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

[Chris Lattner]

Changes in directory llvm/lib/CodeGen/SelectionDAG:

LegalizeDAG.cpp updated: 1.70 -> 1.71
---
Log message:

Expand fabs into fneg


---
Diffs of the changes:  (+9 -1)

 LegalizeDAG.cpp |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletion(-)


Index: llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.70 llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.71
--- llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.70	Fri Apr  1 23:00:07 2005
+++ llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp	Fri Apr  1 23:26:37 2005
@@ -887,8 +887,16 @@
         Tmp2 = DAG.getConstantFP(-0.0, Node->getValueType(0));
         Result = LegalizeOp(DAG.getNode(ISD::SUB, Node->getValueType(0),
                                         Tmp2, Tmp1));
+      } else if (Node->getOpcode() == ISD::FABS) {
+        // Expand Y = FABS(X) -> Y = (X >u 0.0) ? X : fneg(X).
+        MVT::ValueType VT = Node->getValueType(0);
+        Tmp2 = DAG.getConstantFP(0.0, VT);
+        Tmp2 = DAG.getSetCC(ISD::SETUGT, TLI.getSetCCResultTy(), Tmp1, Tmp2);
+        Tmp3 = DAG.getNode(ISD::FNEG, VT, Tmp1);
+        Result = DAG.getNode(ISD::SELECT, VT, Tmp2, Tmp1, Tmp3);
+        Result = LegalizeOp(Result);
       } else {
-        assert(0 && "Expand fneg not impl yet!");
+        assert(0 && "Unreachable!");
       }
       break;
     }