simon987/Much-Assembly-Required
1
0
Fork 0
mirror of https://github.com/simon987/Much-Assembly-Required.git synced 2025-04-19 18:46:43 +00:00
Code Issues Projects Releases Wiki Activity

Added SAR Instructions #7.

Browse Source
This commit is contained in:
simon 2017-11-13 21:39:16 -05:00
parent 42421b7710
commit 3ee9b4be95
2 changed files with 70 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Server/src/net/simon987/server/assembly/DefaultInstructionSet.java
View File

@ -41,6 +41,9 @@ public class DefaultInstructionSet implements InstructionSet {
add(new NotInstruction()); add(new NotInstruction());
add(new RorInstruction()); add(new RorInstruction());
add(new RolInstruction()); add(new RolInstruction());
add(new RclInstruction());
add(new RcrInstruction());
add(new SarInstruction());
} }
/** /**

67
Server/src/net/simon987/server/assembly/instruction/SarInstruction.java Normal file
View File

@ -0,0 +1,67 @@
package net.simon987.server.assembly.instruction;
import net.simon987.server.assembly.Instruction;
import net.simon987.server.assembly.Status;
import net.simon987.server.assembly.Target;
/**
*
*/
public class SarInstruction extends Instruction {
private static final int OPCODE = 41;
public SarInstruction() {
super("sar", OPCODE);
}
@Override
public Status execute(Target dst, int dstIndex, Target src, int srcIndex, Status status) {
int count = src.get(srcIndex) % 16;
int destination = dst.get(dstIndex);
if (count == 1) {
status.setOverflowFlag(false); //sign doesn't change
}
if ((destination & 0x8000) == 0x8000) {
destination |= 0xFFFF0000;
}
destination = destination >> (count - 1);
status.setCarryFlag((destination & 1) == 1);
destination = destination >> 1;
status.setZeroFlag(destination == 0);
dst.set(dstIndex, destination);
return status;
}
@Override
public Status execute(Target dst, int dstIndex, int src, Status status) {
int count = src % 16;
int destination = dst.get(dstIndex);
if (count == 1) {
status.setOverflowFlag(false); //sign doesn't change
}
if ((destination & 0x8000) == 0x8000) {
destination |= 0xFFFF0000;
}
destination = destination >> (count - 1);
status.setCarryFlag((destination & 1) == 1);
destination = destination >> 1;
status.setZeroFlag(destination == 0);
dst.set(dstIndex, destination);
return status;
}
}