From: Evan Cheng <evan.cheng@apple.com>
Date: Tue, 26 Jan 2010 23:13:04 +0000 (+0000)
Subject: Allow some automatic tailcall optimization without changing ABI.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=11e679324b693125a98d865fe3e9fc9b2a9e5d22;p=oota-llvm.git

Allow some automatic tailcall optimization without changing ABI.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94611 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index dddf3851637..55dc460cb40 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -5122,9 +5122,7 @@ void SelectionDAGBuilder::visitCall(CallInst &I) {
 
   // Check if we can potentially perform a tail call. More detailed checking is
   // be done within LowerCallTo, after more information about the call is known.
-  bool isTailCall = PerformTailCallOpt && I.isTailCall();
-
-  LowerCallTo(&I, Callee, isTailCall);
+  LowerCallTo(&I, Callee, I.isTailCall());
 }
 
 /// getCopyFromRegs - Emit a series of CopyFromReg nodes that copies from
@@ -6118,9 +6116,6 @@ TargetLowering::LowerCallTo(SDValue Chain, const Type *RetTy,
                             SDValue Callee,
                             ArgListTy &Args, SelectionDAG &DAG, DebugLoc dl,
                             unsigned Order) {
-  assert((!isTailCall || PerformTailCallOpt) &&
-         "isTailCall set when tail-call optimizations are disabled!");
-
   // Handle all of the outgoing arguments.
   SmallVector<ISD::OutputArg, 32> Outs;
   for (unsigned i = 0, e = Args.size(); i != e; ++i) {