From 8971440e56b7dcb77db4cdf3f8b55489975958c4 Mon Sep 17 00:00:00 2001
From: Bill Wendling <isanbard@gmail.com>
Date: Tue, 23 Oct 2007 21:30:25 +0000
Subject: [PATCH] Lowering a memcpy to the stack is killing PPC. The ARM and
 X86 backends already have their own custom memcpy lowering code. This code
 needs to be factored out into a target-independent lowering method with hooks
 to the backend. In the meantime, just call memcpy if we're trying to copy
 onto a stack.

llvm-svn: 43262
---
 llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 610c898d1705..4468d16e8c27 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -4302,6 +4302,10 @@ void SelectionDAGLowering::visitMemIntrinsic(CallInst &I, unsigned Op) {
       break;
     }
     case ISD::MEMCPY: {
+      // FIXME: Disabling memcpy lowering for copying onto the stack.
+      if (Op1.getOpcode() == ISD::FrameIndex)
+        break;
+
       if (MeetsMaxMemopRequirement(MemOps, TLI.getMaxStoresPerMemcpy(),
                                    Size->getValue(), Align, TLI)) {
         unsigned NumMemOps = MemOps.size();