[compiler] [wasm] Introduce Word32/64ReverseBytes as TF Optional Opcode

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

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 #include "src/s390/frames-s390.h"
 
@@ skipping 253 matching lines @@
     }
     InstructionOperand temps[] = {g.TempRegister(), g.TempRegister()};
     size_t const temp_count = arraysize(temps);
     InstructionCode code = kArchStoreWithWriteBarrier;
     code |= AddressingModeField::encode(addressing_mode);
     code |= MiscField::encode(static_cast<int>(record_write_mode));
     Emit(code, 0, nullptr, input_count, inputs, temp_count, temps);
   } else {
     ArchOpcode opcode = kArchNop;
     ImmediateMode mode = kInt16Imm;
+    NodeMatcher m(value);
     switch (rep) {
       case MachineRepresentation::kFloat32:
         opcode = kS390_StoreFloat32;
         break;
       case MachineRepresentation::kFloat64:
         opcode = kS390_StoreDouble;
         break;
       case MachineRepresentation::kBit:  // Fall through.
       case MachineRepresentation::kWord8:
         opcode = kS390_StoreWord8;
         break;
       case MachineRepresentation::kWord16:
         opcode = kS390_StoreWord16;
         break;
 #if !V8_TARGET_ARCH_S390X
       case MachineRepresentation::kTagged:  // Fall through.
 #endif
       case MachineRepresentation::kWord32:
         opcode = kS390_StoreWord32;
+        if (m.IsWord32ReverseBytes()) {
+          opcode = kS390_StoreReverse32;
+          value = value->InputAt(0);
+        }
         break;
 #if V8_TARGET_ARCH_S390X
       case MachineRepresentation::kTagged:  // Fall through.
       case MachineRepresentation::kWord64:
         opcode = kS390_StoreWord64;
         mode = kInt16Imm_4ByteAligned;
+        if (m.IsWord64ReverseBytes()) {
+          opcode = kS390_StoreReverse64;
+          value = value->InputAt(0);
+        }
         break;
 #else
       case MachineRepresentation::kWord64:  // Fall through.
 #endif
       case MachineRepresentation::kSimd128:  // Fall through.
       case MachineRepresentation::kNone:
         UNREACHABLE();
         return;
     }
     if (g.CanBeImmediate(offset, mode)) {
@@ skipping 571 matching lines @@
 #if V8_TARGET_ARCH_S390X
 void InstructionSelector::VisitWord64Ctz(Node* node) { UNREACHABLE(); }
 #endif
 
 void InstructionSelector::VisitWord32ReverseBits(Node* node) { UNREACHABLE(); }
 
 #if V8_TARGET_ARCH_S390X
 void InstructionSelector::VisitWord64ReverseBits(Node* node) { UNREACHABLE(); }
 #endif
 
+void InstructionSelector::VisitWord64ReverseBytes(Node* node) {
+  S390OperandGenerator g(this);
+  Emit(kS390_LoadReverse64RR, g.DefineAsRegister(node),
+       g.UseRegister(node->InputAt(0)));
+}
+
+void InstructionSelector::VisitWord32ReverseBytes(Node* node) {
+  S390OperandGenerator g(this);
+  NodeMatcher input(node->InputAt(0));
+  if (CanCover(node, input.node()) && input.IsLoad()) {
+    LoadRepresentation load_rep = LoadRepresentationOf(input.node()->op());
+    if (load_rep.representation() == MachineRepresentation::kWord32) {
+      Node* base = input.node()->InputAt(0);
+      Node* offset = input.node()->InputAt(1);
+      Emit(kS390_LoadReverse32 | AddressingModeField::encode(kMode_MRR),
+           // TODO(john.yan): one of the base and offset can be imm.
+           g.DefineAsRegister(node), g.UseRegister(base),
+           g.UseRegister(offset));
+      return;
+    }
+  }
+  Emit(kS390_LoadReverse32RR, g.DefineAsRegister(node),
+       g.UseRegister(node->InputAt(0)));
+}
+
 void InstructionSelector::VisitInt32Add(Node* node) {
   VisitBinop<Int32BinopMatcher>(this, node, kS390_Add, kInt16Imm);
 }
 
 #if V8_TARGET_ARCH_S390X
 void InstructionSelector::VisitInt64Add(Node* node) {
   VisitBinop<Int64BinopMatcher>(this, node, kS390_Add, kInt16Imm);
 }
 #endif
 
@@ skipping 984 matching lines @@
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
   return MachineOperatorBuilder::kFloat32RoundDown |
          MachineOperatorBuilder::kFloat64RoundDown |
          MachineOperatorBuilder::kFloat32RoundUp |
          MachineOperatorBuilder::kFloat64RoundUp |
          MachineOperatorBuilder::kFloat32RoundTruncate |
          MachineOperatorBuilder::kFloat64RoundTruncate |
          MachineOperatorBuilder::kFloat64RoundTiesAway |
          MachineOperatorBuilder::kWord32Popcnt |
+         MachineOperatorBuilder::kWord32ReverseBytes |
+         MachineOperatorBuilder::kWord64ReverseBytes |
          MachineOperatorBuilder::kWord64Popcnt;
 }
 
 // static
 MachineOperatorBuilder::AlignmentRequirements
 InstructionSelector::AlignmentRequirements() {
   return MachineOperatorBuilder::AlignmentRequirements::
       FullUnalignedAccessSupport();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8