/*
JPC: An x86 PC Hardware Emulator for a pure Java Virtual Machine
Copyright (C) 2012-2013 Ian Preston
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as published by
the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Details (including contact information) can be found at:
jpc.sourceforge.net
or the developer website
sourceforge.net/projects/jpc/
End of licence header
*/
package org.jpc.emulator.execution.opcodes.pm;
import org.jpc.emulator.execution.*;
import org.jpc.emulator.execution.decoder.*;
import org.jpc.emulator.processor.*;
import org.jpc.emulator.processor.fpu64.*;
import static org.jpc.emulator.processor.Processor.*;
public class fucompp_ST4 extends Executable
{
public fucompp_ST4(int blockStart, int eip, int prefices, PeekableInputStream input)
{
super(blockStart, eip);
int modrm = input.readU8();
}
public Branch execute(Processor cpu)
{
int newcode = 0xd;
double freg0 = cpu.fpu.ST(0);
double freg1 = cpu.fpu.ST(4);
if (!(Double.isNaN(freg0) || Double.isNaN(freg1)))
{
if (freg0 > freg1) newcode = 0;
else if (freg0 < freg1) newcode = 1;
else newcode = 8;
}
cpu.fpu.conditionCode &= 2;
cpu.fpu.conditionCode |= newcode;
cpu.fpu.pop();
cpu.fpu.pop();
return Branch.None;
}
public boolean isBranch()
{
return false;
}
public String toString()
{
return this.getClass().getName();
}
}