[llvm] r216232 - Add hooks for emitLeading/TrailingFence
Robin Morisset
morisset at google.com
Thu Aug 21 15:09:26 PDT 2014
Author: morisset
Date: Thu Aug 21 17:09:25 2014
New Revision: 216232
URL: http://llvm.org/viewvc/llvm-project?rev=216232&view=rev
Log:
Add hooks for emitLeading/TrailingFence
Modified:
llvm/trunk/include/llvm/Target/TargetLowering.h
Modified: llvm/trunk/include/llvm/Target/TargetLowering.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Target/TargetLowering.h?rev=216232&r1=216231&r2=216232&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Target/TargetLowering.h (original)
+++ llvm/trunk/include/llvm/Target/TargetLowering.h Thu Aug 21 17:09:25 2014
@@ -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
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