s390x: add AddU64 in macroassembler

Change-Id: I9ccd6181437017aea627373b9f323efa6b4a183d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3437825Reviewed-by: Milad Farazmand <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#78931}

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

@@ -2929,6 +2929,25 @@ void TurboAssembler::AddU64(Register dst, const Operand& imm) {
   algfi(dst, imm);
 }
 
+void TurboAssembler::AddU64(Register dst, Register src1, Register src2) {
+  if (dst != src2 && dst != src1) {
+    if (CpuFeatures::IsSupported(DISTINCT_OPS)) {
+      algrk(dst, src1, src2);
+    } else {
+      lgr(dst, src1);
+      algr(dst, src2);
+    }
+  } else if (dst != src2) {
+    // dst == src1
+    DCHECK(dst == src1);
+    algr(dst, src2);
+  } else {
+    // dst == src2
+    DCHECK(dst == src2);
+    algr(dst, src1);
+  }
+}
+
 // Add Logical 32-bit (Register-Memory)
 void TurboAssembler::AddU32(Register dst, const MemOperand& opnd) {
   DCHECK(is_int20(opnd.offset()));

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

@@ -240,6 +240,7 @@ class V8_EXPORT_PRIVATE TurboAssembler : public TurboAssemblerBase {
   // Add Logical (Register - Immediate)
   void AddU32(Register dst, const Operand& imm);
   void AddU64(Register dst, const Operand& imm);
+  void AddU64(Register dst, Register src1, Register src2);
 
   // Add Logical (Register - Mem)
   void AddU32(Register dst, const MemOperand& opnd);