S390 [liftoff]: Implement simd const128

Change-Id: I39049c88f48c81b2f8ce84e9589e05405abce3a6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3453783Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#79056}

src/codegen/s390/macro-assembler-s390.cc

@@ -5970,6 +5970,13 @@ void TurboAssembler::I32x4TruncSatF64x2UZero(Simd128Register dst,
   vpkls(dst, dst, scratch, Condition(0), Condition(3));
 }
 
+void TurboAssembler::S128Const(Simd128Register dst, uint64_t high, uint64_t low,
+                               Register scratch1, Register scratch2) {
+  mov(scratch1, Operand(low));
+  mov(scratch2, Operand(high));
+  vlvgp(dst, scratch2, scratch1);
+}
+
 // Vector LE Load and Transform instructions.
 #ifdef V8_TARGET_BIG_ENDIAN
 #define IS_BIG_ENDIAN true

src/codegen/s390/macro-assembler-s390.h

@@ -1144,6 +1144,8 @@ class V8_EXPORT_PRIVATE TurboAssembler : public TurboAssemblerBase {
                                Simd128Register scratch);
   void I32x4TruncSatF64x2UZero(Simd128Register dst, Simd128Register src,
                                Simd128Register scratch);
+  void S128Const(Simd128Register dst, uint64_t high, uint64_t low,
+                 Register scratch1, Register scratch2);
   void S128Select(Simd128Register dst, Simd128Register src1,
                   Simd128Register src2, Simd128Register mask);
 

src/compiler/backend/s390/code-generator-s390.cc

@@ -2866,9 +2866,7 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     case kS390_S128Const: {
       uint64_t low = make_uint64(i.InputUint32(1), i.InputUint32(0));
       uint64_t high = make_uint64(i.InputUint32(3), i.InputUint32(2));
-      __ mov(r0, Operand(low));
-      __ mov(ip, Operand(high));
-      __ vlvgp(i.OutputSimd128Register(), ip, r0);
+      __ S128Const(i.OutputSimd128Register(), high, low, r0, ip);
       break;
     }
     case kS390_S128Zero: {

src/wasm/baseline/s390/liftoff-assembler-s390.h

@@ -2662,7 +2662,13 @@ void LiftoffAssembler::emit_i8x16_bitmask(LiftoffRegister dst,
 
 void LiftoffAssembler::emit_s128_const(LiftoffRegister dst,
                                        const uint8_t imms[16]) {
-  bailout(kUnsupportedArchitecture, "emit_s128_const");
+  uint64_t vals[2];
+  memcpy(vals, imms, sizeof(vals));
+#ifdef V8_TARGET_BIG_ENDIAN
+  vals[0] = ByteReverse(vals[0]);
+  vals[1] = ByteReverse(vals[1]);
+#endif
+  S128Const(dst.fp(), vals[1], vals[0], r0, ip);
 }
 
 void LiftoffAssembler::emit_s128_select(LiftoffRegister dst,