Implement the local-dynamic TLS model for x86 (PR3985)
This implements codegen support for accesses to thread-local variables
using the local-dynamic model, and adds a clean-up pass so that the base
address for the TLS block can be re-used between local-dynamic access on
an execution path.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157818 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86TargetMachine.cpp b/lib/Target/X86/X86TargetMachine.cpp
index 89c3884..c066a56 100644
--- a/lib/Target/X86/X86TargetMachine.cpp
+++ b/lib/Target/X86/X86TargetMachine.cpp
@@ -147,6 +147,10 @@
// Install an instruction selector.
PM->add(createX86ISelDag(getX86TargetMachine(), getOptLevel()));
+ // For ELF, cleanup any local-dynamic TLS accesses.
+ if (getX86Subtarget().isTargetELF() && getOptLevel() != CodeGenOpt::None)
+ PM->add(createCleanupLocalDynamicTLSPass());
+
// For 32-bit, prepend instructions to set the "global base reg" for PIC.
if (!getX86Subtarget().is64Bit())
PM->add(createGlobalBaseRegPass());