[FastISel] Make isInTailCallPosition independent of SelectionDAG.

Break out the arguemnts required from SelectionDAG, so that this function can
also be used by FastISel.

llvm-svn: 212844

2 files changed, 5 insertions, 6 deletions

diff --git a/llvm/lib/CodeGen/Analysis.cpp b/llvm/lib/CodeGen/Analysis.cpp
index 1bdf312e46c..3740d03b62d 100644
--- a/llvm/lib/CodeGen/Analysis.cpp
+++ b/llvm/lib/CodeGen/Analysis.cpp
@@ -475,7 +475,8 @@ static bool nextRealType(SmallVectorImpl<CompositeType *> &SubTypes,
 /// between it and the return.
 ///
 /// This function only tests target-independent requirements.
-bool llvm::isInTailCallPosition(ImmutableCallSite CS, const SelectionDAG &DAG) {
+bool llvm::isInTailCallPosition(ImmutableCallSite CS, const TargetMachine &TM,
+                                const TargetLoweringBase &TLI) {
   const Instruction *I = CS.getInstruction();
   const BasicBlock *ExitBB = I->getParent();
   const TerminatorInst *Term = ExitBB->getTerminator();
@@ -490,8 +491,7 @@ bool llvm::isInTailCallPosition(ImmutableCallSite CS, const SelectionDAG &DAG) {
   // longjmp on x86), it can end up causing miscompilation that has not
   // been fully understood.
   if (!Ret &&
-      (!DAG.getTarget().Options.GuaranteedTailCallOpt ||
-       !isa<UnreachableInst>(Term)))
+      (!TM.Options.GuaranteedTailCallOpt || !isa<UnreachableInst>(Term)))
     return false;
 
   // If I will have a chain, make sure no other instruction that will have a
@@ -509,8 +509,7 @@ bool llvm::isInTailCallPosition(ImmutableCallSite CS, const SelectionDAG &DAG) {
         return false;
     }
 
-  return returnTypeIsEligibleForTailCall(ExitBB->getParent(), I, Ret,
-                                         *DAG.getTarget().getTargetLowering());
+  return returnTypeIsEligibleForTailCall(ExitBB->getParent(), I, Ret, TLI);
 }
 
 bool llvm::returnTypeIsEligibleForTailCall(const Function *F,
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 28d8e984349..f20c61a21c6 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -5490,7 +5490,7 @@ void SelectionDAGBuilder::LowerCallTo(ImmutableCallSite CS, SDValue Callee,
 
   // Check if target-independent constraints permit a tail call here.
   // Target-dependent constraints are checked within TLI->LowerCallTo.
-  if (isTailCall && !isInTailCallPosition(CS, DAG))
+  if (isTailCall && !isInTailCallPosition(CS, DAG.getTarget(), *TLI))
     isTailCall = false;
 
   TargetLowering::CallLoweringInfo CLI(DAG);