[SelectionDAG] Remove debug locations from ConstantSD(FP)Nodes

This removes debug locations from ConstantSDNode and ConstantSDFPNode.

When this kind of node is materialized we no longer create a line table
entry which jumps back to the constant's first point of use. This makes
single-stepping behavior smoother, and it matches the model used by IR,
where Constants have no locations. See this thread for more context:

  http://lists.llvm.org/pipermail/llvm-dev/2018-June/124164.html

I'd like to handle constant BuildVectorSDNodes and to try to eliminate
passing SDLocs to SelectionDAG::getConstant*() in follow-up commits.

Differential Revision: https://reviews.llvm.org/D48468

llvm-svn: 335497

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 4fdd3de0ebc..20c0c35332e 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -1243,7 +1243,7 @@ SDValue SelectionDAG::getConstant(const ConstantInt &Val, const SDLoc &DL,
       return SDValue(N, 0);
 
   if (!N) {
-    N = newSDNode<ConstantSDNode>(isT, isO, Elt, DL.getDebugLoc(), EltVT);
+    N = newSDNode<ConstantSDNode>(isT, isO, Elt, EltVT);
     CSEMap.InsertNode(N, IP);
     InsertNode(N);
     NewSDValueDbgMsg(SDValue(N, 0), "Creating constant: ", this);
@@ -1286,7 +1286,7 @@ SDValue SelectionDAG::getConstantFP(const ConstantFP &V, const SDLoc &DL,
       return SDValue(N, 0);
 
   if (!N) {
-    N = newSDNode<ConstantFPSDNode>(isTarget, &V, DL.getDebugLoc(), EltVT);
+    N = newSDNode<ConstantFPSDNode>(isTarget, &V, EltVT);
     CSEMap.InsertNode(N, IP);
     InsertNode(N);
   }