Add a new subtarget hook for whether or not we'd like to enable

the atomic load linked expander pass to run for a particular
subtarget. This requires a check of the subtarget and so save
the TargetMachine rather than only TargetLoweringInfo and update
all callers.

llvm-svn: 211314

1 files changed, 6 insertions, 7 deletions

diff --git a/llvm/lib/Target/ARM/ARMTargetMachine.cpp b/llvm/lib/Target/ARM/ARMTargetMachine.cpp
index 7a3836a..434d3b03 100644
--- a/llvm/lib/Target/ARM/ARMTargetMachine.cpp
+++ b/llvm/lib/Target/ARM/ARMTargetMachine.cpp
@@ -171,16 +171,15 @@ TargetPassConfig *ARMBaseTargetMachine::createPassConfig(PassManagerBase &PM) {
 }
 
 void ARMPassConfig::addIRPasses() {
-  const ARMSubtarget *Subtarget = &getARMSubtarget();
-  if (Subtarget->hasAnyDataBarrier() && !Subtarget->isThumb1Only()) {
-    addPass(createAtomicExpandLoadLinkedPass(TM));
+  addPass(createAtomicExpandLoadLinkedPass(TM));
 
-    // Cmpxchg instructions are often used with a subsequent comparison to
-    // determine whether it succeeded. We can exploit existing control-flow in
-    // ldrex/strex loops to simplify this, but it needs tidying up.
+  // Cmpxchg instructions are often used with a subsequent comparison to
+  // determine whether it succeeded. We can exploit existing control-flow in
+  // ldrex/strex loops to simplify this, but it needs tidying up.
+  const ARMSubtarget *Subtarget = &getARMSubtarget();
+  if (Subtarget->hasAnyDataBarrier() && !Subtarget->isThumb1Only())
     if (TM->getOptLevel() != CodeGenOpt::None && EnableAtomicTidy)
       addPass(createCFGSimplificationPass());
-  }
 
   TargetPassConfig::addIRPasses();
 }