Propagate changes from my local tree. This patch includes:

1. New parameter attribute called 'inreg'. It has meaning "place this
parameter in registers, if possible". This is some generalization of
gcc's regparm(n) attribute. It's currently used only in X86-32 backend.
2. Completely rewritten CC handling/lowering code inside X86 backend.
Merged stdcall + c CCs and fastcall + fast CC.
3. Dropped CSRET CC. We cannot add struct return variant for each
target-specific CC (e.g. stdcall + csretcc and so on).
4. Instead of CSRET CC introduced 'sret' parameter attribute. Setting in
on first attribute has meaning 'This is hidden pointer to structure
return. Handle it gently'.
5. Fixed small bug in llvm-extract + add new feature to
FunctionExtraction pass, which relinks all internal-linkaged callees
from deleted function to external linkage. This will allow further
linking everything together.

NOTEs: 1. Documentation will be updated soon.
       2. llvm-upgrade should be improved to translate csret => sret.
          Before this, there will be some unexpected test fails.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33597 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 2 deletions

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 5f5f0d360f..84754ce9af 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -2168,6 +2168,7 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
       const char *FnName = 0;
       if (Node->getOpcode() == ISD::MEMSET) {
         Entry.Node = Tmp2; Entry.isSigned = false; Entry.Ty = IntPtrTy;
+	Entry.isInReg = false;
         Args.push_back(Entry);
         // Extend the (previously legalized) ubyte argument to be an int value
         // for the call.
@@ -2176,6 +2177,7 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
         else
           Tmp3 = DAG.getNode(ISD::ZERO_EXTEND, MVT::i32, Tmp3);
         Entry.Node = Tmp3; Entry.Ty = Type::Int32Ty; Entry.isSigned = true;
+	Entry.isInReg = false;
         Args.push_back(Entry);
         Entry.Node = Tmp4; Entry.Ty = IntPtrTy; Entry.isSigned = false;
         Args.push_back(Entry);
@@ -2183,7 +2185,7 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
         FnName = "memset";
       } else if (Node->getOpcode() == ISD::MEMCPY ||
                  Node->getOpcode() == ISD::MEMMOVE) {
-        Entry.Ty = IntPtrTy; Entry.isSigned = false;
+        Entry.Ty = IntPtrTy; Entry.isSigned = false; Entry.isInReg = false;
         Entry.Node = Tmp2; Args.push_back(Entry);
         Entry.Node = Tmp3; Args.push_back(Entry);
         Entry.Node = Tmp4; Args.push_back(Entry);
@@ -4124,7 +4126,7 @@ SDOperand SelectionDAGLegalize::ExpandLibCall(const char *Name, SDNode *Node,
     MVT::ValueType ArgVT = Node->getOperand(i).getValueType();
     const Type *ArgTy = MVT::getTypeForValueType(ArgVT);
     Entry.Node = Node->getOperand(i); Entry.Ty = ArgTy; 
-    Entry.isSigned = isSigned;
+    Entry.isSigned = isSigned; Entry.isInReg = false;
     Args.push_back(Entry);
   }
   SDOperand Callee = DAG.getExternalSymbol(Name, TLI.getPointerTy());