propagate fmf in br_cc

Author: paperchalice

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -19279,13 +19279,13 @@ SDValue DAGCombiner::visitBRCOND(SDNode *N) {
   // MachineBasicBlock CFG, which is awkward.
 
   // fold a brcond with a setcc condition into a BR_CC node if BR_CC is legal
-  // on the target.
+  // on the target, also copy fast math flags.
   if (N1.getOpcode() == ISD::SETCC &&
       TLI.isOperationLegalOrCustom(ISD::BR_CC,
                                    N1.getOperand(0).getValueType())) {
-    return DAG.getNode(ISD::BR_CC, SDLoc(N), MVT::Other,
-                       Chain, N1.getOperand(2),
-                       N1.getOperand(0), N1.getOperand(1), N2);
+    return DAG.getNode(ISD::BR_CC, SDLoc(N), MVT::Other, Chain,
+                       N1.getOperand(2), N1.getOperand(0), N1.getOperand(1), N2,
+                       N1->getFlags());
   }
 
   if (N1.hasOneUse()) {