[llvm-commits] [llvm] r45400 - /llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

[Chris Lattner]

Author: lattner
Date: Sat Dec 29 00:55:23 2007
New Revision: 45400

URL: http://llvm.org/viewvc/llvm-project?rev=45400&view=rev
Log:
don't fold fp_round(fp_extend(load)) -> fp_round(extload)

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp?rev=45400&r1=45399&r2=45400&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Sat Dec 29 00:55:23 2007
@@ -3672,6 +3672,10 @@
   ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
   MVT::ValueType VT = N->getValueType(0);
   
+  // If this is fp_round(fpextend), don't fold it, allow ourselves to be folded.
+  if (N->hasOneUse() && (*N->use_begin())->getOpcode() == ISD::FP_ROUND)
+    return SDOperand();
+  
   // fold (fp_extend c1fp) -> c1fp
   if (N0CFP && VT != MVT::ppcf128)
     return DAG.getNode(ISD::FP_EXTEND, VT, N0);