From 1c80f56268fa91f9c0c4d0a32b5d61e7b900c6d4 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Fri, 30 Mar 2012 01:24:39 +0000
Subject: ARM target should allow codegenprep to duplicate ret instructions to
 enable tailcall opt. rdar://11140249

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153717 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMISelLowering.cpp |  2 +-
 test/CodeGen/ARM/call-tc.ll        | 42 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 8abbf76ff6..d5c38d5e1b 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -1990,7 +1990,7 @@ bool ARMTargetLowering::isUsedByReturnOnly(SDNode *N) const {
 }
 
 bool ARMTargetLowering::mayBeEmittedAsTailCall(CallInst *CI) const {
-  if (!EnableARMTailCalls)
+  if (!EnableARMTailCalls && !Subtarget->supportsTailCall())
     return false;
 
   if (!CI->isTailCall())
diff --git a/test/CodeGen/ARM/call-tc.ll b/test/CodeGen/ARM/call-tc.ll
index be3e105586..7d245003ae 100644
--- a/test/CodeGen/ARM/call-tc.ll
+++ b/test/CodeGen/ARM/call-tc.ll
@@ -96,3 +96,45 @@ bb:
   tail call void @foo() nounwind
   ret void
 }
+
+; Make sure codegenprep is duplicating ret instructions to enable tail calls.
+; rdar://11140249
+define i32 @t8(i32 %x) nounwind ssp {
+entry:
+; CHECKT2D: t8:
+; CHECKT2D-NOT: push
+; CHECKT2D-NOT
+  %and = and i32 %x, 1
+  %tobool = icmp eq i32 %and, 0
+  br i1 %tobool, label %if.end, label %if.then
+
+if.then:                                          ; preds = %entry
+; CHECKT2D: bne.w _a
+  %call = tail call i32 @a(i32 %x) nounwind
+  br label %return
+
+if.end:                                           ; preds = %entry
+  %and1 = and i32 %x, 2
+  %tobool2 = icmp eq i32 %and1, 0
+  br i1 %tobool2, label %if.end5, label %if.then3
+
+if.then3:                                         ; preds = %if.end
+; CHECKT2D: bne.w _b
+  %call4 = tail call i32 @b(i32 %x) nounwind
+  br label %return
+
+if.end5:                                          ; preds = %if.end
+; CHECKT2D: b.w _c
+  %call6 = tail call i32 @c(i32 %x) nounwind
+  br label %return
+
+return:                                           ; preds = %if.end5, %if.then3, %if.then
+  %retval.0 = phi i32 [ %call, %if.then ], [ %call4, %if.then3 ], [ %call6, %if.end5 ]
+  ret i32 %retval.0
+}
+
+declare i32 @a(i32)
+
+declare i32 @b(i32)
+
+declare i32 @c(i32)
-- 
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