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Fixes #64

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simon 2017-12-30 11:14:45 -05:00
parent 70a55dce59
commit 2ef6f492c4
1 changed files with 17 additions and 1 deletions
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18
Server/src/main/java/net/simon987/server/assembly/instruction/NegInstruction.java
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@ -14,7 +14,23 @@ public class NegInstruction extends Instruction {
@Override
public Status execute(Target dst, int dstIndex, Status status) {
dst.set(dstIndex, -dst.get(dstIndex));
//If the operand is zero, the carry flag is cleared; in all other cases, the carry flag is set.
char destination = (char) dst.get(dstIndex);
if (destination == 0) {
status.setCarryFlag(false);
status.setZeroFlag(true);
} else {
status.setCarryFlag(true);
}
//Attempting to negate a word containing -32,768 causes no change to the operand and sets the Overflow Flag.
if (destination == 0x8000) {
status.setOverflowFlag(true);
} else {
dst.set(dstIndex, -destination);
}
return status;
}