remove UnsafeFPMath usage in visitFDIV

Author: paperchalice

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -18237,8 +18237,7 @@ SDValue DAGCombiner::visitFDIV(SDNode *N) {
     // Only do the transform if the reciprocal is a legal fp immediate that
     // isn't too nasty (eg NaN, denormal, ...).
     if (((st == APFloat::opOK && !Recip.isDenormal()) ||
-         (st == APFloat::opInexact &&
-          (Options.UnsafeFPMath || Flags.hasAllowReciprocal()))) &&
+         (st == APFloat::opInexact && Flags.hasAllowReciprocal())) &&
         (!LegalOperations ||
          // FIXME: custom lowering of ConstantFP might fail (see e.g. ARM
          // backend)... we should handle this gracefully after Legalize.
@@ -18249,7 +18248,7 @@ SDValue DAGCombiner::visitFDIV(SDNode *N) {
                          DAG.getConstantFP(Recip, DL, VT));
   }
 
-  if (Options.UnsafeFPMath || Flags.hasAllowReciprocal()) {
+  if (Flags.hasAllowReciprocal()) {
     // If this FDIV is part of a reciprocal square root, it may be folded
     // into a target-specific square root estimate instruction.
     if (N1.getOpcode() == ISD::FSQRT) {
@@ -18324,7 +18323,7 @@ SDValue DAGCombiner::visitFDIV(SDNode *N) {
 
   // Fold X/Sqrt(X) -> Sqrt(X)
   if ((Options.NoSignedZerosFPMath || Flags.hasNoSignedZeros()) &&
-      (Options.UnsafeFPMath || Flags.hasAllowReassociation()))
+      Flags.hasAllowReassociation())
     if (N1.getOpcode() == ISD::FSQRT && N0 == N1.getOperand(0))
       return N1;