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

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

Index: src/compiler/mips/instruction-selector-mips.cc
diff --git a/src/compiler/mips/instruction-selector-mips.cc b/src/compiler/mips/instruction-selector-mips.cc
index efcec0c8f109dab5f57d200dadb5ac630af46985..8a0ba14705c691ce9903bc52a777f0d7e49973c7 100644
--- a/src/compiler/mips/instruction-selector-mips.cc
+++ b/src/compiler/mips/instruction-selector-mips.cc
@@ -482,7 +482,11 @@ void InstructionSelector::VisitWord32ReverseBits(Node* node) { UNREACHABLE(); }
 
 void InstructionSelector::VisitWord64ReverseBytes(Node* node) { UNREACHABLE(); }
 
-void InstructionSelector::VisitWord32ReverseBytes(Node* node) { UNREACHABLE(); }
+void InstructionSelector::VisitWord32ReverseBytes(Node* node) {
+  MipsOperandGenerator g(this);
+  Emit(kMipsByteSwap32, g.DefineAsRegister(node),
+       g.UseRegister(node->InputAt(0)));
+}
 
 void InstructionSelector::VisitWord32Ctz(Node* node) {
   MipsOperandGenerator g(this);
@@ -1619,7 +1623,9 @@ InstructionSelector::SupportedMachineOperatorFlags() {
          MachineOperatorBuilder::kFloat32RoundDown |
          MachineOperatorBuilder::kFloat32RoundUp |
          MachineOperatorBuilder::kFloat32RoundTruncate |
-         MachineOperatorBuilder::kFloat32RoundTiesEven;
+         MachineOperatorBuilder::kFloat32RoundTiesEven |
+         MachineOperatorBuilder::kWord32ReverseBytes |
+         MachineOperatorBuilder::kWord64ReverseBytes;
 }
 
 // static