[llvm] r292818 - AMDGPU: Propagate fast math flags in fneg combines

[Matt Arsenault via llvm-commits]

Author: arsenm
Date: Mon Jan 23 13:08:34 2017
New Revision: 292818

URL: http://llvm.org/viewvc/llvm-project?rev=292818&view=rev
Log:
AMDGPU: Propagate fast math flags in fneg combines

Can't for fma/mad since it seems they can't have flags currently.

Modified:
    llvm/trunk/lib/Target/AMDGPU/AMDGPUISelLowering.cpp

Modified: llvm/trunk/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/AMDGPUISelLowering.cpp?rev=292818&r1=292817&r2=292818&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/AMDGPUISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/AMDGPU/AMDGPUISelLowering.cpp Mon Jan 23 13:08:34 2017
@@ -2872,7 +2872,7 @@ SDValue AMDGPUTargetLowering::performFNe
     else
       RHS = RHS.getOperand(0);
 
-    SDValue Res = DAG.getNode(ISD::FADD, SL, VT, LHS, RHS);
+    SDValue Res = DAG.getNode(ISD::FADD, SL, VT, LHS, RHS, N0->getFlags());
     if (!N0.hasOneUse())
       DAG.ReplaceAllUsesWith(N0, DAG.getNode(ISD::FNEG, SL, VT, Res));
     return Res;
@@ -2891,7 +2891,7 @@ SDValue AMDGPUTargetLowering::performFNe
     else
       RHS = DAG.getNode(ISD::FNEG, SL, VT, RHS);
 
-    SDValue Res = DAG.getNode(Opc, SL, VT, LHS, RHS);
+    SDValue Res = DAG.getNode(Opc, SL, VT, LHS, RHS, N0->getFlags());
     if (!N0.hasOneUse())
       DAG.ReplaceAllUsesWith(N0, DAG.getNode(ISD::FNEG, SL, VT, Res));
     return Res;
@@ -2941,7 +2941,7 @@ SDValue AMDGPUTargetLowering::performFNe
     // (fneg (fp_extend x)) -> (fp_extend (fneg x))
     // (fneg (rcp x)) -> (rcp (fneg x))
     SDValue Neg = DAG.getNode(ISD::FNEG, SL, CvtSrc.getValueType(), CvtSrc);
-    return DAG.getNode(Opc, SL, VT, Neg);
+    return DAG.getNode(Opc, SL, VT, Neg, N0->getFlags());
   }
   case ISD::FP_ROUND: {
     SDValue CvtSrc = N0.getOperand(0);