[PATCH] Add hooks for emitLeading/TrailingFence in TargetLowering
Robin Morisset
morisset at google.com
Thu Aug 21 14:14:29 PDT 2014
Apply jfb suggestions.
http://reviews.llvm.org/D4959
Files:
include/llvm/Target/TargetLowering.h
Index: include/llvm/Target/TargetLowering.h
===================================================================
--- include/llvm/Target/TargetLowering.h
+++ include/llvm/Target/TargetLowering.h
@@ -956,6 +956,26 @@
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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