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Add hooks for emitLeading/TrailingFence

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216232 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Robin Morisset 2014-08-21 22:09:25 +00:00
parent cf165c36ee
commit a204592582
1 changed files with 20 additions and 0 deletions
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20
include/llvm/Target/TargetLowering.h
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@ -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