public static unsafe uint Add(uint *location, uint value)
{
Asm.MOV(R32.EDX, &value);
Asm.LOCK();
Asm.ADD(location, R32.EDX);
return(*location);
}
public static unsafe void MemCopy(uint src, uint dst, uint count)
{
Asm.CLD();
Asm.MOV(R32.ECX, &count);
Asm.MOV(R32.ESI, &src);
Asm.MOV(R32.EDI, &dst);
Asm.CMP(R32.ESI, R32.EDI);
Asm.JA("FMove8");
Asm.STD();
Asm.ADD(R32.ESI, R32.ECX);
Asm.ADD(R32.EDI, R32.ECX);
Asm.LABEL("BMove8");
Asm.SHR(R32.ECX, 1); // divide count by 2 (8bit -> 16bit blocks)
Asm.JNC("BMove16"); // if carry flag has not been set, skip next instruction
Asm.MOVSB(); // move a byte (8bit) first
Asm.LABEL("BMove16");
Asm.SHR(R32.ECX, 1); // divide count by 2 (16bit -> 32bit blocks)
Asm.JNC("BMove32"); // if carry flag has not been set, skip next instruction
Asm.MOVSW(); // move short (16bit) first
Asm.LABEL("BMove32");
Asm.INC(R32.ECX);
Asm.REP();
Asm.MOVSD(); // move everything else in 32bit blocks
Asm.JMP("EndMove");
Asm.LABEL("FMove8");
Asm.SHR(R32.ECX, 1); // divide count by 2 (8bit -> 16bit blocks)
Asm.JNC("FMove16"); // if carry flag has not been set, skip next instruction
Asm.MOVSB(); // move a byte (8bit) first
Asm.LABEL("FMove16");
Asm.SHR(R32.ECX, 1); // divide count by 2 (16bit -> 32bit blocks)
Asm.JNC("FMove32"); // if carry flag has not been set, skip next instruction
Asm.MOVSW(); // move short (16bit) first
Asm.LABEL("FMove32");
Asm.REP();
Asm.MOVSD(); // move everything else in 32bit blocks
Asm.LABEL("EndMove");
}
