private bool patchtestreg(int node, int reg)
{
int i = getjumpcontrol(node);
int[] code = f.code_Renamed;
int instr = code[i];
if (Lua.OPCODE(instr) != Lua.OP_TESTSET)
{
return(false); // cannot patch other instructions
}
if (reg != Lua.NO_REG && reg != Lua.ARGB(instr))
{
code[i] = Lua.SETARG_A(instr, reg);
}
else // no register to put value or register already has the value
{
code[i] = Lua.CREATE_ABC(Lua.OP_TEST, Lua.ARGB(instr), 0, Lua.ARGC(instr));
}
return(true);
}