DAGCombine: always constant fold FMA when target disable FP exceptions
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>
llvm-svn: 226901
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 24e9df3..c354155 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -3620,7 +3620,7 @@
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;