From 4af6e0d7836126630f579b0a34f054321187f00b Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sat, 2 Apr 2005 05:26:37 +0000 Subject: [PATCH] Expand fabs into fneg git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21013 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp index 2615a505862..731ea553222 100644 --- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp +++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp @@ -887,8 +887,16 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) { 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; } -- 2.34.1