S390: Implemented ALCR in S390 simulator.

src/s390/simulator-s390.h

Index: src/s390/simulator-s390.h
diff --git a/src/s390/simulator-s390.h b/src/s390/simulator-s390.h
index 8fee5145e66cbacc61ee49693d874646891c6b38..ae3dd5820944ced1a8cd8b56e89e0091f467ceb3 100644
--- a/src/s390/simulator-s390.h
+++ b/src/s390/simulator-s390.h
@@ -309,6 +309,7 @@ class Simulator {
   bool DecodeTwoByte(Instruction* instr);
   bool DecodeFourByte(Instruction* instr);
   bool DecodeFourByteArithmetic(Instruction* instr);
+  bool DecodeFourByteArithmetic64Bit(Instruction* instr);
   bool DecodeFourByteFloatingPoint(Instruction* instr);
   void DecodeFourByteFloatingPointIntConversion(Instruction* instr);
   void DecodeFourByteFloatingPointRound(Instruction* instr);
@@ -395,6 +396,23 @@ class Simulator {
     if (condition_reg_ == 0) condition_reg_ = unordered;
   }
 
+  // Used by arithmetic operations that use carry.
+  template <typename T>
+  void SetS390ConditionCodeCarry(T result, bool overflow) {
+    condition_reg_ = 0;
+    bool zero_result = (result == static_cast<T>(0));
+    if (zero_result && !overflow) {
+      condition_reg_ |= 8;
+    } else if (!zero_result && !overflow) {
+      condition_reg_ |= 4;
+    } else if (zero_result && overflow) {
+      condition_reg_ |= 2;
+    } else if (!zero_result && overflow) {
+      condition_reg_ |= 1;
+    }
+    if (condition_reg_ == 0) UNREACHABLE();
+  }
+
   bool isNaN(double value) { return (value != value); }
 
   // Set the condition code for bitwise operations