From 513869453be688d772df7364c141a981f50c6d56 Mon Sep 17 00:00:00 2001
From: Nick Lewycky <nicholas@mxc.ca>
Date: Sun, 27 Sep 2009 07:55:32 +0000
Subject: [PATCH] Remove dead code from this function and optimize. Update its
 corresponding LangRef entry too.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82890 91177308-0d34-0410-b5e6-96231b3b80d8
---
 docs/LangRef.html   | 10 +++++-----
 lib/VMCore/Type.cpp | 24 +++++-------------------
 2 files changed, 10 insertions(+), 24 deletions(-)

diff --git a/docs/LangRef.html b/docs/LangRef.html
index 935625dbfaa..6f5fbb3f35b 100644
--- a/docs/LangRef.html
+++ b/docs/LangRef.html
@@ -1592,7 +1592,7 @@ Classifications</a> </div>
 
 <h5>Syntax:</h5>
 <pre>
-  &lt;returntype list&gt; (&lt;parameter list&gt;)
+  &lt;returntype&gt; (&lt;parameter list&gt;)
 </pre>
 
 <p>...where '<tt>&lt;parameter list&gt;</tt>' is a comma-separated list of type
@@ -1600,8 +1600,8 @@ Classifications</a> </div>
    which indicates that the function takes a variable number of arguments.
    Variable argument functions can access their arguments with
    the <a href="#int_varargs">variable argument handling intrinsic</a>
-   functions.  '<tt>&lt;returntype list&gt;</tt>' is a comma-separated list of
-   <a href="#t_firstclass">first class</a> type specifiers.</p>
+   functions.  '<tt>&lt;returntype&gt;</tt>' is a any type except
+   <a href="#t_label">label</a> and <a href="#t_metadata">metadata</a>.</p>
 
 <h5>Examples:</h5>
 <table class="layout">
@@ -1626,8 +1626,8 @@ Classifications</a> </div>
     </td>
   </tr><tr class="layout">
     <td class="left"><tt>{i32, i32} (i32)</tt></td>
-    <td class="left">A function taking an <tt>i32</tt>, returning two 
-        <tt>i32</tt> values as an aggregate of type <tt>{ i32, i32 }</tt>
+    <td class="left">A function taking an <tt>i32</tt>, returning a
+        <a href="#t_struct">structure</a> containing two <tt>i32</tt> values
     </td>
   </tr>
 </table>
diff --git a/lib/VMCore/Type.cpp b/lib/VMCore/Type.cpp
index 0883cc304b1..da53800ad7e 100644
--- a/lib/VMCore/Type.cpp
+++ b/lib/VMCore/Type.cpp
@@ -365,25 +365,11 @@ const IntegerType *Type::getInt64Ty(LLVMContext &C) {
 /// isValidReturnType - Return true if the specified type is valid as a return
 /// type.
 bool FunctionType::isValidReturnType(const Type *RetTy) {
-  if (RetTy->isFirstClassType()) {
-    if (const PointerType *PTy = dyn_cast<PointerType>(RetTy))
-      return PTy->getElementType()->getTypeID() != MetadataTyID;
-    return true;
-  }
-  if (RetTy->getTypeID() == VoidTyID || RetTy->getTypeID() == MetadataTyID ||
-      isa<OpaqueType>(RetTy))
-    return true;
-  
-  // If this is a multiple return case, verify that each return is a first class
-  // value and that there is at least one value.
-  const StructType *SRetTy = dyn_cast<StructType>(RetTy);
-  if (SRetTy == 0 || SRetTy->getNumElements() == 0)
-    return false;
-  
-  for (unsigned i = 0, e = SRetTy->getNumElements(); i != e; ++i)
-    if (!SRetTy->getElementType(i)->isFirstClassType())
-      return false;
-  return true;
+  if (const PointerType *PTy = dyn_cast<PointerType>(RetTy))
+    return PTy->getElementType()->getTypeID() != MetadataTyID;
+
+  return RetTy->getTypeID() != LabelTyID &&
+         RetTy->getTypeID() != MetadataTyID;
 }
 
 /// isValidArgumentType - Return true if the specified type is valid as an