[x64][ia32] Add Support for the Float64Neg and Float32Neg turbofan operators.

Benedikt, do you think we could also provide these operators on mips,
maybe by expanding them to "-0.0 -x"? If mips can provide these operators,
then we could make Float64Neg and Float32Neg real operators and not just
OptionalOperators.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2218023002
Cr-Commit-Position: refs/heads/master@{#38383}

src/compiler/ia32/instruction-selector-ia32.cc

@@ -1082,9 +1082,13 @@ void InstructionSelector::VisitFloat64RoundTiesEven(Node* node) {
   VisitRR(this, node, kSSEFloat64Round | MiscField::encode(kRoundToNearest));
 }
 
-void InstructionSelector::VisitFloat32Neg(Node* node) { UNREACHABLE(); }
+void InstructionSelector::VisitFloat32Neg(Node* node) {
+  VisitFloatUnop(this, node, node->InputAt(0), kAVXFloat32Neg, kSSEFloat32Neg);
+}
 
-void InstructionSelector::VisitFloat64Neg(Node* node) { UNREACHABLE(); }
+void InstructionSelector::VisitFloat64Neg(Node* node) {
+  VisitFloatUnop(this, node, node->InputAt(0), kAVXFloat64Neg, kSSEFloat64Neg);
+}
 
 void InstructionSelector::VisitFloat64Ieee754Binop(Node* node,
                                                    InstructionCode opcode) {
@@ -1701,7 +1705,8 @@ MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
   MachineOperatorBuilder::Flags flags =
       MachineOperatorBuilder::kWord32ShiftIsSafe |
-      MachineOperatorBuilder::kWord32Ctz;
+      MachineOperatorBuilder::kWord32Ctz | MachineOperatorBuilder::kFloat32Neg |
+      MachineOperatorBuilder::kFloat64Neg;
   if (CpuFeatures::IsSupported(POPCNT)) {
     flags |= MachineOperatorBuilder::kWord32Popcnt;
   }

src/compiler/x64/instruction-selector-x64.cc

@@ -1455,9 +1455,13 @@ void InstructionSelector::VisitFloat64RoundTiesEven(Node* node) {
   VisitRR(this, node, kSSEFloat64Round | MiscField::encode(kRoundToNearest));
 }
 
-void InstructionSelector::VisitFloat32Neg(Node* node) { UNREACHABLE(); }
+void InstructionSelector::VisitFloat32Neg(Node* node) {
+  VisitFloatUnop(this, node, node->InputAt(0), kAVXFloat32Neg, kSSEFloat32Neg);
+}
 
-void InstructionSelector::VisitFloat64Neg(Node* node) { UNREACHABLE(); }
+void InstructionSelector::VisitFloat64Neg(Node* node) {
+  VisitFloatUnop(this, node, node->InputAt(0), kAVXFloat64Neg, kSSEFloat64Neg);
+}
 
 void InstructionSelector::VisitFloat64Ieee754Binop(Node* node,
                                                    InstructionCode opcode) {
@@ -2182,7 +2186,8 @@ MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
   MachineOperatorBuilder::Flags flags =
       MachineOperatorBuilder::kWord32ShiftIsSafe |
-      MachineOperatorBuilder::kWord32Ctz | MachineOperatorBuilder::kWord64Ctz;
+      MachineOperatorBuilder::kWord32Ctz | MachineOperatorBuilder::kWord64Ctz |
+      MachineOperatorBuilder::kFloat32Neg | MachineOperatorBuilder::kFloat64Neg;
   if (CpuFeatures::IsSupported(POPCNT)) {
     flags |= MachineOperatorBuilder::kWord32Popcnt |
              MachineOperatorBuilder::kWord64Popcnt;