From: Bill Wendling <isanbard@gmail.com>
Date: Tue, 23 Oct 2007 21:30:25 +0000 (+0000)
Subject: Lowering a memcpy to the stack is killing PPC. The ARM and X86 backends already
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=de09040946b4aa9bdc70057d65f840685ac31fef;p=oota-llvm.git

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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43262 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 610c898d170..4468d16e8c2 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/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();