DAGCombine: always constant fold FMA when target disable FP exceptions
authorMehdi Amini <mehdi.amini@apple.com>
Fri, 23 Jan 2015 07:07:20 +0000 (07:07 +0000)
committerMehdi Amini <mehdi.amini@apple.com>
Fri, 23 Jan 2015 07:07:20 +0000 (07:07 +0000)
Summary: When trying to constant fold an FMA in the DAG, getNode()
fails to fold the FMA if an operand is not finite. In this case this
patch allows the constant folding if !TLI->hasFloatingPointExceptions()

Reviewers: resistor

Reviewed By: resistor

Subscribers: hfinkel, llvm-commits

Differential Revision: http://reviews.llvm.org/D6912

From: Mehdi Amini <mehdi.amini@apple.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226901 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/SelectionDAG.cpp

index 24e9df3..c354155 100644 (file)
@@ -3620,7 +3620,7 @@ SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL, EVT VT,
       const APFloat &V3 = N3CFP->getValueAPF();
       APFloat::opStatus s =
         V1.fusedMultiplyAdd(V2, V3, APFloat::rmNearestTiesToEven);
-      if (s != APFloat::opInvalidOp)
+      if (!TLI->hasFloatingPointExceptions() || s != APFloat::opInvalidOp)
         return getConstantFP(V1, VT);
     }
     break;