If a target really needs to custom lower constants, it should be allowed

to do so.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40955 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 274535633ce3b12cc5c252d180ef4c43bc1629e6..5c8c9e3e33d92bec8ab27c3a9efbd5de4f3cc6c6 100644 (file)
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -965,13 +965,21 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
     }
     break;
 
-  case ISD::Constant:
+  case ISD::Constant: {
+    ConstantSDNode *CN = cast<ConstantSDNode>(Node);
+    unsigned opAction =
+      TLI.getOperationAction(ISD::Constant, CN->getValueType(0));
+
     // We know we don't need to expand constants here, constants only have one
     // value and we check that it is fine above.
 
-    // FIXME: Maybe we should handle things like targets that don't support full
-    // 32-bit immediates?
+    if (opAction == TargetLowering::Custom) {
+      Tmp1 = TLI.LowerOperation(Result, DAG);
+      if (Tmp1.Val)
+        Result = Tmp1;
+    }
     break;
+  }
   case ISD::ConstantFP: {
     // Spill FP immediates to the constant pool if the target cannot directly
     // codegen them.  Targets often have some immediate values that can be