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

src/s390/simulator-s390.cc

Index: src/s390/simulator-s390.cc
diff --git a/src/s390/simulator-s390.cc b/src/s390/simulator-s390.cc
index 434fbffcfc53e040be9dafb7e593573090c8b536..a267d697d3b5d7e042ac85a5e3575ff81391990d 100644
--- a/src/s390/simulator-s390.cc
+++ b/src/s390/simulator-s390.cc
@@ -1793,6 +1793,11 @@ uint32_t Simulator::ReadWU(intptr_t addr, Instruction* instr) {
   return *ptr;
 }
 
+int64_t Simulator::ReadW64(intptr_t addr, Instruction* instr) {
+  int64_t* ptr = reinterpret_cast<int64_t*>(addr);
+  return *ptr;
+}
+
 int32_t Simulator::ReadW(intptr_t addr, Instruction* instr) {
   int32_t* ptr = reinterpret_cast<int32_t*>(addr);
   return *ptr;
@@ -5558,15 +5563,31 @@ bool Simulator::DecodeSixByteArithmetic(Instruction* instr) {
 }
 
 int16_t Simulator::ByteReverse(int16_t hword) {
+#if defined(__GNUC__)
+  return __builtin_bswap16(hword);
+#else
   return (hword << 8) | ((hword >> 8) & 0x00ff);
+#endif
 }
 
 int32_t Simulator::ByteReverse(int32_t word) {
+#if defined(__GNUC__)
+  return __builtin_bswap32(word);
+#else
   int32_t result = word << 24;
   result |= (word << 8) & 0x00ff0000;
   result |= (word >> 8) & 0x0000ff00;
   result |= (word >> 24) & 0x00000ff;
   return result;
+#endif
+}
+
+int64_t Simulator::ByteReverse(int64_t dword) {
+#if defined(__GNUC__)
+  return __builtin_bswap64(dword);
+#else
+#error unsupport __builtin_bswap64
+#endif
 }
 
 int Simulator::DecodeInstructionOriginal(Instruction* instr) {
@@ -9982,9 +10003,14 @@ EVALUATE(KMAC) {
 }
 
 EVALUATE(LRVR) {
-  UNIMPLEMENTED();
-  USE(instr);
-  return 0;
+  DCHECK_OPCODE(LRVR);
+  DECODE_RRE_INSTRUCTION(r1, r2);
+  int32_t r2_val = get_low_register<int32_t>(r2);
+  int32_t r1_val = 0;
+  r1_val = ByteReverse(r2_val);
+
+  set_low_register(r1, r1_val);
+  return length;
 }
 
 EVALUATE(CGR) {
@@ -10783,12 +10809,6 @@ EVALUATE(CVBG) {
   return 0;
 }
 
-EVALUATE(LRVG) {
-  UNIMPLEMENTED();
-  USE(instr);
-  return 0;
-}
-
 EVALUATE(LT) {
   DCHECK_OPCODE(LT);
   DECODE_RXY_A_INSTRUCTION(r1, x2, b2, d2);
@@ -10885,6 +10905,17 @@ EVALUATE(DSGF) {
   return 0;
 }
 
+EVALUATE(LRVG) {
+  DCHECK_OPCODE(LRVG);
+  DECODE_RXY_A_INSTRUCTION(r1, x2, b2, d2);
+  int64_t x2_val = (x2 == 0) ? 0 : get_register(x2);
+  int64_t b2_val = (b2 == 0) ? 0 : get_register(b2);
+  intptr_t mem_addr = b2_val + x2_val + d2;
+  int64_t mem_val = ReadW64(mem_addr, instr);
+  set_register(r1, ByteReverse(mem_val));
+  return length;
+}
+
 EVALUATE(LRV) {
   DCHECK_OPCODE(LRV);
   DECODE_RXY_A_INSTRUCTION(r1, x2, b2, d2);
@@ -10952,12 +10983,6 @@ EVALUATE(CVDG) {
   return 0;
 }
 
-EVALUATE(STRVG) {
-  UNIMPLEMENTED();
-  USE(instr);
-  return 0;
-}
-
 EVALUATE(CGF) {
   UNIMPLEMENTED();
   USE(instr);
@@ -10999,6 +11024,17 @@ EVALUATE(STRV) {
   return length;
 }
 
+EVALUATE(STRVG) {
+  DCHECK_OPCODE(STRVG);
+  DECODE_RXY_A_INSTRUCTION(r1, x2, b2, d2);
+  int64_t r1_val = get_register(r1);
+  int64_t x2_val = (x2 == 0) ? 0 : get_register(x2);
+  int64_t b2_val = (b2 == 0) ? 0 : get_register(b2);
+  intptr_t mem_addr = b2_val + x2_val + d2;
+  WriteDW(mem_addr, ByteReverse(r1_val));
+  return length;
+}
+
 EVALUATE(STRVH) {
   DCHECK_OPCODE(STRVH);
   DECODE_RXY_A_INSTRUCTION(r1, x2, b2, d2);