From: Mehdi Amini <mehdi.amini@apple.com>
Date: Fri, 23 Jan 2015 07:07:20 +0000 (+0000)
Subject: DAGCombine: always constant fold FMA when target disable FP exceptions
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=33cf319cd12340814a56a65945e7df70118420e0;p=oota-llvm.git

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>

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

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 24e9df3c71d..c354155b035 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -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;