Move isInTailCallPosition out of SelectionDAGBuilder, as it isn't

SelectionDAG-specific.

llvm-svn: 101801

1 files changed, 10 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.h b/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.h
index 34c8da62f7f..0d9af1a9bf3 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.h
+++ b/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.h
@@ -24,6 +24,7 @@
 #endif
 #include "llvm/CodeGen/ValueTypes.h"
 #include "llvm/CodeGen/ISDOpcodes.h"
+#include "llvm/Support/CallSite.h"
 #include <vector>
 
 namespace llvm {
@@ -166,6 +167,15 @@ ISD::CondCode getFCmpCondCode(FCmpInst::Predicate Pred);
 ///
 ISD::CondCode getICmpCondCode(ICmpInst::Predicate Pred);
 
+/// Test if the given instruction is in a position to be optimized
+/// with a tail-call. This roughly means that it's in a block with
+/// a return and there's nothing that needs to be scheduled
+/// between it and the return.
+///
+/// This function only tests target-independent requirements.
+bool isInTailCallPosition(ImmutableCallSite CS, Attributes CalleeRetAttr,
+                          const TargetLowering &TLI);
+
 } // end namespace llvm
 
 #endif