From 1430ef134d36888b99d2e6fedd2b025882593538 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Fri, 6 May 2005 06:46:58 +0000
Subject: [PATCH] preserve the tail marker

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21734 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/ExprTypeConvert.cpp             | 2 ++
 lib/Transforms/IPO/ArgumentPromotion.cpp       | 2 ++
 lib/Transforms/IPO/DeadArgumentElimination.cpp | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/lib/Transforms/ExprTypeConvert.cpp b/lib/Transforms/ExprTypeConvert.cpp
index f43390da836..a022461d333 100644
--- a/lib/Transforms/ExprTypeConvert.cpp
+++ b/lib/Transforms/ExprTypeConvert.cpp
@@ -523,6 +523,8 @@ Value *llvm::ConvertExpressionToType(Value *V, const Type *Ty,
     Res = new CallInst(Constant::getNullValue(NewPTy),
                        std::vector<Value*>(I->op_begin()+1, I->op_end()),
                        Name);
+    if (cast<CallInst>(I)->isTailCall())
+      cast<CallInst>(Res)->setTailCall();
     VMC.ExprMap[I] = Res;
     Res->setOperand(0, ConvertExpressionToType(I->getOperand(0),NewPTy,VMC,TD));
     break;
diff --git a/lib/Transforms/IPO/ArgumentPromotion.cpp b/lib/Transforms/IPO/ArgumentPromotion.cpp
index 028fda9aebe..fd5a5d0215f 100644
--- a/lib/Transforms/IPO/ArgumentPromotion.cpp
+++ b/lib/Transforms/IPO/ArgumentPromotion.cpp
@@ -443,6 +443,8 @@ Function *ArgPromotion::DoPromotion(Function *F,
                            Args, "", Call);
     } else {
       New = new CallInst(NF, Args, "", Call);
+      if (cast<CallInst>(Call)->isTailCall())
+        cast<CallInst>(New)->setTailCall();
     }
     Args.clear();
 
diff --git a/lib/Transforms/IPO/DeadArgumentElimination.cpp b/lib/Transforms/IPO/DeadArgumentElimination.cpp
index 3a2a5f08a84..2dbc5c3169a 100644
--- a/lib/Transforms/IPO/DeadArgumentElimination.cpp
+++ b/lib/Transforms/IPO/DeadArgumentElimination.cpp
@@ -430,6 +430,8 @@ void DAE::RemoveDeadArgumentsFromFunction(Function *F) {
                            Args, "", Call);
     } else {
       New = new CallInst(NF, Args, "", Call);
+      if (cast<CallInst>(Call)->isTailCall())
+        cast<CallInst>(New)->setTailCall();
     }
     Args.clear();
 
-- 
2.34.1