From 26b808922b78a1962ed8c8976c95effcea4b5058 Mon Sep 17 00:00:00 2001 From: Robin Morisset Date: Thu, 21 Aug 2014 22:09:25 +0000 Subject: [PATCH] Add hooks for emitLeading/TrailingFence llvm-svn: 216232 --- llvm/include/llvm/Target/TargetLowering.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/llvm/include/llvm/Target/TargetLowering.h b/llvm/include/llvm/Target/TargetLowering.h index 3bcc71b706a0..b1cac5a72e45 100644 --- a/llvm/include/llvm/Target/TargetLowering.h +++ b/llvm/include/llvm/Target/TargetLowering.h @@ -956,6 +956,26 @@ public: llvm_unreachable("Store conditional unimplemented on this target"); } + /// Inserts in the IR a target-specific intrinsic specifying a fence. + /// It is called by AtomicExpandPass before expanding an + /// AtomicRMW/AtomicCmpXchg/AtomicStore/AtomicLoad. + /// RMW and CmpXchg set both IsStore and IsLoad to true. + /// Backends with !getInsertFencesForAtomic() should keep a no-op here + virtual void emitLeadingFence(IRBuilder<> &Builder, AtomicOrdering Ord, + bool IsStore, bool IsLoad) const { + assert(!getInsertFencesForAtomic()); + } + + /// Inserts in the IR a target-specific intrinsic specifying a fence. + /// It is called by AtomicExpandPass after expanding an + /// AtomicRMW/AtomicCmpXchg/AtomicStore/AtomicLoad. + /// RMW and CmpXchg set both IsStore and IsLoad to true. + /// Backends with !getInsertFencesForAtomic() should keep a no-op here + virtual void emitTrailingFence(IRBuilder<> &Builder, AtomicOrdering Ord, + bool IsStore, bool IsLoad) const { + assert(!getInsertFencesForAtomic()); + } + /// Return true if the given (atomic) instruction should be expanded by the /// IR-level AtomicExpand pass into a loop involving /// load-linked/store-conditional pairs. Atomic stores will be expanded in the