added instruction functionality

simulator_SIC_XE/include/utils.h

@@ -0,0 +1,80 @@
+#ifndef UTILS_H
+#define UTILS_H
+
+#include "constants.h"
+
+// ==============================
+// SIC/XE Utility Functions
+// ==============================
+
+// Instruction bit extraction utilities
+inline int getXBit(int b2) {
+    return (b2 & 0x80) ? 1 : 0;  
+}
+
+inline int getBPBits(int b2) {
+    return (b2 >> 5) & 0x03;  
+}
+
+enum class AddressingMode {
+    IMMEDIATE,
+    INDIRECT,
+    SIMPLE,
+    SIC_DIRECT,
+    INVALID
+};
+
+// Get addressing mode from ni bits
+AddressingMode getAddressingMode(int ni);
+
+
+// convert to signed 24-bit integer
+inline int toSIC24(int value) {
+    value &= 0xFFFFFF;
+    if (value & 0x800000) {
+        value -= 0x1000000;
+    }
+    return value;
+}
+
+inline int setCC(int sw, int cc) {
+    sw &= ~CC_MASK;     
+    sw |= (cc & CC_MASK);
+    return sw;
+}
+
+inline int sic_comp(int a, int b, int sw) {
+    int sa = toSIC24(a);
+    int sb = toSIC24(b);
+
+    int cc;
+    if (sa < sb) {
+        cc = CC_LT;
+    } else if (sa == sb) {
+        cc = CC_EQ;
+    } else {
+        cc = CC_GT;
+    }
+
+    return setCC(sw, cc);
+}
+
+inline int sic_comp(double a, double b, int sw) {
+    int cc;
+    if (a < b) {
+        cc = CC_LT;
+    } else if (a == b) {
+        cc = CC_EQ;
+    } else {
+        cc = CC_GT;
+    }
+
+    return setCC(sw, cc);
+}
+
+
+inline int getCC(int sw) {
+    return sw & CC_MASK;
+}
+
+#endif // UTILS_H