diff --git a/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp b/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
index fe5937e..65c36c1 100644
--- a/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
+++ b/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
@@ -59,9 +59,7 @@
 static bool isOnlyUsedInEntryBlock(const Argument *A, bool EnableFastISel) {
   // With FastISel active, we may be splitting blocks, so force creation
   // of virtual registers for all non-dead arguments.
-  // Don't force virtual registers for byval arguments though, because
-  // fast-isel can't handle those in all cases.
-  if (EnableFastISel && !A->hasByValAttr())
+  if (EnableFastISel)
     return A->use_empty();
 
   const BasicBlock *Entry = A->getParent()->begin();
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 4fc2805..f48fdfc 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -732,31 +732,15 @@
     BasicBlock::const_iterator BI = Begin;
 
     // Lower any arguments needed in this block if this is the entry block.
-    bool SuppressFastISel = false;
-    if (LLVMBB == &Fn.getEntryBlock()) {
+    if (LLVMBB == &Fn.getEntryBlock())
       LowerArguments(LLVMBB);
 
-      // If any of the arguments has the byval attribute, forgo
-      // fast-isel in the entry block.
-      if (FastIS) {
-        unsigned j = 1;
-        for (Function::const_arg_iterator I = Fn.arg_begin(), E = Fn.arg_end();
-             I != E; ++I, ++j)
-          if (Fn.paramHasAttr(j, Attribute::ByVal)) {
-            if (EnableFastISelVerbose || EnableFastISelAbort)
-              dbgs() << "FastISel skips entry block due to byval argument\n";
-            SuppressFastISel = true;
-            break;
-          }
-      }
-    }
-
     // Setup an EH landing-pad block.
     if (BB->isLandingPad())
       PrepareEHLandingPad(BB);
     
     // Before doing SelectionDAG ISel, see if FastISel has been requested.
-    if (FastIS && !SuppressFastISel) {
+    if (FastIS) {
       // Emit code for any incoming arguments. This must happen before
       // beginning FastISel on the entry block.
       if (LLVMBB == &Fn.getEntryBlock()) {