[SelectionDAG] change getConstant() to use the input SDLoc when building splat vectors

The code change is simple enough: instead of attaching an anonymous SDLoc to splatted
vector constants, use the scalar constant's existing SDLoc since that is what is passed 
into getConstant() as a param. But this changes instruction scheduling, so I'll explain
why that happens.

The motivation for this patch starts near:
http://reviews.llvm.org/rL258833
...x86's getZeroVector() could be similarly cleaned up and I thought it would be 'NFC'.
But when I made that change locally, several x86 codegen tests wiggled.

It turns out that the lack of SDLoc consistency in getConstant() changes the way 
ScheduleDAGRRList behaves. This is because the SDLoc contains 'IROrder' and some DAG
scheduler algorithms use IROrder for tie-breaking.

Differential Revision: http://reviews.llvm.org/D16972

llvm-svn: 260582

1 files changed, 4 insertions, 5 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 4e6d2e5431d..95dc360b07d 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -1167,9 +1167,8 @@ SDValue SelectionDAG::getConstant(const ConstantInt &Val, SDLoc DL, EVT VT,
     for (unsigned i = 0; i < VT.getVectorNumElements(); ++i)
       Ops.insert(Ops.end(), EltParts.begin(), EltParts.end());
 
-    SDValue Result = getNode(ISD::BITCAST, SDLoc(), VT,
-                             getNode(ISD::BUILD_VECTOR, SDLoc(), ViaVecVT,
-                                     Ops));
+    SDValue Result = getNode(ISD::BITCAST, DL, VT,
+                             getNode(ISD::BUILD_VECTOR, DL, ViaVecVT, Ops));
     return Result;
   }
 
@@ -1197,7 +1196,7 @@ SDValue SelectionDAG::getConstant(const ConstantInt &Val, SDLoc DL, EVT VT,
   if (VT.isVector()) {
     SmallVector<SDValue, 8> Ops;
     Ops.assign(VT.getVectorNumElements(), Result);
-    Result = getNode(ISD::BUILD_VECTOR, SDLoc(), VT, Ops);
+    Result = getNode(ISD::BUILD_VECTOR, DL, VT, Ops);
   }
   return Result;
 }
@@ -1241,7 +1240,7 @@ SDValue SelectionDAG::getConstantFP(const ConstantFP& V, SDLoc DL, EVT VT,
   if (VT.isVector()) {
     SmallVector<SDValue, 8> Ops;
     Ops.assign(VT.getVectorNumElements(), Result);
-    Result = getNode(ISD::BUILD_VECTOR, SDLoc(), VT, Ops);
+    Result = getNode(ISD::BUILD_VECTOR, DL, VT, Ops);
   }
   return Result;
 }