983dcbaf1808a6a37f5cd64d92981f27e.tar.gz llvm-1839858983dcbaf1808a6a37f5cd64d92981f27e.tar.bz2 llvm-1839858983dcbaf1808a6a37f5cd64d92981f27e.tar.xz | |
Make GlobalOpt be conservative with TLS variables (PR14309)
For global variables that get the same value stored into them
everywhere, GlobalOpt will replace them with a constant. The problem is
that a thread-local GlobalVariable looks like one value (the address of
the TLS var), but is different between threads.
This patch introduces Constant::isThreadDependent() which returns true
for thread-local variables and constants which depend on them (e.g. a GEP
into a thread-local array), and teaches GlobalOpt not to track such
values.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168037 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include')
| -rw-r--r-- | include/llvm/Constant.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/llvm/Constant.h b/include/llvm/Constant.h index bbd1b1a6e2..b3cb449da1 100644 --- a/include/llvm/Constant.h +++ b/include/llvm/Constant.h @@ -65,6 +65,9 @@ public: /// true for things like constant expressions that could divide by zero. bool canTrap() const; + /// isThreadDependent - Return true if the value can vary between threads. + bool isThreadDependent() const; + /// isConstantUsed - Return true if the constant has users other than constant /// exprs and other dangling things. bool isConstantUsed() const; |