PPC/s390: [turbofan] Remove the FloatXXSubPreserveNan operators.

src/compiler/s390/instruction-selector-s390.cc

Index: src/compiler/s390/instruction-selector-s390.cc
diff --git a/src/compiler/s390/instruction-selector-s390.cc b/src/compiler/s390/instruction-selector-s390.cc
index 1f3a621a759017fd7a5690a1d81cf867a8b7fecc..2fd3f78f593ea373e8018e06cbf3eb95ff822f99 100644
--- a/src/compiler/s390/instruction-selector-s390.cc
+++ b/src/compiler/s390/instruction-selector-s390.cc
@@ -1132,47 +1132,11 @@ void InstructionSelector::VisitFloat64Add(Node* node) {
 }
 
 void InstructionSelector::VisitFloat32Sub(Node* node) {
-  S390OperandGenerator g(this);
-  Float32BinopMatcher m(node);
-  if (m.left().IsMinusZero()) {
-    Emit(kS390_NegDouble, g.DefineAsRegister(node),
-         g.UseRegister(m.right().node()));
-    return;
-  }
-  VisitRRR(this, kS390_SubFloat, node);
-}
-
-void InstructionSelector::VisitFloat32SubPreserveNan(Node* node) {
-  S390OperandGenerator g(this);
   VisitRRR(this, kS390_SubFloat, node);
 }
 
 void InstructionSelector::VisitFloat64Sub(Node* node) {
   // TODO(mbrandy): detect multiply-subtract
-  S390OperandGenerator g(this);
-  Float64BinopMatcher m(node);
-  if (m.left().IsMinusZero()) {
-    if (m.right().IsFloat64RoundDown() &&
-        CanCover(m.node(), m.right().node())) {
-      if (m.right().InputAt(0)->opcode() == IrOpcode::kFloat64Sub &&
-          CanCover(m.right().node(), m.right().InputAt(0))) {
-        Float64BinopMatcher mright0(m.right().InputAt(0));
-        if (mright0.left().IsMinusZero()) {
-          // -floor(-x) = ceil(x)
-          Emit(kS390_CeilDouble, g.DefineAsRegister(node),
-               g.UseRegister(mright0.right().node()));
-          return;
-        }
-      }
-    }
-    Emit(kS390_NegDouble, g.DefineAsRegister(node),
-         g.UseRegister(m.right().node()));
-    return;
-  }
-  VisitRRR(this, kS390_SubDouble, node);
-}
-
-void InstructionSelector::VisitFloat64SubPreserveNan(Node* node) {
   VisitRRR(this, kS390_SubDouble, node);
 }