Merge r168037 from trunk:

  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/branches/release_32@168192 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 0 deletions

diff --git a/include/llvm/Constant.h b/include/llvm/Constant.h
index 7fecf4c7b4..0ddd1db6c0 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;