[llvm-commits] CVS: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

[Chris Lattner]

Changes in directory llvm/lib/CodeGen/SelectionDAG:

DAGCombiner.cpp updated: 1.156 -> 1.157
---
Log message:

Fold (fpext (load x)) -> (extload x)


---
Diffs of the changes:  (+14 -0)

 DAGCombiner.cpp |   14 ++++++++++++++
 1 files changed, 14 insertions(+)


Index: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.156 llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.157
--- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.156	Fri May  5 01:32:04 2006
+++ llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp	Fri May  5 16:34:35 2006
@@ -2413,6 +2413,20 @@
   // fold (fp_extend c1fp) -> c1fp
   if (N0CFP)
     return DAG.getNode(ISD::FP_EXTEND, VT, N0);
+  
+  // fold (fpext (load x)) -> (fpext (fpround (extload x)))
+  if (N0.getOpcode() == ISD::LOAD && N0.hasOneUse() &&
+      (!AfterLegalize||TLI.isOperationLegal(ISD::EXTLOAD, N0.getValueType()))) {
+    SDOperand ExtLoad = DAG.getExtLoad(ISD::EXTLOAD, VT, N0.getOperand(0),
+                                       N0.getOperand(1), N0.getOperand(2),
+                                       N0.getValueType());
+    CombineTo(N, ExtLoad);
+    CombineTo(N0.Val, DAG.getNode(ISD::FP_ROUND, N0.getValueType(), ExtLoad),
+              ExtLoad.getValue(1));
+    return SDOperand(N, 0);   // Return N so it doesn't get rechecked!
+  }
+  
+  
   return SDOperand();
 }