From 0b65599015f0b51304d941ba4a14aaf0d1734341 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Fri, 20 May 2011 17:38:48 +0000
Subject: [PATCH] Revert accidental commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131739 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMISelLowering.cpp | 2 +-
 lib/Target/ARM/ARMSubtarget.cpp    | 3 ---
 lib/Target/ARM/ARMSubtarget.h      | 6 ------
 3 files changed, 1 insertion(+), 10 deletions(-)

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 2c90aa28fe7..e9a996328f8 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -1182,7 +1182,7 @@ ARMTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
   bool IsStructRet    = (Outs.empty()) ? false : Outs[0].Flags.isSRet();
   bool IsSibCall = false;
   // Temporarily disable tail calls so things don't break.
-  if (!EnableARMTailCalls && !Subtarget->supportsTailCall())
+  if (!EnableARMTailCalls)
     isTailCall = false;
   if (isTailCall) {
     // Check if it's really possible to do a tail call.
diff --git a/lib/Target/ARM/ARMSubtarget.cpp b/lib/Target/ARM/ARMSubtarget.cpp
index 0509d58c2af..c6f266b0753 100644
--- a/lib/Target/ARM/ARMSubtarget.cpp
+++ b/lib/Target/ARM/ARMSubtarget.cpp
@@ -46,7 +46,6 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
   , PostRAScheduler(false)
   , IsR9Reserved(ReserveR9)
   , UseMovt(false)
-  , SupportsTailCall(false)
   , HasFP16(false)
   , HasD16(false)
   , HasHardwareDivide(false)
@@ -154,8 +153,6 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &FS,
   else {
     IsR9Reserved = ReserveR9 | (ARMArchVersion < V6);
     UseMovt = DarwinUseMOVT && hasV6T2Ops();
-    const Triple &T = getTargetTriple();
-    SupportsTailCall = T.getOS() == Triple::IOS && !T.isOSVersionLT(5, 0);
   }
 
   if (!isThumb() || hasThumb2())
diff --git a/lib/Target/ARM/ARMSubtarget.h b/lib/Target/ARM/ARMSubtarget.h
index c1494109a45..0271c873f19 100644
--- a/lib/Target/ARM/ARMSubtarget.h
+++ b/lib/Target/ARM/ARMSubtarget.h
@@ -87,11 +87,6 @@ protected:
   /// imms (including global addresses).
   bool UseMovt;
 
-  /// SupportsTailCall - True if the OS supports tail call. The dynamic linker
-  /// must be able to synthesize call stubs for interworking between ARM and
-  /// Thumb.
-  bool SupportsTailCall;
-
   /// HasFP16 - True if subtarget supports half-precision FP (We support VFP+HF
   /// only so far)
   bool HasFP16;
@@ -222,7 +217,6 @@ protected:
   bool isR9Reserved() const { return IsR9Reserved; }
 
   bool useMovt() const { return UseMovt && hasV6T2Ops(); }
-  bool supportsTailCall() const { return SupportsTailCall; }
 
   bool allowsUnalignedMem() const { return AllowsUnalignedMem; }
 
-- 
2.34.1