From df78fcd2d6ba4fd499ead3bdea2fde83dbcecab9 Mon Sep 17 00:00:00 2001
From: Chad Rosier <mcrosier@apple.com>
Date: Sat, 25 Jun 2011 02:04:56 +0000
Subject: [PATCH] Enable tail call optimization in the presence of a byval
 (x86-32 and x86-64). <rdar://problem/9483883>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133858 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86ISelLowering.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 6c606be5912..bab15e62a27 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -2505,6 +2505,10 @@ bool MatchingStackOffset(SDValue Arg, unsigned Offset, ISD::ArgFlagsTy Flags,
     if (!FINode)
       return false;
     FI = FINode->getIndex();
+  } else if (Arg.getOpcode() == ISD::FrameIndex && Flags.isByVal()) {
+    FrameIndexSDNode *FINode = dyn_cast<FrameIndexSDNode>(Arg);
+    FI = FINode->getIndex();
+    Bytes = Flags.getByValSize();
   } else
     return false;